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| in the search for a High precision SIG GEN |
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| sdouble:
Dear all, I'm currently looking for a high precision signal generation. I'm only after square waves. Rise time and decay are important : 2ns 10-90% at worst. The max frequency is not an issue : I typically operate from 1kHz to 1 MHz. What is really important is the amplitude accuracy. I need to explore the response of my circuit to amplitude varying from 5 mV to 5 V. The major issue is to reach the needed accuracy in the 5 mV to 500 mV range where 0.5% accuracy is needed Any clue about the device which could fit the bill ? I need such a device for a work project. I'm not looking for a cheapo. Thx for your help |
| sdouble:
no idea ? Anybody ? My specs are too demanding ? |
| nctnico:
What you are after is a network analyser but an oscilloscope with frequency analysis (FRA / Bode plot) will also do. In both cases the signal going in is compared against the signal going out. So the absolute level doesn't matter. Only thing you'll need to check is gain error between channels which is easely performed by connecting both input channels to the output and see if the measure amplitudes match within your required specification (if not, you could even compensate for the error). |
| egonotto:
--- Quote from: sdouble on April 10, 2024, 07:30:48 pm ---...... The major issue is to reach the needed accuracy in the 5 mV to 500 mV range where 0.5% accuracy is needed .... --- End quote --- Hello, that will be a problem. 0.5 % of 5 mV is 25 uV. Noise already plays a role here. Even the almost 10000 € expensive Siglent SDG7032A only has: "Amplitude accuracy ± (1% + 1 mVpp) (Condition & Note: 10 kHz sine, 0 V offset)" Best regards egonotto |
| noisyee:
For your reference, the oscilloscope calibrator golden standard fluke 9500b, it's square wave amplitude accuracy is 0.1%, but only from 10 Hz to 10 kHz. 0.5% amplitude accuracy for 1MHz square wave is a demanding requirement. That means ~0.5dB flatness of accuracy up to ~10MHz. Some function gen may have that level of response flatness but not always been specified in its datasheet. Are you overlooking the accuracy requirement? Or you really need is a nearly flat square wave? If absolute accuracy is not that important, I'd recommend Keysight 33500B or Siglent SDG6000X, which I had verified its square wave flatness. |
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