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How to product a arbitrary waveform with 1uV amplitude?

Question asked by alex-emc on Sep 22, 2011
Latest reply on Sep 30, 2011 by alex-emc

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Dear All ,
     One of my customer want to create a arbitraty waveform ,and the frequency range from 1Hz to 100kHz ,and the amplitude is as low as 1uV? How to do it?
     I have tried to attenuate the output signal of 33220A with an attenuator ,but the result I got is Noise ,so I do not konw how to do it? Is there somebody can give me some suggestion? such as new device or new method? Thanks a lot
                  Alex

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lhornburg Sep 26, 2011 12:52 PM
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I don’t know why a good, shielded attenuator wouldn’t work. What were you using to try to measure the signal. A scope will DEFINITELY show just noise with a 1-uV input signal.
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alex-emc Sep 27, 2011 11:19 PM
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The 3458A ，8.5 digit Digital multimeter,was used, and I think 1uV voltage can be measured, but I got nothing ,only noise. So i want to konw how to creat a uV Arbitrary vaveform? Thanks a lot
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lhornburg Sep 28, 2011 10:41 AM
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Can you describe in detail how you are attenuating the signal? Also I would like to know how you have setup your 3458A to make this measurement, I am very familiar with this product as well and you may not be measuring what you think if it is not configured correctly. What type of signal are outputting from the function generator and at what frequency? I would suggest trying a standard sine wave first, that way you know what you should be seeing. Once you get that working correctly then I would try your arb.
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alex-emc Sep 28, 2011 6:38 PM
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The sine wave was used,and the measurement was done by my colleague,and I was not very clearly. So could you give me some suggestions to setup 3458A, and we will try again. and Thank you for your reply.
Alex
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lhornburg May 11, 2016 10:16 AM
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Even with a 3458A you are going to have issues. I have a sample program under a different forum post showing how to digitize using C++ but the measurement error is going to be roughly +/- 5 micro volts so that's not gonne be much help.

You could use the AC Synchronous mode to measure this since it is a repetitive signal but even then your error is going to be roughly +/- 1 mirco-volt, and that's using a repetitive sine wave for your output. You cannot use the AC SYNC mode if the signal is not repetitive and since you have a constantly changing frequency I think you may run into problems. To get into this mode use the SETACV SYNC command, the results are in AC VRMS.
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alex-emc Sep 30, 2011 6:17 PM
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Thank you for your help, it is very useful.
Best regards,
Alex
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How to product a arbitrary waveform with 1uV amplitude?

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