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34461A Taking periodic samples

Question asked by JasonAG on Jul 5, 2019
Latest reply on Jul 5, 2019 by Tardz

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Hello,

I would like to take periodic measurements spaced 20 ms apart using the 34461A. I am using previous code I wrote for a 34410A but found the 34461A does not have a sampling:source option so you can only set the trigger delay to determine the spacing between samples. On the 34410A I just set the sampling interval to longer than the sampling time so I was able to get a deterministic spacing between samples.

With only the trigger delay the time between samples becomes (Trig_Delay+Sample_time), but sample time isn't constant, so you have to approximate(?) the timing between samples. Is there something here I am missing or is this a loss of functionality between the older 34410A and the newer 34461A?

Thanks,
Jason

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Tardz Jul 5, 2019 2:43 PM

Hi, the SAMPLE:SOURCE option is for 34465A and 34470A Below, from operating manual of 34460A (34460-90901).

The 34465A is the replacement product of 34410A, but unfortunately, not the 34461A (replacement product of 34401A).

Yves

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JasonAG @ Tardz on Jul 5, 2019 6:16 PM

Hello,

Thank you for responding. Is there any work around for taking periodic measurements on the 34461A then other than approximating the sample time?

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Tardz @ JasonAG on Jul 5, 2019 8:21 PM

Hi,

You may use sample:count up to 10000 (maximum for 34461A), with fixed paramaters and range, but you don't have direct control for interval time like for 34410A.

I thinks with right parameters value (NPLC, nb digits, chan delay=0 autozero=off etc) to have near 20ms per sample, it's possible to have stable sampling rate, but 10,000 sample at 20ms per sample, the command "fetch?" will return you only 200sec of measurement time.

I don't have an 34461A but I tested with my 34970A (DMM function), with AUTO-ZERO OFF, CHAN DELAY 0, fixed range, I had a stable sampling rate. I have done measurement of 40 groups of reading of 1000 samples and sampling rate result was mean=19.662ms standard deviation = 9.89µs.

I hope that some information can help you.

Yves

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3 Replies

Tardz Jul 5, 2019 2:43 PM
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Hi, the SAMPLE:SOURCE option is for 34465A and 34470A Below, from operating manual of 34460A (34460-90901).
The 34465A is the replacement product of 34410A, but unfortunately, not the 34461A (replacement product of 34401A).

Yves
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- JasonAG @ Tardz on Jul 5, 2019 6:16 PM
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  Hello,
  
  Thank you for responding. Is there any work around for taking periodic measurements on the 34461A then other than approximating the sample time?
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  - Tardz @ JasonAG on Jul 5, 2019 8:21 PM
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    Hi,
    You may use sample:count up to 10000 (maximum for 34461A), with fixed paramaters and range, but you don't have direct control for interval time like for 34410A.
    I thinks with right parameters value (NPLC, nb digits, chan delay=0 autozero=off etc) to have near 20ms per sample, it's possible to have stable sampling rate, but 10,000 sample at 20ms per sample, the command "fetch?" will return you only 200sec of measurement time.
    
    I don't have an 34461A but I tested with my 34970A (DMM function), with AUTO-ZERO OFF, CHAN DELAY 0, fixed range, I had a stable sampling rate. I have done measurement of 40 groups of reading of 1000 samples and sampling rate result was mean=19.662ms standard deviation = 9.89µs.
    
    I hope that some information can help you.
    
    Yves
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34461A Taking periodic samples

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