Model 194 Series
User’s Manual
Section 3
Ludlum Measurements, Inc.
Page 3-1
October 2020
Specifications
0
Detector
: 3.2 x 3.2 cm (1.25 × 1.25 in.) lead-loaded plastic scintillator
Linearity:
±10%
Energy Response (Model 194 and 194/S only):
energy-flat within 30%
ambient dose equivalent from 50 to 1300 keV, relative to
137
Cs response
Detector Voltage:
adjustable from front panel calibration controls during
calibration, variable from approximately 250 to 1200 Vdc
Operating Voltage:
two ranges, LO and HI
LO:
0 to 1999 µrem/hr or 0.00 to 19.99 µSv/h
HI:
0.0 to 199.9 mrem/hr or 0 to 1999 µSv/h
Response Time:
in the F (fast) position, response time is 3 seconds, and 15
seconds in the S (slow) position; both measurements made for a response
from 10% to 90% of the final reading
LCD Display
: 3 ½ digit LCD, digit height 10.2 mm (0.4 in.), 0-2 V input, with
over-range indication (leftmost “1” and no other digits)
Section
3
