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Preparation for Adjustment
Open the Meter Case
Handheld Instruments Basic Service
The following guidelines apply to all DMM249 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.
To reassemble the multimeter following the adjustments, see page 21.
DMM249 Adjustment Procedures
19
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