• Go Direct SpectroVis Plus
• 15 plastic cuvettes and lids
• Rechargeable battery (included inside unit; remove if data collection is strictly via USB)
• Mini USB Cable
• Power supply (for battery recharge only; do not plug in if taking data)

Choose a platform below to see its compatibility requirements.

LabQuest

Interface	LabQuest App
LabQuest 3	Full support 1
LabQuest 2 (discontinued)	Full support 1
LabQuest (discontinued)	Full support 1

Compatibility Notes

1. Connect this sensor via USB. Wireless data collection is not supported.

Computers

	Software
Interface	Spectral Analysis for Computers	Graphical Analysis App for Computers	Logger Pro
No interface required	Full support 1 2	Incompatible	Full support 3
LabQuest 3	Incompatible	Full support 4	Incompatible
LabQuest 2 (discontinued)	Incompatible	Full support 4	Incompatible

Compatibility Notes

1. For Bluetooth^® connectivity, only computers running Windows 10 or Mac OS X 10.10 or newer are supported. The computer must also have a compatible Bluetooth 4.0⁺ radio.
2. Some older Go Direct SpectroVis Plus units require a free firmware update to work via a wireless Bluetooth^® connection.
3. Connect this sensor via USB. Wireless data collection is not supported.
4. Connect this sensor directly to a computer or Chromebook via a USB or wireless Bluetooth^® connection and use with Spectral Analysis App for best results. Alternatively, this sensor is fully supported when used via USB with LabQuest 2 or LabQuest 3 when the LabQuest is connected to a computer or Chromebook via Wireless Data Sharing.

Chromebook

	Software
Interface	Spectral Analysis for Chrome	Graphical Analysis App for Chrome
No interface required	Full support 1	Incompatible
LabQuest 3	Incompatible	Full support 2
LabQuest 2 (discontinued)	Incompatible	Full support 2

Compatibility Notes

1. Some older Go Direct SpectroVis Plus units require a free firmware update to work via a wireless Bluetooth^® connection.
2. Connect this sensor directly to a computer or Chromebook via a USB or wireless Bluetooth^® connection and use with Spectral Analysis App for best results. Alternatively, this sensor is fully supported when used via USB with LabQuest 2 or LabQuest 3 when the LabQuest is connected to a computer or Chromebook via Wireless Data Sharing.

Android

	Software
Interface	Spectral Analysis for Android	Graphical Analysis App for Android	Graphical Analysis GW for Android
No interface required	Full support 1	Incompatible	Incompatible
LabQuest 3	Incompatible	Full support 2 3	Full support 2 3
LabQuest 2 (discontinued)	Incompatible	Full support 2 3	Full support 2 3

Compatibility Notes

1. Some older Go Direct SpectroVis Plus units require a free firmware update to work via a wireless Bluetooth^® connection.
2. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
3. Connect this sensor directly to an iOS or Android™ device via wireless Bluetooth^® connection and use with Spectral Analysis App for best results. Alternatively, this sensor is fully supported when used via USB with LabQuest 2 or LabQuest 3 when the LabQuest is connected to an iOS or Android device via Wireless Data Sharing.

iOS

	Software
Interface	Spectral Analysis for iOS	Graphical Analysis App for iOS	Graphical Analysis GW for iOS
No interface required	Full support 1	Incompatible	Incompatible
LabQuest 3	Incompatible	Full support 2 3	Full support 2 3
LabQuest 2 (discontinued)	Incompatible	Full support 2 3	Full support 2 3

Compatibility Notes

1. Some older Go Direct SpectroVis Plus units require a free firmware update to work via a wireless Bluetooth^® connection.
2. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
3. Connect this sensor directly to an iOS or Android™ device via wireless Bluetooth^® connection and use with Spectral Analysis App for best results. Alternatively, this sensor is fully supported when used via USB with LabQuest 2 or LabQuest 3 when the LabQuest is connected to an iOS or Android device via Wireless Data Sharing.

