Omega CL940A, Руководство пользователя

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Service Information
4-14
4. S
ERVICE
I
NFORMATION
Inspection and Cleaning
To extend the life of the instrument, inspect and clean the instrument regularly. Inspect the
instrument for any significant abrasions, cuts, cracks, dents, or other signs of damage on
the case, keypad, and display lens. Inspect the connectors for breaks, dirt, or corrosion.
Ensure all screws are securely fastened, and if equipped, that the tilt stand/magnet/hanger
is in good condition and locks into position properly.
With all screws securely fastened and the battery compartment cover in place, use a damp
cloth or towel to wipe down the instrument. Use care to avoid scratching the display lens.
Mild, non-abrasive detergents may be used providing the instrument is then wiped down
with a clean damp cloth or towel.
Calibration
4.2.1 Verification Procedure
The voltage calibration of the instrument can be verified by checking the mV points noted in
Figure 12 below. A Digital Multi-Meter with suitable accuracy
9 is needed along with a set of
Copper mini-TC male connectors, with good quality, low-thermals wire. The wire cannot be
tinned.
1. This procedure shall be performed within environmental conditions of 23 ±1 °C
and 5% to 95% RH.
2. The unit under test (“UUT”) shall be acclimated to the Controlled Environment for
a minimum of four (4) hours.
3. Disable the auto-power off feature by pressing (1.5s) . The remaining battery life
indicator will flash once, indicating auto-power off is disabled.
4. Connect a copper daisy-chain from Source Channel 1 to Read Channel 2 and to a
DMM of suitable accuracy
9 .
9
Suitable accuracy means a metrology-grade DMM. To achieve mV limits shown in Appendix C, the DMM must
have accuracy equivalent to 30 ppm of reading and 9 ppm of range on the 100mV range.