Frequency Calibration - Fluke 8508A User Manual

Table 6-7. AC Current Calibration Points and Sequence
8508A Range
200 A
2 mA
20 mA
200 mA
2 A
20 A
The procedure assumes the user has knowledge of the actual output value of the
calibrator at each point, from a measurement or from a certificate of calibration. The
feature allows a user to enter the true output value of the calibration standard where it
differs from the nominal point. If the calibrator output is considered to be exactly
nominal, use of the
On each range, the 8508A automatically recognizes the appropriate value as range zero or
range gain from the applied signal amplitude.
1. On the 8508A, select the required Range.
2. On the Calibrator select Output Current and Frequency, Operate.
3. On the 8508A, Press
4. Select on the
Set
5. Use the numeric keys with the
the calibrator, then press Enter.
6. Press
SAMPLE
Calibration is complete when the
measurement is displayed.
7. On the Calibrator, set Output to
8. On the 8508A, press

Frequency Calibration

The 8508A frequency calibration operation requires a signal at exactly 1MHz (
available on the 8508A for frequency calibration). If the calibrator frequency output is
not exactly nominal or sufficiently close to nominal it may be phase locked to an external
reference frequency at the required output frequency applied to its rear panel phase lock
input, for example from a laboratory frequency standard or off-air reference receiver. If
used, the calibrator should be disconnected from the frequency reference and phase
locking disabled before attempting any other calibration operations with the calibrator.
Alternatively, the 1MHz frequency reference may be used directly as an input signal for
the 8508A for frequency calibration.
Point
Zero (5 % Range)
Range Gain
Zero (0.5 % Range)
Range Gain
Zero (0.5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
feature is not required, also omit steps 3-5.
Set
to revert to
CAL CALIBRATION
.
CALIBRATION menu
SET VALUE
to initiate the calibration operation.
Busy
STANDBY
key to revert to the ranges menu.
ACI
Current
10 A
100 A
10 A
1 mA
100 A
10 mA
10 mA
100 mA
100 mA
1 A
1 A
10 A
menu.
menu to key in the true output value of
legend goes out and the calibrated
.
Calibration and Verification
Routine Calibration
Frequency
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
Set
is not
Set
6
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