2.3
Navigating the front panel
2 – 15
The output of the entire AC signal chain, just prior to the phase
sensitive detector, can be monitored from the “Signal Monitor” BNC.
2.3.2
Output section
The next section of the instrument is “Output”. See Figure 2.4 for
detail.
Time Constant
12dB/oct.
6dB/oct.
OVLD
On
AC Volt
Lock-In
OFFSET
OUTPUT
1
1
3
3
10
10
30
30
100
100
300
300
min
ms
s
OVLD
600 Ω
OUTPUT
knob
BNC
Slope
On/Off
Modify
Mode
Figure 2.4: The SR124 front panel output section.
The panel meter shows the output signal from the SR124. This is the
same signal as appears at the output BNC. The meter shows
+
100%
deflection when the BNC output is
+
10 V, and
−
100% deflection when
the BNC output is
−
10 V.
If any part of the signal path is overloaded, the master
OVLD
an-
nunciator, at the upper right of the panel meter, is lit.
2.3.2.1
Time constant
The output filter time constant is set with the
Time Constant knob.
(
OFLT
, 4 – 14 )
The choice of one or two poles of output filter is toggled by pressing
[Slope]. (
OFSL
, 4 – 14 )
SR124
Analog Lock-In Amplifier
