Differential Voltage Probe (DVP-BTA)
Primary Test: Are the leads properly and securely connected? The probe is designed to be used like voltmeter leads. It should be placed across a circuit element.
Secondary Test: When measuring DC voltages with power supplies, some power supplies do not provide a steady DC signal. If the sensor voltage is fluctuating, try a DC source such as a battery. If the sensor reading is correct, the problem may be the power supply.
Third test: Is the output appropriate? The differential input range is −6 volts to +6 volts. Over-voltage protection is provided so that slightly higher voltages will not damage the sensor. You should NEVER use high voltages or household AC with these probes.
-Order code: DVP-BTA
-Input voltage range: ± 6.0V
-Maximum voltage on any input: ±10 V
-Input impedance (to ground): 10 MΩ
-Differential impedance : >20 MΩ
-Resolution, 12-bit (LabQuest – any model, LabPro, ULI II, SBI): 3.1 mV
-Resolution, 10-bit (ULI, CBL, CBL 2): 12.5 mV
-Supply voltage: 5 VDC
-Supply current (typical): 9 mA
-Output voltage range: 0 – 5 V
-Transfer function: Vo = -0.4 (V+ – V-) + 2.5
-Calibrate? No. The sensor is set to the stored calibration before shipping. If you wish to calibrate the sensor, you will conduct a two-point calibration. Refer to the sensor booklet, page 3, for detailed instructions. You may also zero the sensor before collecting data, as an alternative to calibration. This is done by shorting out the leads of the sensor, then choosing the Zero option in the data-collection software. This option adjusts the calibration offset but does not adjust the calibration gain.