Please see the following link for platform-specific connection information:

www.vernier.com/start/gdx-svispl

Bluetooth Connection

USB Connection

Install Vernier Spectral Analysis® on your computer, Chromebook™, or mobile device. See www.vernier.com/spectral-analysis for Spectral Analysis availability. Charge your spectrometer for at least eight hours before first use using the included power supply. Disconnect the power supply before attempting to collect data. It is recommended that you not have the power supply attached while collecting data wirelessly. Turn on the spectrometer by pressing the power button once. The Bluetooth® LED will blink. Launch Spectral Analysis. Click or tap Connect a Spectrometer. Select your Go Direct SpectroVis Plus from the list of Discovered Wireless Devices. Your spectrometer's ID is located near the barcode on the label. The Bluetooth LED on the sensor will now glow blue (no longer flashing). Click or tap Done to enter data-collection mode. You are now ready to continue your experiment.

Do not connect the power supply. You do not need it when taking data via USB. Note: If collecting data via USB, it is suggested you remove the battery from the spectrometer. Connect the spectrometer to the USB port. Launch the software. Options include Computer: Spectral Analysis or Logger Pro 3 Chromebook: Spectral Analysis LabQuest: LabQuest App Mobile Device: Spectral Analysis The software will identify the spectrometer and enter data-collection mode. You are now ready to continue your experiment.   Note: This sensor does not work with the original LabQuest. It works via USB with LabQuest 2 or LabQuest 3.

Connect Go Direct SpectroVis Plus to the included AC power cable for at least eight hours. Note: This is only required for data collection via Bluetooth wireless technology.

Charging	Orange LED next to battery icon is solid while sensor is charging.
Fully charged	Green LED next to battery icon is solid when sensor is fully charged.

Turning on the sensor	Press Power button once or connect to USB. Green LED indicator next to Power icon is solid when unit is on.
Putting the sensor in sleep mode	Press and hold button for more than three seconds to put into sleep mode. Green LED indicator turns off when sleeping.

See the following link for up-to-date connection information:

www.vernier.com/start/gdx-svispl

Connecting via Bluetooth

Ready to connect	Press Power button once. Blue LED next to Bluetooth icon flashes when sensor is ready to connect.
Connected	Blue LED next to Bluetooth icon is solid when sensor is connected via Bluetooth wireless technology.

Connecting via USB

Connected and charging	Orange LED next to battery icon is solid when sensor is connected to Spectral Analysis via USB. LED next to Bluetooth icon is off. LED next to power is solid green. LED next to USB icon is solid green.
Connected, fully charged	LED next to battery icon is off when sensor is connected to Spectral Analysis via USB and fully charged. LED next to Bluetooth icon is off.
Charging via USB, connected via Bluetooth	This combination is not permitted.
Charging via AC power, connected via Bluetooth	This combination is not recommended.

Connect the sensor following the steps in the Getting Started section of this user manual.

Select the Type of Data to Measure

The three options for Experiment Types are:

1. Measurement vs. Wavelength—collect a full spectrum.
2. Measurement vs. Concentration—conduct a Beer's law experiment.
3. Measurement vs. Time—collect time-based data for a kinetics experiment.

By default, Absorbance is expanded. You can also choose from % Transmittance, Fluorescence, Emissions, or Advanced Full Spectrum. Use the Advanced Full Spectrum mode to switch between all the measurement types in the same session. For complete instructions, refer to the Spectral Analysis user manual at www.vernier.com/spectral-analysis

Measurement vs. Wavelength (Full Spectrum)

1. Select Measurement vs. Wavelength.
2. If applicable, follow instructions for calibration. Align the cuvette so the clear side of the cuvette is facing the light source. Note: Calibration is not required for fluorescence or intensity.
3. You are now ready to collect data. Fill a cuvette about 3/4 full of a sample of the solution to be tested. Place the sample in the Spectrophotometer and click Collect. Click Stop to end data collection. The spectrum is automatically stored.
4. Save or export your data from the File menu.

Measurement vs. Concentration (Beer's law)

1. Select Measurement vs. Concentration.
2. If applicable, follow instructions for calibration. Align the cuvette so the clear side of the cuvette is facing the light source. Note: Calibration is not required for fluorescence or intensity.
3. Follow the instructions in the Choose a Wavelength dialog box. Select Done.
4. Click Collect. Your first sample should still be in the Spectrophotometer. After the reading stabilizes, click Keep. Enter the concentration of the sample and click or tap Keep Point.
5. Place your second sample in the cuvette slot. After the reading stabilizes, click Keep. Enter the concentration of the sample and click or tap Keep Point.
6. Repeat the previous step for the remaining samples. When finished, click Stop to end data collection. The data is automatically stored.
7. To see the best fit line equation for the standard solutions, click Graph Tools, select Apply Curve Fit, and choose Linear. Click or tap Apply.
8. If doing Beer's law to determine the concentration of an unknown, place the unknown sample in the cuvette holder. Click or tap Graph Tools and enable Interpolate. Click or tap along the line until you find the concentration value that matches your unknown's measurement.
9. Save or export your data from the File menu.

