2-10 Close/Open Switching Module Channels Model 2750 Multimeter/Switch System User’s Manual
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 key (ALL menu option)
The ALL menu option of the OPEN key opens all channels for all switching modules
installed in the Model 2750 (Figure 2-5). For example, if a Model 7700 switching module
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). Figure 2-2 shows the backplane isolation channels and the 2-pole/4-pole channel
for the Model 7700.
Perform the following steps to open all channels:
1. Press the OPEN key to display “OPEN: ALL.”
2. Press OPEN a second time (or press ENTER) to open all channels.
NOTE Opening the system channel disables Ratio or Channel Average. Ratio and
Channel Average operation are covered in Section 5.
Figure 2-5
System channel operation — opening all channels in mainframe
CLOSEOPEN
CLOSE CH: XXX
CLOSE:SINGLE
Press CLOSE key
Display SINGLE option
and press ENTER
Specify channel number (XXX)
and press ENTER
CLOSE
OPEN
OPEN: ALL
Press OPEN key
Display ALL option
and press OPEN again
2750-900-01.book Page 10 Wednesday, August 3, 2011 7:56 AM
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