Model 177 Alarm Ratemeter only

Model Number:


051-177  Model 177 Alarm Ratemeter only. (Probe not included)

Select Probe from Probe section

  • Operates on wall current or rechargeable battery
  • Indicated use: multi-purpose radiation monitoring, surveying; frisking
  • Suggested Detectors: GM; scintillation
  • High Voltage: adjustable from 400 to 1500 volts
  • Input Sensitivity: adjustable from -10 to -100 mV
  • Linearity: within 5% of full scale
  • Meter: 6.4 x 6.4 cm (2.5 x 2.5 in) 1 mA, DC movement
  • Meter Dial: 0-500 cpm; 0-1.5 kV; BAT TEST
  • Audio: built-in unimorph speaker, with volume control, to provide clickper-event audio or audible alarm indicator
  • Alarm Set: front-panel locking control allowing alarm to be set at any point on the meter (can be read on meter)
  • Alarm: indicated by red lamp and full volume audible tone (greater than 60 dB at 61 cm (2 ft)
  • Calibration Controls: accessible from back of instrument (protective cover provided)
  • Reset: pushbutton to zero meter and/or reset alarm
  • Multipliers: x1, x10, x100, x1k
  • Response: toggle switch control selects FAST (2.2 sec) or SLOW (22 sec) response, for 90% of full scale reading
  • Data Out: 9-pin series "D" connector allowing for external connections of the following items: battery, unregulated supply, instrument common ground, alarm signal (current sink), pulse out, external background subtract, and recorder output.
  • Recorder Output: correlated to meter reading (adjustable to 0 to 1.25 volt at 1 mA)
  • Power: 95-250 Vac through wall adaptor, and 6-volt sealed lead-acid rechargeable battery (built-in)
  • Battery Charger: battery is continuously trickle-charged when instrument is connected to line power and turned on
  • Battery Life: typically 50 hours in non-alarm condition (battery condition can be checked on meter)
  • Size: 5" H x 8" W x 6" L
  •  Weight: 4.2 lb

The Model 177 is a rugged benchtop ratemeter with alarming
capability. They are very popular for frisking operations at stations
where line power is available but can also be used in portable
applications for up to 50 hours using the internal rechargeable battery.
The 177 supports GM and scintillation type detectors and displays the
results on a linear readout analog meter. The audio alarm is adjustable
from 0 through 150% of full scale, and is factory set to latching.
Reconfiguration to non-latching can be accommodated via a minor
internal change.
Front-panel controls include a 4-position rotary switch for selecting
each detector decade, an alarm set control, an audio volume adjust,
fast/slow response switch, power on/off switch and push buttons for
count reset, battery test, high-voltage test and alarm test. The back
panel contains the power cord connection and a 9-pin type "D" plug,
power output, alarm output, pulse output, and a recorder output.