Geiger Counter Expansion Modules
DMAD Digital Meter Adapter
Add a digital display to your analog Geiger counter.
Three Digital Functions
- Counts Per Second (CPS) and Counts Per Minute (CPM)
- Radiation level readings
- Random number generator
The DMAD is an expansion module for compatible analog Geiger counters. It connects to counters that output a TTL pulse for every radioactive particle detected.
A backlit 16-character × 2-line LCD provides an easy-to-read output. Available as a kit or assembled and tested.
Kit $65.95 · Assembled $95.95
Pulse Counting & Radiation Readout
The DMAD counts pulses from an analog Geiger counter and displays CPS or CPM. It converts the count reading into an equivalent radiation level, with both count data and radiation level shown on the LCD.
- Countable pulse resolution & range
- 1 CPM–9,360 CPS
- Radiation resolution & range
- 1.0 µR/hr–655 mR/hr
- Metric radiation range
- 0.01 µSv/hr–6.5 mSv/hr
Compatibility: Requires an analog Geiger counter with pulse output, such as GCK-01, GCK-02, GCA-03, or an equivalent unit.
Random Number Generator
In this mode, the DMAD outputs a true random number each time a radioactive particle is detected. The Geiger counter is typically set up to detect background radiation, using naturally occurring radioactivity as the source of randomness.
Selectable ranges:
- 1–2 (binary / heads or tails)
- 1–4
- 1–8
- 1–16
- 1–32
- 1–64
- 1–128
Depending on background radiation levels, the generator produces approximately 20–40 random numbers per minute. Random numbers are output through the TTL serial port for interfacing with another device.
Serial Output & Graphing Software
The DMAD provides a serial output compatible with the Images USB-TTL cable. Together, they connect your analog Geiger counter to the Images Geiger Counter Graphing Program.
The free software is for non-commercial use only.
USB-TTL cable: $24.95. Add it using the option in the DMAD order form above.
Analog Digital Radiation Meter
The ADM counts the pulse output of a standard analog Geiger counter and provides a visual readout of CPS, approximate radiation level in imperial or metric units, and an analog radiation field strength meter.
- 8–12 VDC or 5 VDC power supply input
- Counts TTL pulses from an analog Geiger counter
- Digital CPS readout
- Radiation level in imperial or metric units
- LCD backlight
- Available as a kit or assembled
ADM-01A: $64.55, assembled and tested
ADM-01K: $45.55, kit requiring assembly
ADM Display Operation
The first line alternates every second between Counts Per Second (CPS) and approximate radiation level in either imperial measurements (mR/hr) or metric measurements (mSv/hr).
The second LCD line is an analog radiation field strength meter that provides a quick visual indication of the current CPS reading.