EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: maxwell3e10 on December 04, 2019, 03:35:31 am
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Does anyone have a Keysight B2961A/B2962A power source? I am curious how well it works, in particular for making sine waves?
In principle, it should have high dynamic range corresponding to 6 digits of vertical resolution. But the time sampling is relatively slow, 100 kS/sec. So I am curious how clean a 1 kHz sine wave would be on a spectrum analyzer?
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Its comparable to the built in 10bit wavegen on their scopes as a signal/voltage source, but with significant roll off in noise above 50kHz. Varying settling times for the many possible combinations of voltage and current ranges don't have significant effects at those low frequencies when driven into trivial resistive loads.
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So someone does have a B2961A! It should be better than a 10 bit generator if it really uses the full dynamic range and doesn't have too much time jitter. They make a big deal about various filters, but OK, one can always add a filter to any generator. The question is how clean is the signal in the 1Hz-1kHz band.
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Hello,
in datasheet:
"
Arbitrary Waveform Generation Capabilities
....
THD
Voltage Source -90 dB 3 , Current Source -90 dB 4
...
3. ±1 V, ±10 V, ±180 V, open load
4. ±1 uA 100 kΩ load, ±10 uA 100 kΩ load, ±10 mA 100 Ω load
"
Best regards
egonotto
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Yes, that's not bad, but not as good as a low distortion audio generator (<100dB). I guess the king in this area is the Audio Precision APx555, -120dB
The advantage of B2962 is that it can drive higher currents, but the spec only refers to fairly small currents, is it too conservative?
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Yes, that's not bad, but not as good as a low distortion audio generator (<100dB). I guess the king in this area is the Audio Precision APx555, -120dB
The advantage of B2962 is that it can drive higher currents, but the spec only refers to fairly small currents, is it too conservative?
It does not achieve those specifications for general signals, your requested example of a 1kHz sine ends up with the harmonics at 60-65dBc when using their inbuilt waveform.
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Interesting. So its not only not conservative, but is actually worse than the specs?! What current were you using? Thanks for doing the test.
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Interesting. So its not only not conservative, but is actually worse than the specs?! What current were you using? Thanks for doing the test.
There are probably some specific frequencies and conditions under which it will achieve the banner figure, but I have no idea what they are. When so many audio specifications are based around a 1kHz test tone that performance is what's interesting in those applications. Current ranges of 1mA, 10mA, 100mA, or 1A or signal amplitude didn't change the result significantly, frequency had more effect.