Measurement vs. Time (Kinetics)

1. Select Measurement vs. Time.
2. If applicable, follow instructions for calibration. Align the cuvette so the clear side of the cuvette is facing the light source. Note: Calibration is not required for fluorescence or intensity.
3. Follow the instructions in the Choose a Wavelength dialog box. Select Done.
4. The default data-collection settings collect measurements every two seconds until the user manually stops data collection.
5. Mix the reactants. Transfer ~2 mL of the reaction mixture to a cuvette and place the cuvette in the spectrometer. Click or tap Collect.
6. When finished, click or tap Stop.
7. To fit a function to the data, click Graph Tools, select Apply Curve Fit, and choose the appropriate curve fit. Click or tap Apply.
8. To add a calculated column to the data set, click OK in the measurement header on the data table. Select Add Calculated Column. Modify the name, units, and displayed precision accordingly. Select Insert Expression and select the appropriate equation. Modify the parameters and column options, if necessary. Click or tap Apply. The calculated column is automatically displayed on the graph.
9. Save or export your data from the File menu.

Change the Settings in Spectral Analysis

1. Click or tap the gear to show the Spectrometer Settings dialog.
2. There are three parameters listed in the dialog box:
   • Integration Time: This is similar to the shutter speed of a camera. Spectral Analysis automatically selects the proper sample time during calibration in Absorbance and % Transmittance modes. If using Fluorescence, Intensity, or Advanced Experiment modes, you can modify this value to increase the amount of light hitting the detector and the signal spectral output.
   • Wavelength Smoothing: This is the number of adjacent readings on either side of a given value that is used to calculate an average value.
   • Temporal Averaging: This is the number of readings taken at a given wavelength to calculate an average reading.

3. Select the Calibrate button to recalibrate your spectrometer at any time.

Measure an Emission Spectrum with Spectral Analysis

You may use your Spectrophotometer to measure the emission spectrum of a light source such as an LED or a gas discharge tube. To do so, you will need to purchase the Vernier Optical Fiber (order code: VSP-FIBER).

Measure Intensity of Light Emissions

Insert the Vernier Optical Fiber into the SpectroVis Plus.

1. Connect the sensor following the steps in the Getting Started section of this user manual.
2. Open Spectral Analysis.
3. Select the appropriate Emissions experiment from the listed options and follow the prompts in the app. Intensity is a relative measure with a range of 0–1. Note: The Spectrophotometer is not calibrated for measuring intensity.
4. Aim the tip of the optical fiber at a light source. Start data collection. Tap the Stop button to end data collection.

If the spectrum maxes out (flat and wide peaks at a value of 1), increase the distance between the light source and the tip of the optical fiber cable or reduce the integration time (see the Change the Settings in Spectral Analysis section).

To adjust the integration time, click or tap the gear. Set the integration time to a suitable value.

Measure Fluorescence with Spectral Analysis

You may use your Spectrophotometer to measure the fluorescence spectrum of an aqueous sample, such as chlorophyll, riboflavin, and fluorescein. Fluorescence is the emission of light by a compound after it has absorbed a particular wavelength of light. Under most circumstances, the emission of light will occur at a longer wavelength than the light used to excite it. The SpectroVis Plus has two excitation wavelengths: one at 405 nm and one at 500 nm.

There are three general types of data collection that measure fluorescence— fluorescence vs. wavelength, which produces a spectrum, fluorescence vs. concentration, and fluorescence vs. time for kinetics experiments. To collect these types of data after the experiment type has been selected as Fluorescence, follow the instructions in the Spectral Analysis user manual at www.vernier.com/spectral-analysis. Note: You may need to change the integration time to get accurate peak intensities in fluorescence mode. To adjust the integration time click or tap on the gear. Set the integration time to a suitable value.

Connect the sensor following the steps in the Getting Started section of this user manual.

Select the Type of Data (or Units) You Want to Measure

The default data type is absorbance. If you want to measure the absorbance of a solution, proceed directly to the Calibrate the Spectrophotometer section.

