Phase Locking To An External Signal - Fluke 5700A Series II Operator's Manual

3. Press the "Adjust Phase Shift" softkey. A cursor on the display shows the phase shift
of the variable phase output signal:
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4. To quickly select a multiple of 90º, press the appropriate softkey.
5. To select a phase output between -180º and 180º (including all intermediate
positions), turn the rotary knob to move the cursor to the desired position on the
scale. The Control Display shows the phase angle in ± degrees.
6. Press the "DONE Phase Adjust" softkey.
7. Press the "Phase Shift" softkey so "ON" appears. The "(∅-SHF" annunciator lights
indicating that variable phase output is on. The variable-phase reference signal stays
on after you leave the phase controls menu, and even when you switch
between current and voltage. It is turned off when you switch to a dc or ohms
function.
8. To reactivate the numeric keypad for controlling the output, press the "DONE Phase
Ctrls" softkey.

4-32. Phase Locking to an External Signal

The phase-lock feature locks the calibrator's main output signal in phase with an external
signal (1 to 10V rms at 10 Hz to 1.2 MHz) applied to the rear panel PHASE LOCK IN
BNC connector. You can use this feature with ac V, wideband voltage, or current outputs,
and combine it with variable phase output. You access the softkey that turns on phase
locking through the phase controls menu. To lock onto an external signal, proceed as
follows:
1. With the external signal source turned off, connect a coaxial cable between the
external signal source and the rear panel PHASE LOCK IN BNC connector.
When using PHASE LOCK IN, make sure the phase lock source is floating
relative to the calibrator's output. Ground loops that can occur if the two
devices are not isolated can cause amplitude errors in the calibrator's
output. These errors may be particularly significant in the millivolt
ranges.
2. Set an ac voltage or current output as described under "AC Voltage or Current
Output."

Phase Locking to an External Signal

Note
Front Panel Operation 4
4-35