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REFERENCE AND PHASE MENU
Sine Output
Harmonic
12.345 deg.
Rotate
90 deg.
Internal
Ref Frequency
50.000 Hz
# 1
0.100 V rms
Ref. Source
Ref. Phase
Sine Output
Harmonic
Reference Source
90° Shift
Phase Shift
REFERENCE
PHASE
Internal Internal Sweep External
Reference
Frequency
Sweep Menu
Reference
Slope
Sweep Type
Sweep Limits
Return
Reference and Phase The Reference and Phase menu sets the reference source, phase shift,
and detection harmonic. The internal oscillator frequency , sweeps, and
amplitude are also specified in this menu.
Reference Phase Pressing the Reference Phase key (top soft key) selects the reference
phase shift as the active entry field. A new phase shift may be entered
from the numeric keypad or the knob may be used to adjust the phase.
The phase shift ranges from -180° to +180° with 0.001° resolution. A
numerically entered phase is rounded to the nearest 0.001°.
Pressing the Rotate 90 Degrees soft key will add 90.000° to the present
value of the phase shift.
When using an external reference, the reference phase shift is the phase
between the external reference and the digital sine wave which is multi-
plying the signal in the PSD. This is also the phase between the sine
output and the digital sine wave used by the PSD in either internal or
external reference mode. Changing this phase shift only shifts internal
sine waves. The effect of this phase shift can only be seen at the lock-in
outputs X, Y and θ. R is phase independent.
Auto Phase
Pressing [AUTO PHASE] will adjust the reference phase shift so that the
measured signal phase is 0°. This is done by subtracting the present
measured value of θ from the reference phase shift. It will take several
time constants for the outputs to reach their new values. Auto Phase may
not result in a zero phase if the measurement is noisy or changing.
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