Keithley 2750 User Manual page 101

3-10 Basic DMM Operation
Model 7700 switching module
Connections for the Model 7700 switching module are shown in
DCV and ACV measurements
Ratio and channel average calculations — Ratio calculates the reading ratio of two
channels, while channel average calculates the reading average of two channels. For these
calculations, paired switching channels are used. Primary channels 1 through 10 are paired
to channels 11 through 20 (channel 1 paired to channel 11, channel 2 paired to channel 12,
and so on). As shown in
channel (i.e., 104), and the other source is connected to its paired channel (i.e., 114).
NOTE
Figure 3-3
DCV and ACV connections using Model 7700 switching module
Caution: Maximum input: 300VDC or RMS, 1A switched,
60W, 125VA maximum
Model 7700
Switching
Module
A. DCV Connections
Model 7700
Switching
Module
B. ACV Connections
DC
Voltage
Source
C. Ratio and Channel Average Connections (DCV)
Note: The low connections for channels 1 through 10 do not
need to be referenced to the low connections for
channels 11 through 20.
(Figure
Figure 3-3C, one DC voltage source is connected to a primary
The ratio and channel average calculations are covered in
H
CH 1-20
L
H
CH 1-20
L
H
Model 7700
CH 11-20
L
Model 2750 Multimeter/Switch System User's Manual
3-3A and B), channels 1 through 20 can be used.
DC Voltage
Source
AC Voltage
Source
Switching
Module
Figure 3-3. For basic
Section 5.
H
CH 1-10
L
DC
Voltage
Source