Service manual

Calibration and Verification
Routine Calibration 3
3-11
3. Set the rear panel Calibration switch to Enable. Removal of any calibration sticker or
integrity seal covering the calibration switch will be necessary.
4. Press the
CAL key.
5. The
CALIBRATION menu is displayed.
The calibration menu appears, and the
CAL legend appears on the main display. When
entering
CAL mode and selecting a function the optimum resolution for performing
calibration in that function is automatically selected. Refer to Table 3-2 for the full
multimeter calibration sequence.
Note
It is recommended that the default resolutions are used for calibration purposes. Other
resolutions may be selected and calibration operations performed, but accuracy of
calibration will be degraded if calibration is performed in lower resolutions.
W Caution
When in
CAL mode with the CAL legend appearing on the main
display, the function of the SAMPLE key is modified from
normal operation. If pressed, the SAMPLE key will initiate a
calibration operation and permanently alter the Multimeter’s
calibration state. To avoid accidental mis-calibration do not
attempt to operate the Multimeter in External Trigger mode from
the front panel when in Cal, and only press the SAMPLE key
when a calibration operation is intended to be performed.
Table 3-2. Calibration Sequence
General Sequence for Full Multimeter Calibration
[1]
Enable Calibration
Enter Cal mode
Set rear panel calibration switch to ENABLE.
Access CALIBRATION menu .
Adc Cal Analog to digital converter alignment. Performed only if required.
DCV Range Zeros and Range Gains (200 mV to 1 kV Ranges).
ACV Range Zeros, Range LF Gains and Range HF Gains (200 mV to 1 kV
Ranges).
Ohms Range Zeros and Range Gains:
Ohms: 2 Ω to 2 GΩ Ranges, then LoI Ohms.
TruΩ: 2 Ω to 20 kΩ Ranges, then LoI TruΩ.
HiVΩ: 20 MΩ to 20 GΩ Ranges.
DCI Range Zeros and Range Gains (200 μA to 20 A Ranges).
ACI Range Zeros and Range Gains (200 μA to 20 A Ranges).
Frequency Frequency counter cal at 1 MHz
Exit Cal mode
NV input offsets
Quit the CALIBRATION menu.
Front & rear non-volatile input offset adjustments:
DCV, Ohms, TruΩ, HiVΩ (including LoI , 2 & 4-wire).
Set CAL DUE Set the date for the next external calibration
Disable Calibration Set rear panel calibration switch to DISABLE.
[1] To meet user's need, just one range on one function can be calibrated.
Interconnections
The Fluke 8508A-7000K Calibration kit contains a specially designed lead set which
connects directly to the terminals of the Multimeter, the 5720A, and the 5725A for the
purpose of Multimeter calibration. It is recommended that this lead kit be used to avoid
introducing measurement errors due to interconnections and to duplicate the
riešenia na presné meranie
http://www.elso.sk