Spectrum Techniques

ST-250 Ratemeter

Nuclear Radiation Ratemeter by Spectrum Techniques Model ST-250

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The ST-250 is a versatile ratemeter for nuclear radiation measurements. This ratemeter is light-weight, rugged and is powered by internal rechargeable batteries. Battery power provides eight hours of portable operation for surveying, instruction and training. Continuous bench top operation is accommodated with the AC charger supplied.

Fully variable high voltage and advanced design will support different types of Geiger Mueller probes with operating voltage up to 1200 volts and count-rates up to 150,000 events per minute. Featuring a large precision meter, the ST-250 offers dual scales for direct reading in both counts per minute and counts per second for international markets.

To aid in classroom demonstration of basic radiation properties, a PC interface is included with emulation software. This allows data from the ratemeter to be collected in the computer and displayed on the screen in either analog or digital format. Measurements may be run directly from the computer and data is stored in files which may be transferred directly to common spreadsheet programs. This advanced feature allows access to spreadsheet functions such as mathematical calculations and graphical output of data.

ST-250 ratemeter display in cpsModel ST-250 Ratemeter cps digitized analog display

Model ST-250 Radiation Ratemeter Energy Curve (Spechtech)ST-250 Energy Curve


Input; BNC connector. Accepts standard Geiger probes. High voltage; 0 to +1200volts,continuously variable by 10-turn potentiometer. Display; Precision 4.5" meter. Ranges; CPM--- 600, 1500, 6000, 1500, 60000, 150000. CPS--- 10, 25, 100, 250, 1000, 2500. HIGH VOLTAGE---0 to 1200 volts. Audio; Piezo alerter with full volume control. Data Link ; DB-9 male, accepts standard cable to connect to IBM compatible computer serial port. Power; Internal rechargeable NiCd batteries, with LOW POWER indicator. Typically 8-hours run time on full charge. Input 9 volt DC, at 300mA from AC line charger. Specify 110-120, or 220-240 VAC charger at time of order. Dimensions; 12 in. W, x 8 in. H, x 4.5 in. D


RADEM emulation software. DOS program runs on most IBM compatible PC's including CGA, EGA, VGA, SVGA, and Hercules graphics systems. Real time display of simulated analog ratemeter, auto ranging, CPM or CPS, digital ratemeter, nuclear scaler, preset timer, spreadsheet compatible data files.

Ordering Information

ST-250-PC Complete system for IBM compatibles.
ST-250 Ratemeter with PC interface and RADEM software.

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