8508A
Users Manual
9. Press SAMPLE to initiate the adjustment operation.
Adjustment is complete when the busy legend goes out and the calibrated
measurement is displayed.
10. On the Calibrator, select
STBY to put the Calibrator output into Standby.
11. On the 8508A, select
ACI to revert to the range menu.
Frequency Adjustment
The 8508A frequency adjustment operation requires a signal at exactly 1MHz (
Set is not
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
ACV key, select the 2 V range.
2. Confirm that the 8508A is configured for internal guard (External Guard is
deselected) by checking that the
ExGd legend does not appear on the left-hand
display.
3. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EX GRD is deselected).
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
frequency and enable phase locking via the front panel menus.
Procedure
1. On the calibrator select 1V 1MHz, select OPR to operate the calibrator output.
2. On the 8508A, Press
CAL to enter the CALIBRATION menu, and select SPECIAL.
3. Select
Freq to initiate the adjustment operation.
Adjustment is complete when the Busy legend goes out.
4. On the 8508A select
QUIT from the SPCL menu.
5. On the Calibrator, set
STANDBY.
Cal Due Date Entry
On completion of all adjustment operations it is recommended that the user updates the
stored
CAL due date with the date for the next adjustment. For consistency, this date
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
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