one of my geiger counters has an analog meter scale and is calibrated in uRontgen for use with it's specific geiger tube, i would like to change the scale face to read in CPM (Counts Per Minute) so i can use it with any tube.
Means i need to connect something up to the GM tube input on the meter and simulate a GM tube and pulse it, increasing in frequency until it goes full scale on the analog meter so i can plot out a new scale in CPM.
These devices are called pulsers and are commercially available, but just dont ask how much they cost:
http://www.ludlums.com/component/virtuemart/pulse-generator-29-detail?activetab=specificationsMine does not need any kind of voltage readout, pulse amplitude or anything fancy like that.
you can see a typical HV drive / detection circuit on the mighty ohm counter schematic here:
http://mightyohm.com/files/geiger/geiger_sch_fixedR5R6.pngIdeally, i would like this to go upto 400-500khz so i can use it with my current ludlum too (which peaks out at 420,000CPM on it's current x100 scale)
i do have a rather poxy function gen i could use or i could write some code for a uC to provide the signal, it's just the driver circuit to actually pulse the GM input i need help on
can anyone offer any help or advice?