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Model 177-56

Model 177-56

Alpha/Beta Benchtop Counter

Part Number: 48-1323

Features

Operates with Two Detectors: Scintillator for Alpha, GM for Beta
4-Range Meter
Linear Analog Scale Readout
50-Hour Rechargeable Battery

The Model 177-56 is a rugged benchtop ratemeter with a dual-detector 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 Dial	0 - 500 cpm, 0 - 1.5 kV, BAT TEST
Meter	1 mA, size 6.4 x 6.4 cm (2.5 x 2.5 in.), DC movement
Multipliers	x1, x10, x100, 1k
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, provides click-per-event audio
Data Out	9-pin series "D" connector allowing for external 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

Options

Option	Description	Part Number
4 - 20 mA Output (Isolated)	Analog output signal.	4347-437
Shelf (or Wall) Bracket	Mounting bracket for the Model 177-Series of instruments.	7172-078-02