how do I trigger based on a voltage level on the NI 4070 (DMM)

[LabVIEW_Joel]

I have the 4070 and I want to config the trigger to wait for a specific voltage value (like on a scope).  Any ideas on how to to do this?  Do you use pin 9 of the aux connector?

Thanks for your help!

joel

[Jeff_T.]

Hi Joel,

Unfortunately, the DMM's trigger input on the AUX pin is not available for analog triggering. The trigger inputs were intended for handshaking/scanning operations with switching devices.  They can also accept a TTL signal from other devices for synchronization purposes.  The KB below talks about Configuring a PCI-4070 DMM to Receive a Start Trigger.

Page 11 of the 4070 specifications also talk about which triggers are supported by this device.
4070 / 4072 Specifications

Best Regards,

Jeff Tipps
Applications Engineer
National Instruments

[Jeff_T.]

Joel,

One more thing.  Since the hardware does not support the analog triggering then we can always implement a software equivalent.  You could monitor the voltages that are being read by the DMM and throw out all readings until the readings are above a certain threshold.  This would have the "effect" of an analog trigger but without the hardware timing.  I hope this is an acceptable workaround and please let me know if you have any further questions on the matter.

Best Regards,

Jeff Tipps
Applications Engineer
National Instruments