5730A
Operators Manual
4-30
6. Touch Phase Reference to toggle between INTERNAL (the default, not locked to
anything) and EXTERNAL.
7. If the Calibrator cannot lock onto the external signal for any reason, it shows the
message below:
Current
output
NORMAL
External
Guard
OFF
Boost
ON
Wideband
OFF
Setup
menu
Scale Phase Control
90°
-180 -90 0 90 180
+/- 62.0 ppm (1 year) 213 days since calibration
3/14/2013 10:52am
External
Sense
OFF
External
Guard
OFF
Boost
OFF
Wideband
OFF
Setup
menu
Standby
V
kHz
1.0000
1.000000
Auto Range 2.2 V
External
OFF
Error 1809: Cannot Phase Lock To Signal
OK
hhp129.eps
8. To reactivate the numeric keypad for controlling the output, touch OK. Phase locking
remains active until the frequency is changed or turned off phase lock with the Phase
Reference selection.
Auxiliary Amplifier Use
Increase the output capability of the Calibrator with an auxiliary amplifier. The Calibrator
has rear-panel connectors that interface with two different amplifiers. Both amplifiers can
be connected to the Calibrator simultaneously, but only one amplifier can be designated
as the voltage boost and one amplifier as the current boost in the setup menu. Only one
output can be active at a time. Table 1-1 shows the ranges and functions supported by the
5725A. The choice of active amplifier can be changed dynamically in a remote system,
since such systems can control any front panel function.
During boost operation, operate the amplifier from the Calibrator front panel. The
Calibrator computes and supplies the correct excitation signal to drive the amplifier. The
Calibrator display always shows the actual output of the amplifier, not the excitation
output of the Calibrator. In general, for the 5725A, the amplifier is activated
automatically by selecting an output amplitude only available in its range. For the
52120A and in some cases with the 5725A and 52120A, the Boost selection is used to
activate and deactivate the selected amplifier. Refer to the subsequent text for specific
operation instructions for each type of amplifier.
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