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2651A ADC Memory and timebase

Model 2651A
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Blake.Edwards
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Joined: March 20th, 2014, 5:28 am
Country: United States

2651A ADC Memory and timebase

Post by Blake.Edwards » March 20th, 2014, 5:57 am

I am considering using a 2651A to measure the inrush current of a circuit when power is applied. The power will be applied with the 2651A; voltage is 32VDC and expected current is 3.5A or less for the first second and then 2.5A or less steady state after the first second. How many datapoints can the 2651A store over a period of about 3 seconds from source turn on, what measurements can be made by the instrument and can the data be downloaded for post processing on a PC?

Also, can this instrument be used to source voltage and then be triggered externally to begin storing current data with the ADC?

Thanks
Last edited by Blake.Edwards on March 20th, 2014, 6:29 am, edited 1 time in total.

Andrea C
Keithley Applications
Keithley Applications
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Re: 2651A ADC Memory and timebase

Post by Andrea C » March 20th, 2014, 6:28 am

Hi,

The 2651A has two dedicated reading buffers; one for voltage and one for current.

If including both timestamps and sourcevalues in the buffers, they can hold 60,000 readings each.

If we disable timestamps and sourcevalues, the number of readings increases to 140,000.

In addition, you can allocate some of the runtime memory to act as a reading buffer for situations where the size of the dedicated reading buffers is not large enough.

Acquiring data for 3 seconds should be supported very well.

What sort of sample rate do you desire?

Andrea

Andrea C
Keithley Applications
Keithley Applications
Posts: 1323
Joined: October 15th, 2010, 10:35 am
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Re: 2651A ADC Memory and timebase

Post by Andrea C » March 20th, 2014, 2:59 pm

Hi Blake,

The external triggering you have described is also supported.

There is what we call an asynchronous trigger model so that timing control over sourcing can be independent of timing control over measuring. You can even start measuring before sourcing to capture transient response to the sourced value.

Andrea

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