Keithley 2750 User Manual page 65

2-10 Close/Open Switching Module Channels
TOO SMALL or TOO LARGE — These messages also indicate an invalid channel. TOO
SMALL indicates that the specified channel and any other lower numbered channel is
invalid. TOO LARGE indicates that the specified channel and any other higher numbered
channel is invalid.
Figure 2-4
System channel operation — specifying measurement channel to close
OPEN
CLOSE:SINGLE
CLOSE CH: XXX
OPEN key (ALL menu option)
The ALL menu option of the OPEN key opens all channels for all switching modules
installed in the Model 2750
is installed in slot 1, OPEN: ALL will open all measurement channels (101 to 120, 121,
and 122), the backplane isolation channels (124 and 125) and the 2-pole/4-pole channel
(123).
for the Model 7700.
Perform the following steps to open all channels:
1.
2.
NOTE
Figure 2-5
System channel operation — opening all channels in mainframe
OPEN
OPEN: ALL
CLOSE Press CLOSE key
Display SINGLE option
and press ENTER
Specify channel number (XXX)
and press ENTER
(Figure
Figure 2-2 shows the backplane isolation channels and the 2-pole/4-pole channel
Press the OPEN key to display "OPEN: ALL."
Press OPEN a second time (or press ENTER) to open all channels.
Opening the system channel disables Ratio or Channel Average. Ratio and
Channel Average operation are covered in
Press OPEN key
CLOSE
Display ALL option
and press OPEN again
Model 2750 Multimeter/Switch System User's Manual
2-5). For example, if a Model 7700 switching module
Section 5.