1.6
Reserve
1 – 5
3. Perform an auto-phase adjustment by pressing the [Phase] but-
ton within the AUTO block. After a brief delay, the REFER-
ENCE display should show near 0 deg.
4. Turn the
Time Constant knob counterclockwise to the
min
position. Adjust the scope for 1 V per vertical division, and
around 2.5 ms per horizontal division, and adjust the trigger.
You should see a fully-rectified positive sine wave, as shown
in Figure 1.1.
Figure 1.1: Mixer waveform at 0
◦
(left) and 90
◦
phase shifts (right).
5. Turn the
Quadrant knob one click clockwise. The signal is
now 90
◦
out of phase with the reference signal, as shown in
Figure 1.1.
6. Turn the
Quadrant knob one click clockwise. The signal is
now at 180
◦
relative to the reference signal, as shown in Fig-
ure 1.2.
7. Turn the
Quadrant knob one click clockwise. The signal is
now 270
◦
out of phase with the reference signal, as shown in
Figure 1.2.
1.6
Reserve
1. Restore
default
settings
by
pressing
[Recall];
turn
REFERENCE if necessary to display ”deFLt”, and then
press [Recall] again.
2. Perform an auto-phase adjustment by pressing [Phase] in the
AUTO block. After the pause, the phase should show a value
near 0 deg.
SR124
Analog Lock-In Amplifier