If you want to measure %T, fluorescence (excited at 405 nm or 500 nm), or intensity, do the following:

1. From the Sensors menu, choose Change Units ► USB: Spectrophotometer.
2. Select the unit or data type you wish to measure.

Calibrate the Spectrophotometer (Not Required if Measuring Intensity or Fluorescence)

1. Choose Calibrate ► USB: Spectrophotometer from the Sensors menu. Note: For best results, allow the Spectrophotometer to warm up for a minimum of five minutes.
2. Fill a cuvette about 3/4 full with distilled water (or the solvent being used in the experiment) to serve as the blank. After the Spectrophotometer has warmed up, place the blank cuvette in the Spectrophotometer. Align the cuvette so a clear side of the cuvette is facing the light source.
3. Follow the instructions in the dialog box to complete the calibration, and then tap OK.

Collect Data with LabQuest

Measurement vs. Wavelength (Full Spectrum)

1. Fill a cuvette about 3/4 full of the solution to be tested and place it in the Spectrophotometer.
2. Start data collection by tapping on the Start button in the lower left corner of the screen. Tap the Stop button to end data collection.
3. Tap on the graph to select a wavelength. Note the wavelength you may want to use for a future Beer's law or kinetics experiment.
4. To store the spectrum data, tap on the file cabinet icon in the upper right of your screen.

Measurement vs. Concentration (Beer’s Law)

1. Generate a spectrum as described above. On the Meter screen, tap Mode. Change the mode to Events with Entry.
2. Enter the Name (e.g., Concentration) and Units (e.g., mol/L). Select OK.
3. A message will appear warning you to either save or discard the full spectrum run. Make your choice and proceed with data collection.
4. Set the wavelength for data collection. On the Meter screen, tap on the meter, and select Change Wavelength. Enter the wavelength of your choice and select OK. If the wavelength you type in is not measured by the unit, LabQuest will automatically choose the wavelength closest to your choice.
5. Place your first Beer’s law standard solution in the Spectrophotometer. Start data collection. After the absorbance reading stabilizes, tap Keep. Enter the concentration of the solution and select OK.
6. Place your second standard sample in the Spectrophotometer. After the absorbance readings stabilize, tap Keep. Enter the concentration of the second sample and select OK.
7. Repeat Step 5 for the remaining standard samples. After you have tested the final standard, tap the Stop button to end data collection.
8. To calculate a best fit line equation for your standards, choose Curve Fit from the Analyze menu. Select Linear for the Fit Equation, and then select OK. The graph screen will appear again with the linear regression equation displayed.
9. Place a cuvette containing an unknown sample of solution in the Spectrophotometer. Tap the Meter tab and write down the displayed absorbance value. Tap the Graph tab and choose Interpolate from the Analyze menu. Trace the linear regression equation to determine the concentration of the unknown.

Measurement vs. Time (Kinetics)

1. Generate a spectrum as described above. On the Meter screen, tap Mode. Change the data-collection mode to Time Based.
2. You can change the rate, interval, and/or duration of time of data collection, if desired. Select OK when you are ready to proceed.
3. A message will appear warning you to either save or discard the full spectrum run. Make your choice and proceed with data collection.
4. Set the wavelength for data collection. On the Meter screen, tap on the meter, and select Change Wavelength. Enter the wavelength of your choice and select OK. If the wavelength you type in is not measured by the unit, LabQuest will automatically choose the wavelength closest to your choice.
5. Mix the reactants, transfer ~2 mL of the reaction mixture to a cuvette, and place the cuvette in the Spectrophotometer. Start data collection. You may tap the Stop button to end data collection early.
6. To calculate a function for your data, choose Curve Fit from the Analyze menu. Select the Fit Equation, and then select OK. The graph screen will appear again.

Measure an Emission Spectrum with LabQuest

You may use your Spectrophotometer to measure the emission spectrum of a light source such as an LED or a gas discharge tube. To do so, you will need to purchase the Vernier Optical Fiber (order code: VSP-FIBER).

Measure Intensity of Light Emissions

1. Insert the Vernier Optical Fiber into the SpectroVis Plus.
2. Use a USB cable to connect the Spectrophotometer to your LabQuest.
3. Choose New from the File menu.
4. On the Meter screen, tap Change Units ► USB: Spectrophotometer ► Intensity from the Sensors menu. Intensity is a relative measure with a range of 0–1. Note: The Spectrophotometer is not calibrated for measuring intensity.
5. Aim the tip of the optical fiber at a light source. Start data collection. Tap the Stop button to end data collection.

