Alpha/Beta Benchtop Counter Part Number: 48-1323 • Operates with Two Detectors: Scintillator for Alpha, GM for Beta • 4-Range Meter • Linear Analog Scale Readout • 50-Hour Rechargeable Battery Introduction The Model 177-56 is a rugged benchtop ratemeter with a dualdetector system, allowing the selection of either alpha or beta readings, and works as an alpha/beta frisking station. The instrument supports GM and scintillation type detectors and displays the count rate on a four-decade, linear readout analog meter. It can be used where line power is available or in portable applications for up to 50 hours using the internal rechargeable battery. Front-panel controls include power on/off switch, volume control, a four-position range selector switch, fast/slow response switch, and push-buttons for count reset, battery test, and high-voltage test. On the back panel are the power cord connection, a 9-pin type “D” data plug, and calibration controls. Specifications COMPATIBLE DETECTORS: Scintillation (alpha), GM (beta) LINEARITY: Within 5% of full scale; typically ±2% of full scale reading when measured with an electronic pulse generator BATTERY DEPENDENCE: Meter reading varies less than 3% within battery check limits METER SCALE: 0 - 500 cpm, 0 - 1.5 kV, BAT TEST METER: 1 mA, size: 6.4 x 6.4 cm (2.5 x 1.5 in.), DC movement MULTIPLIERS: x1, x10, x100, x1k RESPONSE: Toggle switch control selects FAST (2.2 s) or SLOW (22 s) response, for 90% of full-scale reading RESET: Push-button to zero meter CALIBRATION CONTROLS: Accessible from back of instrument (protective cover provided) HIGH VOLTAGE 1 (ALPHA): Variable from 400 to 1500 V HIGH VOLTAGE 2 (BETA): 900 V INPUT SENSITIVITY 1 (ALPHA): Adjustable from -10 to -100 mV INPUT SENSITIVITY 2 (BETA): -10 to -25 mV (fixed) AUDIO: Unimorph speaker with volume control located on the front panel DATA OUT: 9-pin series “D” connector allowing for exernal connections of the following items: battery, unregulated supply, instrument common ground, pulse out, external background subtract, recorder output RECORDER OUTPUT: Adjustable from 0 to 1.25 V at 1 mA UNBUFFERED OUTPUT: May be used to externally add to or subtract from the meter reading POWER: 95 to 250 VAC wall transformer and 6 V gel-cell (sealed lead-acid) battery BATTERY LIFE: Approximately 50 hours with a fully charged battery FUSE: 1 amp 3AG fuse CONNECTORS: Series “C” connector for beta GM detector, MHV connector for alpha scintillator detector FINISH: Powder coat paint SIZE (H x W x L): 16 x 20.3 x 17.5 cm (6.3 x 8 x 6.9 in.), excluding handle WEIGHT: 1.9 kg (4.2 lb) with battery Ludlum Measurements, Inc. P.O. Box 810, Sweetwater, Texas 79556 Web: ludlums.com Tel: 800-622-0828 / 325-235-5494 Fax: 325-235-4672 Email: [email protected] Note: specifications subject to change without notification. We are not responsible for errors or om