Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
joeqsmith:
--- Quote ---If the signal exceeds 1.5V, you will not be able to measure it, since the CDF query voltage ranges only from -1.5V to 1.5V.
--- End quote ---
--- Quote ---(The official software soft-clips the signal to 1.1V, but this isn't a hardware limit.)
--- End quote ---
When you applied your 5V signal, I assumed you did not have the software limit. What does the GigaWave read? 1.5V? I assume with X1, you can force the trigger and would think it would limit at the +/-1.5V.
--- Quote ---Any damage to the frontend is covered by warranty.
--- End quote ---
If it were a handheld DMM that should be somewhat robust, you should have some concern. If I damage your scope with my testing, it will not be intentional. With all the high voltages I play with, I have never damaged any of my equipment. I did loose a good amplifier last year when working with those microwave horns without a wrist strap. Who would have guessed.... :palm:
***
Attached showing the data from last night after updating the fitter.
SJL-Instruments:
The reading would depend on how you processed the data - all of the returned CDF values would be zero, indicating that the signal exceeds the requested upper bound. The official software would clip it to 1.1V.
What’s your setup for the overnight data? Internal trigger with all inputs shorted?
joeqsmith:
--- Quote from: SJL-Instruments on January 30, 2024, 09:19:15 pm ---What’s your setup for the overnight data? Internal trigger with all inputs shorted?
--- End quote ---
Marconi 2024 (1GHz) to Wilkinson to GigaWave to PC to LabView
See PE2012
https://www.pasternack.com/sma-4-way-50-ohm-rf-power-dividers-category.aspx
External trigger.
SJL-Instruments:
--- Quote from: joeqsmith on January 30, 2024, 10:00:13 pm ---Marconi 2024 (1GHz) to Wilkinson to GigaWave to PC to LabView
See PE2012
https://www.pasternack.com/sma-4-way-50-ohm-rf-power-dividers-category.aspx
External trigger.
--- End quote ---
Got it - so in #205, you're plotting with the mean waveform subtracted?
Since the small spikes you're seeing are on CH2 and CH3 only, this rules out a timing problem.
We've been unable to reproduce the small spikes so far using the same signals.
It's odd that they only occur on CH2 and CH3. You can try running with a falling-edge trigger to see if the spikes then appear on CH1.
Internally, CH4 has a different polarity from CH2/CH3 and is inverted in firmware. A falling-edge trigger will invert CH1 internally.
joeqsmith:
I wasn't too concerned by this bit of noise.
--- Quote from: SJL-Instruments on January 30, 2024, 11:56:05 pm ---Got it - so in #205, you're plotting with the mean waveform subtracted?
--- End quote ---
That data represented about an hour. I took the mean for each individual channel for that entire 1 hour data set. I then subtract each mean from their respective channel.
--- Quote ---Since the small spikes you're seeing are on CH2 and CH3 only, this rules out a timing problem.
We've been unable to reproduce the small spikes so far using the same signals.
It's odd that they only occur on CH2 and CH3. You can try running with a falling-edge trigger to see if the spikes then appear on CH1.
--- End quote ---
The previous data was taken using the falling edge but I can repeat the test with the rising edge if you like. I'm not big on changing multiple variables at once but I'll double the input voltage as well. Manual states edge amplitude is 200mVp-p min and my test signal was about 250mVp-p. Still you don't think it is timing. Also, the scope was off all day as well and the office is much cooler.
--- Quote ---Internally, CH4 has a different polarity from CH2/CH3 and is inverted in firmware. A falling-edge trigger will invert CH1 internally.
--- End quote ---
Sharing a bit of insider information....
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