Keithley 2790, Справочное руководство

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2-10 Model 2790 SourceMeter
®
Switch System Reference Manual
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The and keys can also be used to open all channels in the mainframe.
Simply increment or decrement the channel number until there is no channel
displayed.
Figure 2-3
System channel operation — closing next
or previous 7702 measurement channel
CLOSE key (SINGLE menu option)
The SINGLE menu option for the CLOSE key can be used to select a measurement channel
as the system channel (
Figure 2-4 ). Perform the following steps to select the system channel:
1. Press the CLOSE key. The “CLOSE:SINGLE” message will be
displayed.
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If the “CLOSE:MULTI” message is instead displayed when CLOSE is pressed,
it indicates that there is not a 7702 module installed in the mainframe.
2. With “CLOSE:SINGLE” displayed, press ENTER to display the prompt to close a
channel (CLOSE CH: XXX).
3. Using , , , and , key in the three-digit channel you want to select.
4. Press ENTER. The channel closes and the CHAN annunciator turns on.
An invalid channel cannot be closed and will cause one of the following error messages to
be briefly displayed:
INVALID CHAN — This message indicates that the channel is not a valid measurement
channel. The following actions will cause this error:
• Trying to close a paired-channel while on a 4-wire function. For the Model 7702,
channels 1 through 20 are paired to channels 21 through 40 for a 4-wire function.
If, for example, you try to close channel 22 while on the
Ω
4 function, the
INVALID CHAN error will occur.
• Trying to close a switching module channel that does not exist.
Close next
measurement
channel
Close previous
measurement
channel