If the spectrum maxes out (flat and wide peaks at a value of 1), increase the distance between the light source and the tip of the optical fiber cable or reduce the sample time (see the Change the Settings in LabQuest section).

To adjust the sample time, tap on Mode from the Meter screen. Set the Sample Time to a suitable value.

Measure Fluorescence with LabQuest

You may use your Spectrophotometer to measure the fluorescence spectrum of an aqueous sample, such as chlorophyll, riboflavin, and fluorescein. Fluorescence is the emission of light by a compound after it has absorbed a particular wavelength of light. Under most circumstances, the emission of light will occur at a longer wavelength than the light used to excite it. The SpectroVis Plus has two excitation wavelengths: one at 405 nm and one at 500 nm.

There are three general types of data collection that measure fluorescence— fluorescence vs. wavelength, which produces a spectrum, fluorescence vs. concentration, and fluorescence vs. time for kinetics experiments. Once the units have been changed to Fluorescence from the Sensors menu, follow the instructions in the Collect Data with LabQuest section of this user manual to collect these types of data. Note: You may need to change the sample time to get accurate peak intensities in fluorescence mode. To adjust the sample time, tap on Mode from the Meter screen. Set the Sample Time to a suitable value.

Change the Settings in LabQuest

Data Collection Screen

The Data Collection Screen in LabQuest lists all the settings for the device. To display this box, choose Sensors ► Data Collection from the Meter screen.

For most experiments, the default settings work well.

There are four parameters listed in the dialog box.

• Sample Time: This is similar to the shutter speed of a camera. LabQuest automatically selects the proper sample time during calibration. Note: For emission studies, you may need to change the sample time manually.
• Wavelength Smoothing: This is the number of adjacent readings on either side of a given value that is used to calculate an average value. Note: Be careful adjusting this parameter as it may shift your wavelength values slightly.
• Samples to Average: This is the number of readings taken at a given wavelength to calculate an average reading.
• Wavelength Range: The range is determined by the type of Spectrophotometer in use.

Consider using Spectral Analysis, the free app dedicated to spectroscopy. To proceed with Logger Pro, connect the sensor following the steps in the Getting Started section of this user manual.

Select the Type of Data (or Units) You Want to Measure

The default data type is absorbance. If you want to measure the absorbance of a solution, proceed directly to the Calibrate section below.

If you want to measure %T, fluorescence (excited at 405 nm or 500 nm), or intensity, do the following:

1. Choose Change Units ► Spectrophotometer from the Experiment menu.
2. Select the unit or data type you wish to measure.

Calibrate (Not Required if Measuring Intensity or Fluorescence)

1. To calibrate Go Direct SpectroVis Plus, choose Calibrate ► Spectrophotometer from the Experiment menu. Note: For best results, allow the Spectrophotometer to warm up for a minimum of five minutes.
2. Fill a cuvette about 3/4 full with distilled water (or the solvent being used in the experiment) to serve as the blank. After the Spectrophotometer has warmed up, place the blank cuvette in the Spectrophotometer. Align the cuvette so the clear side of the cuvette is facing the light source.
3. Follow the instructions in the dialog box to complete the calibration, and then click .

Collect Data with Logger Pro

There are three general types of data collection that measure absorbance or transmittance—absorbance (or %T) vs. wavelength, which produces a spectrum, absorbance (or %T) vs. concentration for Beer’s law experiments, and absorbance (or %T) vs. time for kinetics experiments.

Measurement vs. Wavelength (Full Spectrum)

1. Fill a cuvette about 3/4 full of a sample of the solution to be tested. Place the sample in the Spectrophotometer and click . Click to end data collection.
2. To store the spectrum data, choose Store Latest Run from the Experiment menu.

Measurement vs. Concentration (Beer’s Law)

1. Generate a spectrum as described above.
2. Click the Configure Spectrophotometer Data Collection button, .

There are three regions in this box:

• Collection Mode: The three options for data collection are offered. If the measurement (Absorbance in this example) vs. Time or vs. Concentration is selected, a wavelength or wavelengths will need to be chosen.
• Graph: The graph displays a full-spectrum analysis of the sample in the cuvette holder. By default, the wavelength with the maximum measured value will be selected. You may wish to select a different wavelength. See Step 3 for details.
• List of Wavelength Options: This column lists all the available wavelengths. It becomes active when either the Concentration or Time mode is selected.

