Keithley 2790, Reference Manual

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Model 2790 SourceMeter
®
Switch System Reference Manual 2-11
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 7702
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 2790 (
Figure 2-5 ). For example, if a Model 7702 switching module
is installed in slot 2, OPEN: ALL will open all measurement channels (201 to 240, 241,
and 242), the backplane isolation channels (244 and 245), and the 2-pole/4-pole channel
(243).
Figure 2-2 shows the backplane isolation channels and the 2-pole/4-pole channel
for the Model 7702.
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.
klqb
Opening the system channel disables Ratio or Channel Average. Ratio and
Channel Average operation are covered in
Section 5 .
Figure 2-5
Opening all channels in mainframe
CLOSE OPEN
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