Fluke 8508A, Руководство по обслуживанию

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Calibration and Verification
Performance Verification
3
3-33
* Fluke guarantees the Multimeter’s performance verification using specifications stated
to 99 % confidence level.
Preparation
1. Allow the Multimeter to warm-up under power in the specified environment for at
least 4 hours.
2. Press the
CLEAR
key, select
Pwr Up Dflt
to restore the power up default configuration
and display the
DCV
menu.
3. Press the
Test
key and select
Std to initiate a selftest
. Should the Multimeter fail,
contact your local authorized Service Center, ensuring that the full circumstances of
the failure are reported.
DC Voltage Checks
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following
calibration procedures:
•
Never touch any lead or terminal unless you are absolutely
certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you
handle them in any way.
Equipment Configuration
1. Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2. Connect the equipment as described for Routine Calibration.
3. Press the
DCV
key
4. Press the
CONFIG
key. Select
Filt
and
RESL7
.
5. Confirm that the Multimeter is configured for internal guard (External Guard is
deselected) by checking that the
Ext Grd
legend does not appear on the left-hand
display.
Procedure
Repeat the following sequence for each range, starting with the 200mV range and
working up to the 1kV range, as listed in Table 3-8. An input zero operation is performed
on each Multimeter range prior to performing the range verification measurements with
the calibrator set to zero by range locking the calibrator in the range from which the
output will be obtained.
1.
Select the required Multimeter range.
2. On the calibrator set the output to zero. Select OPERATE.
3. On the Multimeter press the
INPUT
key, and select
Zero Rng
to initiate the zeroing
operation.
The
Busy
legend will appear, and then extinguish when the zero operation has
completed.
4. On the calibrator select the value required for verification in the positive polarity.