Here's an example of how to properly use this device. This program was an Accelerated Lifecycle Test that used TWO FULLY LOADED 34790A's to monitor temperatures, and output voltages for must have been 30 individual units under test.
Now this one looks complicated, but it's not really. This is where I take measurements Sort, display, and save them to a file. SO most of the mess is sorting things for display. Follow the Error Cluster for the important parts that I will touch on.
Do appreciate you attached so useful sample, to a rookie like me who just jumped into LV for one month.
The 60 K-type thermoCoupling vi is already very close to my demand, to improve my daily work becoming more efficiently.
My great honor to be guided by a senior like you.
Followed your comment, I tried to setup the 34970A by the device in LabVIEW.
But something was not correct & I have no idea what's going wrong....
Please see another thread in forum by the link:
Have you met similar issue when you program it?
this sounds like a typical tradeoff between accuracy, number of channels, and time needed for measurement!
Does the manual of your device provide any "best practices" for your kind of problem?
No, I did not find the best practices in the manual.
Do you know anyway that I can make it faster?
@Shannara wrote:34901 multiplexer cards can read 60 channels per second.
I am pretty sure the specification is UP TO 60 channels per second.
Measurement speed is of the 34971A or 34972A determined by a few things here's some tips
BTW: There is a section in the manual that discusses this in detail.
Also PLEASE tell me you are NOT using any of the "EZ" vi's that come with the 3497xA LabVIEW drivers.
Thank you so much for the reply and with the brief answer.
1. I have used Auto range all the time because with the auto range I was getting the right answers and without auto-range, the measured values are not accurate.
2. I always used the high precision measurements so, I will change it to less digits of precision.
3. When I use the Aperature the measured values are shifting a little.
4. When I use the NPLC method, I find these are accurate measured values.
one thing I want to tell you that, When I use EZ.vi those are also taking time for measuring as same as the NPLC method. (because the EZ.vi LabVIEW code syntax is simple, it doesn't include any Aperature and NPLC) it includes only range and precision.
When I used Voltage config.vi, I find it better but the problem is the accuracy.
I request that, could you please sent me the link for the Manual which is for the coding, and as you said they explained about it.
Here's a link to the manual https://literature.cdn.keysight.com/litweb/pdf/34972-90001.pdf?id=1837993
Honestly I cant' find the section I was looking for, a lot has changed since these instrument were made by HP.
But read General Measurement Configuration through Custom A/D integration time and the full Voltage Measurement Configuration sections in the Features and Functions chapter and you might pick up a couple things.