Output Section - Stanford Research Systems SR124 Operation And Service Manual

2.3 Navigating the front panel

2.3.2 Output section

2.3.2.1 Time constant
SR124 Analog Lock-In Amplifier
The output of the entire AC signal chain, just prior to the phase
sensitive detector, can be monitored from the "Signal Monitor" BNC.
The next section of the instrument is "Output". See Figure 2.4 for
detail.
OUTPUT
6 dB/oct.
ms
12 dB/oct.
30
10
Slope
3
1
min
Time Constant
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.
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 )
OFFSET
OVLD
300
100 1
On
3
s
10
On/O
30
100
knob
300
Modify
2 – 15
OVLD
OUTPUT
Lock-In
AC Volt
Mode
BNC
600 Ω