THM420 Adjustment Procedures
14
Handheld and Benchtop Instruments Basic Service
Adjustment Procedures
This section contains procedures to adjust the THM420. If your instrument fails
a performance requirement, use these procedures to return it to factory specifica-
tions.
In this section you will find the following information:
H Instructions on how to prepare the instrument for adjustment
H Step-by-step adjustment procedures
The procedures in this section do not verify performance. To confirm that your
instrument meets factory specifications, perform the procedures in the Perfor-
mance Verification section.
Preparation for Adjustment
The following guidelines apply to all instrument adjustments:
H Perform all adjustments in a 20° to 30_ C (68_ to 86_ F) ambient environ-
ment.
H Before making any adjustment, warm up the instrument for at least 20
minutes.
H Do not alter any setting without reading the entire adjustment procedure first.
H Do not alter a setting unless a performance characteristic cannot be met at
the current setting.
H Read the Safety Summary at the beginning of this manual.
You must remove the bottom cover to gain access to the internal adjustments. To
remove the cover, refer to Figure 2 while performing the following steps.
1. Remove the battery pack.
2. Lay the instrument face down on a flat work surface.
3. Remove the four cover screws with a Phillips-head screwdriver.
4. Carefully lift the bottom cover off of the instrument.
5. Replace the battery pack (the instrument must be powered for the adjustment
procedures that follow).
Remove the Bottom Cover
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