 

3. Select Absorbance (or %T) vs. Concentration as the data-collection mode. The wavelength with the maximum value from the spectrum (λ max) will be automatically selected. There are three options when choosing a wavelength (or wavelengths) for subsequent measurements.
   • Option 1: The default option is to use a single 10 nm band. This measures the average absorbance from ~5 nm on either side of the chosen wavelength. You can change the center wavelength value by clicking on the graph or by choosing a wavelength from the list.
   • Option 2: If you wish to use the λ max chosen by Logger Pro, but you want the absorbance to be measured only at that one wavelength, change Single 10 nm Band to Individual Wavelengths. You may then select up to ten wavelengths to measure at the same time.
   • Option 3: If you wish to measure an average over a range of contiguous wavelengths of your choice, change Single 10 nm Band to Individual Wavelengths. Click . Select boxes in the list or drag your cursor on the graph to select up to ten contiguous wavelengths. Check Combine Contiguous Wavelengths.
4. Click to continue.
5. Click . Place your first sample in the cuvette slot of the Spectrophotometer. After the readings stabilize, click . Enter the concentration of the sample and click .
6. Place your second sample in the cuvette slot. After the readings stabilize, click . Enter the concentration of the second sample and click .
7. Repeat Step 6 for the remaining samples. When finished, click to end data collection.
8. Click Linear Fit, , to see the best fit line equation for the standard solutions.
9. If doing Beer’s law to determine the concentration of an unknown, place the unknown sample in the cuvette holder. Choose Interpolation Calculator from the Analyze menu. A helper box will appear, displaying the absorbance and concentration of the unknown. Click .

Measurement vs. Time (Kinetics)

1. Generate a spectrum as described above.
2. Click the Configure Spectrophotometer Data Collection button, .
3. Select Absorbance vs. Time as the data-collection mode. The wavelength of maximum absorbance will be selected. Click to continue or click and select a wavelength on the graph or in the list of wavelengths. See the previous section for more details.
4. The default settings are 1 sample per second for 200 seconds. To change the data-collection parameters for your experiment, choose Data Collection from the Experiment menu and make the necessary changes. Click .
5. Mix the reactants. Transfer ~2 mL of the reaction mixture to a cuvette and place the cuvette in the Spectrophotometer. Click . Click if you wish to end data collection early.
6. Click Curve Fit, , to calculate a function for your data.

Measure Emission Spectra with Logger Pro 3

You may use your Spectrophotometer to measure the emission spectrum of a light source such as an LED or a gas discharge tube. To do so, you will need to purchase the Vernier Optical Fiber (order code: VSP-FIBER). Note: For best results observing emission spectra, consider the Vernier Emission Spectrometer (order code: VSP-EM).

Measure Intensity of Light Emissions

1. Insert the Vernier Optical Fiber into Go Direct SpectroVis Plus.
2. Choose Change Units ► Spectrophotometer ► Intensity from the Experiment menu. Intensity is a relative measure with a range of 0–1. Note: The Spectrophotometer is not calibrated for measuring intensity.
3. Aim the tip of the optical fiber cable at a light source. Click . Click to end data collection.

If the spectrum maxes out (flat and wide peaks at a value of 1), increase the distance between the light source and the tip of the optical fiber cable or reduce the sample time (see Change the Settings in Logger Pro).

To adjust the sample time, choose Set Up Sensors ► Spectrophotometer: 1 from the Experiment menu. Set the Sample Time to a suitable value. This value can be adjusted during data collection.

Use the Stored Emissions Files in Logger Pro

Logger Pro contains a folder of emissions graphs from selected discharge tubes, including argon, helium, hydrogen, mercury, oxygen, sodium, and xenon. You can display and analyze these graphs without a spectrometer connected to your computer. Follow these steps to view one of these graphs.

1. Choose Open from the File menu.
2. Open the Sample Data folder.
3. Inside the Sample Data folder, open the Physics folder.
4. Inside the Physics folder, open the Gas Discharge Spectra. Open the desired file.

You can use the mercury emissions graph to test fluorescent lighting for the presence of mercury.

Measure Fluorescence with Logger Pro

You may use your Spectrophotometer to measure the fluorescence spectrum of an aqueous sample, such as chlorophyll, riboflavin, and fluorescein. Fluorescence is the emission of light by a compound after it has absorbed a particular wavelength of light. Under most circumstances, the emission of light will occur at a longer wavelength than the light used to excite it. Go Direct SpectroVis Plus has two excitation wavelengths, one at 405 nm and one at 500 nm.

