Frequency Adjustment; Cal Due Date Entry - Fluke 8508A User Manual

8508A
Users Manual
9. Press SAMPLE to initiate the adjustment operation.
10. On the Calibrator, select
11. On the 8508A, select

Frequency Adjustment

The 8508A frequency adjustment operation requires a signal at exactly 1MHz (
available on the 8508A for frequency adjustment). 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 adjustment operations with the calibrator.
Alternatively, the 1MHz frequency reference may be used directly as an input signal for
the 8508A for frequency adjustment.
Initial Setup and Connections
1. Press the
2. Confirm that the 8508A is configured for internal guard (External Guard is
3. Ensure that the calibrator output is set to
4. Connect the Calibrator to the 8508A as shown in Figure 6-1.
5. If required, connect the calibrator rear panel phase lock input to a 1MHz reference
Procedure
1. On the calibrator select 1V 1MHz, select OPR to operate the calibrator output.
2. On the 8508A, Press
3. Select
4. On the 8508A select
5. On the Calibrator, set

Cal Due Date Entry

On completion of all adjustment operations it is recommended that the user updates the
stored
should be the same as the adjustment due date shown on any adjustment stickers the user
may also attach to the instrument. It is also recommended that a calibration integrity seal
is applied to prevent unauthorized access to the rear panel calibration enable switch.
6-32
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
ACI
key, select the
ACV
deselected) by checking that the
display.
Guard ( is deselected).
EX GRD
frequency and enable phase locking via the front panel menus.
CAL
to initiate the adjustment operation.
Freq
Adjustment is complete when the Busy legend goes out.
QUIT
STANDBY
due date with the date for the next adjustment. For consistency, this date
CAL
to put the Calibrator output into Standby.
STBY
to revert to the range menu.
range.
2 V
legend does not appear on the left-hand
ExGd
STANDBY
to enter the
CALIBRATION
from the menu.
SPCL
.
Set
and configured for Internal
menu, and select
SPECIAL
is not
.