Hello everyone,
I am using matlab and agilent multimeter 3458a with GPIB-USB cable. I need to read the value of the current (DCI) in a specific instant during my program. for example in 1:30 reading the first value, in 2:45 reading the second value....etc.
Anyone has an idea how to deal with it.
Thank you
I am using matlab and agilent multimeter 3458a with GPIB-USB cable. I need to read the value of the current (DCI) in a specific instant during my program. for example in 1:30 reading the first value, in 2:45 reading the second value....etc.
Anyone has an idea how to deal with it.
Thank you
> {quote:title=student ch wrote:}{quote}
> Hello everyone,
>
> I am using matlab and agilent multimeter 3458a with GPIB-USB cable. I need to read the value of the current (DCI) in a specific instant during my program. for example in 1:30 reading the first value, in 2:45 reading the second value....etc.
> Anyone has an idea how to deal with it.
> Thank you
Hi,
You are asking a question about a multimeter in the RF and Microwave Network analyzers forum - in other words in the wrong place. The multimeters forum
Digital Multimeters
is a much more appropriate Keysight forum to ask.
You might also consider joining the +volt-nuts+ mailing list
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
I must be one of the few subscribers to the volt-nuts list that does *not* own or have access to a 3458A. The list has a lot of subscribers who are professional metrologists that use 3458As on a daily basis. It also has a number of hobbyists who own a 3458A - some own several 3458As.
I suggest that you phrase your question properly wherever you seek help, as nobody is likely to know what 2:46 is. It could be interpreted as
* 2 hours and 46 minutes
* 2 minutes and 46 seconds
* Just past a quarter to 3 in the morning
* Just past a quarter to 3 in the afternoon.
I would also suggest that you state
* The firmware version of the 3458A
* The MATLAB version you have.
* The uncertainty in time and current that you need
* Options the instrument has (probably not relevant here, but in general a good idea)
* It could conceivably be useful to state your mains frequency (50 or 60 Hz) since I assume that the instrument integrates the measurement over a number of power line cycles.
Within reason, the more information you give about your problem the better.
There are a number of companies producing 8.5 digit multimeters (Keysight, Fluke and Keithley being 3 of them), but despite the age of the 3458A design, it still seems to be the instrument of choice among those wanting to make accurate voltage/current/resistance measurements.
PS, if you fancy a laugh, there's a great video on YouTube
https://www.youtube.com/watch?v=HfxpJCdgVwc
of some idiot measuring the noise on a 6.5 digit 3457A by looking at how much the digits change as he connects the meter onto his lab power supply. The fact the power supply is likely to be considerably less stable than even a 6.5 digit multimeter seems to have missed on him. I think the same guy has a video on the 3458A too. I don't know why, but YouTube seems to be a magnet for people creating videos about things they know very little about.
Dave
Edited by: drkirkby on Jul 28, 2015 9:42 AM