Model 194 Series
User’s Manual
Section 3
Ludlum Measurements, Inc.
Page 3-2
October 2020
Battery Dependence:
instrument calibration change of less than 3% from
fresh batteries to batteries at the threshold of BAT OK, see below.
Power
: standard alkaline
˝
AA
˝
cell batteries, secured in an isolated
compartment
Battery Life
: typically 200 hours without backlight or audio
BAT OK:
The BAT position of the main rotary switches shows the battery
voltage on the display and turns on the green LED when battery power is good.
When battery power is less than 2.1 V, the green LED will not light and the user
should immediately replace batteries.
Audio Output:
built-in unimorph speaker and
AUD ON
/
OFF
switch provided
on the front panel
Audio:
increasing radiation levels indicated by higher frequency pitch; enabled
or disabled by the
AUD ON
/
OFF
switch
Temperature:
from -10 to 50°C (14 to 122°F). Display will tend to “freeze”
if kept below 0 °C (32 °F) for several hours, so users should limit cold
temperature exposure to less than two hours.
Environmental Rating:
water resistant, IP rating of 65
Construction
: aluminum with beige powder-coat finish and silk-screened
nomenclature
Size
: 19 x 8.9 x 21.6 cm (7.5 x 3.5 x 8.5 in.) (H x W x L)
Weight
: 1.1 kg (2.5 lb), including batteries
