4. Turn on the instrument and use the following table to verify that
the readings on each range are within specifications.
Table 1. Performance Verification
Model No. Range Reading Model No. Range Reading
874F 200 32.0 ± 1.2°F 879 760 0 ± 1°C
2000 32 ± 2°F 1400 32 ± 2°F
874C 200 0.0 ± 0.5°C 875F 200 32 ± 1.2°F
1100 0 ± 1°C 752 32 ± 2°F
878 1100 0 ± 1°C 875C 200 0.0 ± 0.6°C
2000 32 ± 2°F 400 0 ± 1°C
BATTERY INSTALLATION/REPLACEMENT
WARNING
Turn the instrument off and disconnect the
input probe before removing the bottom
cover. Reinstall the cover before resuming
use of the instrument.
1. Place the unit face down on a bench or other similar surface
and remove the screws from the bottom cover.
2. Separate the bottom cover from the rest of the instrument by
grasping the top of the case (just above the display) and care-
fully lifting it away from the display.
3. Remove the old battery.
4. Place the new battery in the battery compartment. Be sure to
observe the proper polarity. Refer to Figure 2.
5. Reinstall the bottom cover before resuming use of the instru-
ment.
Figure 2 Battery Installation
6
NOTE
An open sensor or overrange condition is indicated by the
following display.
3
Figure 1.
Model 878 Control Layout
All Others Similar
On/Off Range Switch
3 1/2 Digit Display
Minus Sign Displayed
Plus Sign Implied
Low Battery Indicator
Miniature TC Connector
i
First digit displays
the number one.
Remaining display
blank.
BATTERY
BATTERY TERMINALS
