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1 – 8
1.9 Reference oscillator output
display should show a value near 2.00 kHz.
5. Turn Mode back to Internal, and then turn it back to f External.
Immediately after turning the mode to external, press [Lock
Assist] in the AUTO section. The display should show "ASSt
Loc", and then the SR124 should lock, displaying the external
frequency .
6. Turn Mode to 2f External, and then press [Lock Assist]. The
display should show "ASSt Loc", and then "Err outr", indicat-
ing the frequency is out of range for the oscillator.
7. Turn the Range knob clockwise one click to select 200–21k.
After a few seconds, the oscillator should lock. Press [Freq] to
measure the oscillator; the result should be near 4.000 kHz.
8. Turn Mode again, to 3f External, and press [Lock Assist]. The
REFERENCE display should show the result near 6.000 kHz.
1. Restore
default
REFERENCE if necessary to display "deFLt", and then
press [Recall] again.
2. Connect a BNC cable from the rear-panel Reference Output 0
to the Channel 1 of the oscilloscope. Trigger the scope on the
waveform, and verify a 1 kHz, 0.7 Vrms (2 V peak-to-peak) sine
wave.
3. Connect a second BNC cable from the rear-panel Reference
Output 90 to Channel 2 of the scope. Verify the Channel 2
signal lags Channel 1 by 90 .
4. Disconnect the cable from the rear-panel 90 output, and con-
nect it to the 180 output. Verify the Channel 2 signal on the
scope appears inverted relative to Channel 1 (lagging by 180 ).
5. Disconnect the cable from the rear-panel 180 output, and con-
nect it to the 270 output. Verify the Channel 2 signal on the
scope lags Channel 1 by 270 (leading by 90 ).
6. Disconnect the Channel 2 BNC from the rear-panel of the SR124,
and connect it to the front-panel Ref. Out BNC.
7. Press the [Ampl] button. Press the REFERENCE knob in
once, to select coarse, and then turn REFERENCE clockwise
until the display reads 10.00 V. Verify on the oscilloscope that
Channel 2 shows a sine wave of approximately 10 Vrms (28 V
peak to peak). The signal should be in-phase with Channel 1.
settings
by
pressing
SR124 Analog Lock-In Amplifier
Getting Started
[Recall];
turn
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