Digital Radiation Monitor (DRM-BTD, discontinued)
Specifications and User Guide
Extended User Manual: https://www.vernier.com/files/manuals/drm-btd_2.pdf

TROUBLESHOOTING
– Primary Test:
Turn on the Digital Radiation Monitor to audio position, and set the upper switch to CPM. Does the screen settle to a fluctuating small number (~0-20 cpm)? It should not always be zero, but might sometimes read zero.

Connect cable to Digital Radiation Monitor and a LabQuest interface (any model). Does the software recognize the Digital Radiation Monitor? Does the meter count increment?

– Secondary Test:
Set LabQuest App for time-based data collection (60 s count interval, 6000 seconds) and collect data. The time series should be random, neither increasing nor decreasing. FFT should be Gaussian.

RELATED TIL ENTRIES
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Data Collection
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My Digital Radiation Monitor won't produce count rates over 500 cpm.


My Digital Radiation Monitor occasionally reads counts that are unreasonably high.
Why doesn't the meter on the front of the Digital Radiation Monitor more closely match the software?
Can I use my Radiation Monitor with TI calculators?

Hardware Compatibility
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Legacy Products
Radiation Monitor Troubleshooting and FAQs
Student Radiation Monitor Troubleshooting and FAQs

SPECIFICATIONS
– order code: DRM-BTD
– Sensor: LND 712 (or equivalent) halogen-quenched GM tube with a mica end window, 1.5 to 2.0 mg/cm2 thick, rated at 1000 counts per minute using a Cesium-137 laboratory standard.
– Power: One 9-volt alkaline battery provides a battery life of 2000 hours at normal background radiation levels.
– Accuracy: ±10% typical, ±15% max. (mR/hr and µSv/hr modes)
– Dimensions: 150 x 80 x 30 mm (5.9″ x 3.2″ x 1.2″)
– Weight: 225 g (8 oz) with battery installed
– Energy sensitivity: 1000 CPM/mR/hr referenced to Cs-137
– Audio output: Chirps for each count (operational in audio mode only–can be muted)
– Temperature range: –20°C to 50°C
– Operating range:
mR/hr: 0.001 to 110
CPM: 0 to 350,000
Total: 1 to 9,999,000 counts
µSv/hr: 0.01 to 1100
CPS: 1 to 3,500

CALIBRATION
– Calibrate? No.
It is calibrated for Cesium-137, but also serves as an excellent indicator of relative intensities for other sources of ionizing radiation. The Radiation Monitor does not detect neutron, microwave, radio frequency (RF), laser, infrared, or ultraviolet radiation.