Model 177
Technical Manual
Section 3
Ludlum Measurements, Inc.
Page 3-1
October 2018
Specifications
0
Power:
95-250 Vac wall transformer and 6 volt gell-cell (sealed lead-acid)
battery; typical battery life of approximately 50 hours in a non-alarming
condition with a fully charged battery.
Fuse:
internal resettable
Response Time:
toggle switch control selects FAST (2.2 seconds) or
SLOW (22 seconds) response, for 90% of full-scale reading
Linearity:
within 5% of full scale; typically ±2% of full scale reading when
measured with an electronic pulse generator
Battery Dependence:
Meter readings vary less than 3% within battery
check limits.
High Voltage:
variable from 400 to 1500 V
Input Sensitivity:
adjustable from -10 through -100 mV
Connector:
Series "C"
Audio:
unimorph speaker with volume control located on the front panel
Meter:
1 mA, size 6.4 x 6.4 cm (2.5 x 2.5 in.), DC movement
Meter Scale:
0-500 CPM; 0-1.5 kV;
BAT TEST
Ranges:
four ranges of X1 through X1K
Recorder Output:
adjustable from 0 to 1.25 V at 1 mA
Alarm Output:
current sink to 200 mA DC, open circuit voltage not to
exceed 50 Vdc
Unbuffered Output:
may be used to externally add to or subtract from the
meter reading
Section
3
