Keithley 2790, Reference Manual, Page: 73 / 568

2-16 Model 2790 SourceMeter
®
Switch System Reference Manual
OPEN key
The OPEN key has two options to open channels: ALL and MULTI. The ALL option simply
opens all channels in the mainframe. The MULTI option opens only the specified channel.
All other closed channels remain closed.
Figure 2-7 summarizes OPEN key operation.
OPEN: ALL — Perform the following steps to open all channels in the mainframe:
1. Press the OPEN key to display “OPEN: ALL.”
2. Press OPEN again (or press ENTER) to open all channels.
OPEN: MULTI — Perform the following steps to open only the specified channel:
1. Press the OPEN key. The “OPEN: ALL” message will be displayed.
2. Press the or key to display the “OPEN: MULTI” message.
3. Press ENTER to display the prompt to open a channel (OPEN MLT:XXX).
4. Using , , , and , key in the three-digit channel you want to select.
5. Press ENTER to open the channel.
klqb
If the channel you open using OPEN: MULTI is a 7702 system channel (channel
number displayed on the Model 2790), the channel will open, but the system
channel number will still be displayed (see
“Multiple channel operation
anomalies (7702 only),” page 2-19 ).
Figure 2-7
Multiple channel operation — opening one or all channels
CLOSE OPEN
Press OPEN key
OPEN: MULTI OPEN: ALL
Display MULTI option
and press ENTER
OPEN MULT:XXX
Specify channel number
(XXX) and press ENTER
Display ALL option
and press OPEN again