Synchronizing Two DMMs with an External Trigger
PrintDownloads
Filename: dmmsynch_externaltrigger.vi
Requirements: View
This virtual instrument (VI) synchronizes two National Instruments digital multimeters (DMMs). Since there is no connection between the two DMMs and since the two onboard clocks 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. Therefore, both DMMs operate with the same functionality. The two DMMs must be the same type. The same transistor-transistor logic (TTL) trigger needs to be connected to the front connector of each DMM, and this TTL trigger initiates acquisitions on both DMMs at the same time. A star configuration 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 external device sends the trigger. The DMMs perform a multi-point, asynchronous acquisition.
Requirements
Filename: dmmsynch_externaltrigger.vi
Software Requirements
Application Software: LabVIEW Full Development System 8.0
Language(s): LabVIEW
Hardware Requirements
Hardware Group: Digital Multimeters (DMM)
Hardware Model: PCI-4070, PXI-4065, PXI-4072, PXI-4071, PXI-4070
Driver: NI-DMM 2.7
Reader Comments | Submit a comment »
Legal
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/).