Synchronizing Two DMMs with an External Trigger
Downloads
Filename: dmmsync_externaltrigger.vi
Requirements: View
This virtual instrument (VI) synchronizes two National Instruments digital multimeters (DMMs). The same transistor-transistor logic (TTL) trigger needs to be connected to the front connector of each DMM or passed through the PXI trigger lines, and this TTL trigger initiates acquisitions on both DMMs at the same time. Since the onboard clocks on each of the DMMs are not shared or phase-locked, this synchronization is not a true hardware synchronization. However, the LabVIEW code configures both DMMs for the same measurement parameters so both DMMs will operate with the same functionality as long as they are the same model. A star configuration for the triggering is recommended, but a daisy chain configuration also works. Make sure that both DMMs have been initiated and are waiting on the trigger before the trigger is sent.
Requirements
Filename: dmmsync_externaltrigger.vi
Software Requirements
Application Software: LabVIEW Base Development System 8.5
Hardware Requirements
Hardware Group: Digital Multimeters (DMM)
Driver: NI-DMM 2.8
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This example program (this "program") was developed by a National Instruments ("NI") Applications Engineer. Although technical support of this program may be made available by National Instruments, this program may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this program with each new revision of related products and drivers. THIS EXAMPLE PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).
