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1 – 6
1.7 Output offset
Figure 1.2: Mixer waveform at 180 (left) and 270 phase shifts (right).
3. Turn SENSITIVITY 2 clicks counterclockwise, to 100 mV. The
meter should read near 100% deflection
4. Turn Quadrant (in the Reference section) one click clockwise,
to the 90–180 interval. The meter should be near 0 deflection.
5. Turn SENSITIVITY 3 clicks counterclockwise, to 10 mV. The
meter should still read between
with no overload indicators.
6. Turn SENSITIVITY 1 click counterclockwise, to 5 mV. The sen-
sitivity OVLD indicator should light.
7. Press [Reserve] twice, to select Normal. The OVLD indicator
should turn o . Manually adjust the phase setting (with the
REFERENCE knob) to null the meter. Turn SENSITIVITY 2
more clicks counterclockwise, to 1 mV. OVLD should remain
o . Turn SENSITIVITY once more, to 500 V. OVLD should
light.
8. Press [Reserve] twice again, to select High Res. OVLD should
turn o . Manually adjust the phase setting again to null the
meter. Turn SENSITIVITY 2 more clicks counterclockwise,
to 100 V. You may try to further null the signal by manually
adjusting the phase setting again, although the signal may be
unstable with so much gain.
1. Restore
default
REFERENCE if necessary to display "deFLt", and then
press [Recall] again.
30% and
settings
by
pressing
SR124 Analog Lock-In Amplifier
Getting Started
30% deviation,
[Recall];
turn
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