There are three general types of data collection that measure fluorescence— fluorescence vs. wavelength, which produces a spectrum, fluorescence vs. concentration, and fluorescence vs. time for kinetics experiments. Once the units have been changed to Fluorescence from the Experiment menu, follow the instructions in the Collect Data with Logger Pro section of this user manual to collect these types of data. Note: You may need to change the sample time to get accurate peak intensities in fluorescence mode. To adjust the sample time, choose Set Up Sensors ► Spectrophotometer: 1 from the Experiment menu. Set the Sample Time to a suitable value. This value can be adjusted during data collection.

Change the Settings in Logger Pro

Spectrophotometer Dialog Box

The Spectrophotometer dialog box lists all the settings for the device. To display this box, choose Set Up Sensors ► Spectrophotometer from the Experiment menu.

 

For most experiments, the default settings work well.

There are four parameters listed in the dialog box.

• Sample Time: This is similar to the shutter speed of a camera. Logger Pro automatically selects the proper sample time during calibration. Note: For emission studies, you may need to change the sample time manually.
• Wavelength Smoothing: This is the number of adjacent readings on either side of a given value that is used to calculate an average value. Note: Be careful adjusting this parameter as it may shift your wavelength values slightly.
• Samples to Average: This is the number of readings taken at a given wavelength to calculate an average reading.
• Wavelength Range: The range is determined by the type of Spectrophotometer in use.

By clicking on the picture of the Spectrophotometer in this dialog box, you will gain access to four options: calibrate, configure data collection, go to the support website, and current connection. Click on an item to select it.

Light source	Incandescent with LED support
Detector	Linear CCD
Wavelength range	380 nm–950 nm
Wavelength reporting interval	~1 nm
Optical resolution (FWHM)	5.0 nm
Wavelength accuracy	± 4.0 nm
Photometric accuracy	±0.10 A.U.
Typical scan time	~2 s
Operating temperature	15–35ºC
Battery	High-capacity, lithium-ion rechargeable battery
USB specification	2.0 full speed
Wireless specification	Bluetooth® v4.2
Dimensions	15 cm × 9 cm × 4 cm
Support for fluorescence	Excitation centered at 405 and 500 nm

• When this instrument is in data-collection mode labeled Intensity, the light source will be blocked or turned off. Continue to use proper safety precautions.
• Do not remove or modify any of the installed safety components of this device. Doing so will create an unsafe operating condition and will void the product warranty.
• No user-serviceable parts are in this device. Do not attempt to open or modify this device. Contact Vernier for all repairs and service including lamp replacement.
• Handle the device with care. This instrument can be damaged if it is dropped.
• Do not use this instrument if it is damaged in any way. Contact Vernier Technical Support for troubleshooting and technical assistance.
• Do not use this instrument for clinical or diagnostic procedures.

For troubleshooting tips, see www.vernier.com/til/3847

• The light source in Go Direct SpectroVis Plus is an incandescent lamp. The lifetime of this source is rated at approximately 8,000 hours.
• The lamp is covered by a three-year warranty.
• Contact Vernier for all repairs and service including lamp replacement.
• No user-serviceable parts are in this device. Do not attempt to open the case of the device. Do not attempt to change or repair the lamp. Doing so will create an unsafe operating condition and will void the product warranty.

If you have watched the related product video(s), followed the troubleshooting steps, and are still having trouble with your Go Direct SpectroVis Plus, contact Vernier Technical Support at support@vernier.com or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.

Item	Order Code
Cuvette Rack	CUV-RACK
Plastic Cuvettes (Visible Range)	CUV
Vernier Spectrophotometer Optical Fiber	VSP-FIBER
Replacement Battery for LabQuest® 2 and LabQuest Stream®	LQ2-BAT
LabQuest Power Supply	LQ-PS
Vernier Mini USB Cable	CB-USB-MINI
Vernier Mini USB-C Cable	CB-USB-C-MINI

Warranty information for this product can be found on the Support tab at www.vernier.com/gdx-svispl/#support

General warranty information can be found at www.vernier.com/warranty

When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.

Battery recycling information is available at www.call2recycle.org

Do not puncture or expose the battery to excessive heat or flame.

The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.