DMM91X Series Adjustment Procedures
Handheld and Benchtop Instruments Basic Service
33
Test Equipment
The test equipment listed in Table 8 on page 9 is a complete list of equipment
needed for the adjustment procedures. These procedures assume that the test
equipment is operating within tolerance.
Preparation for Adjustment
The following guidelines apply to all DMM91X Series adjustments:
H Perform all adjustments in a 21_ to 25_
C ambient environment with a
relative humidity of 75% or less.
H Warm up the multimeter for at least 15 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 open the multimeter case to access the internal adjustments. Use the
following procedure to open the case.
1. Lay the meter face down on a flat work surface that cannot damage the
multimeter face.
2. Remove the three screws from the case bottom using a standard Philips-head
screwdriver.
3. Gently lift the end of the case bottom at the end opposite from the display.
Then lift the end nearest the display until it unsnaps from the case top. See
Figure 2 for details.
To reassemble the multimeter following the adjustments, see page 39.
Open the Meter Case
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