Series 3700 System Switch/Multimeter User's Manual
Section 4: Close-open overview
3700S-900-01 Rev. C / July 2008
4-11
Corresponding remote commands for switch with DMM operations:
ICL command
Action performed
dmm.close()
Equivalent of channel.exclusiveslotclose except it also prepares the
DMM for taking a measurement on the function associated with the
item. It closes any needed backplane relays and paired channels. It
opens channels and backplane relays that will interfere with
measuring on the specified item.
dmm.open()
It opens the items that would get closed with a dmm.close().
When you perform a switch with DMM operation, the Series 3700 also closes
the appropriate analog backplane relays to connect to the DMM Input and/or
DMM Sense terminals. For 2-wire or two-pole DMM operations, the Series 3700
closes only the analog backplane relay to connect to the DMM Input terminal.
For 4-wire or four-pole DMM operations, the Series 3700 closes the analog
backplane relays to connect to the DMM Input and DMM Sense terminals.
The following figure shows an example of how the channel is connected to the
DMM Input of the Series 3700 for a 2-wire DMM operation. Assume a switching
module with 20 channels is installed in Slot 1 of the mainframe and a 2-wire
DMM operation, such as DC Volts, is selected. When you perform a DMM close
operation on Channel 1001, the Series 3700 closes Channel 1001 and Channel
1911 (the backplane isolation relay) to connect the channel to the DMM Input
terminal.
Figure 4-3: Two-wire function