This is the best and most flexible setup since you can use any of the 407x DMMs, or the 4065 DMM. This will work for configurations where a PXI chassis and a separate SCXI chassis are used. It will also work with the PXI-1050 combo chassis which has both PXI and SCXI slots.
There are two main options to establish connectivity between the DMM and Switch. First of all you can connect your DMM module directly to the backplane of the SCXI chassis using an SCXI-1357 High Voltage Backplane Adapter Kit. A second option is to use a SCXI 1362 Adapter Kit. Both of these options will allow you to control the switch modules with the DMM. These options are explored in more detail below.
Using the SCXI-1357
The SCXI-1357 can be used to control a number of different switches and also includes a built in high-voltage analog bus. The switch modules that can connect with a SCXI-1357 are:
The key component is the auxiliary cable which connects the AUX I/O port of the DMM to the AUX I/O port of the SCXI-1357 backplane connector.
Using the SCXI-1362
If your switch module cannot connect to the SCXI-1357 then you can use the SCXI-1362 Adapter Kit to connect to your DMM. The SCXI-1362 works much like the SCXI-1357 in that it uses the AUX I/O port to communicate digitally with the DMM. The switch modules that can be used with the SCXI-1362 are:
Setup 2 (PXI-1052 Combo Chassis with a DAQ card)
If software timing is adequate and triggers will not need to be shared between the DMM and Switch then installing a DAQ card with local bus connectivity in the right most slot of the PXI chassis will give you the ability to control the SCXI switch modules without having to make an external digital connection. The following M series modules have a part number that includes the local bus.
Setup 3 (PXI-1052 Combo Chassis)
The PXI-1052 chassis has an AUX connector built-in on the SCXI side, but it cannot be used to control the switches in that chassis or to route trigger signals from a DMM. Therefore, a card with the local bus connections must be used if hardware scanning is desired. A few options are: use a DAQ card with local bus connectivity, or use the PXI-4060 DMM module.
Analog Signal Connections Additional InformationWhen using the switch as a multiplexer (i.e. 1x32), only one channel is connected to the DMM. On the other hand, when a matrix configuration (i.e. 2x8 or 4x8) is used, different physical connections are required between the ‘com’ channel(s) of the switch and the DMM depending on the application.
For example, when taking a series of 4-wire resistance measurements, one might consider a 4x8 (or similar) matrix. In general a 4 wire MUX would be a better option, but either could work. In the case of a matrix, each one of the four ‘com’ channels on the switch will connect with one of the four connectors on the front panel of the DMM. Note that each of these connections must be done externally. Moreover, the only possible ‘internal’ connections between the switch and DMM are digital signals.Digital Synchronization Connections Additional InformationIn a large chassis with multiple PXI trigger busses, it is necessary to configure the trigger bus in Measurement & Automation Explorer (MAX) if the switch and DMM do not share the same trigger bus. Please see the additional links section for more information on how to configure the trigger bus.
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