Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
battlecoder:
--- Quote from: Serhii74 on September 22, 2023, 01:37:07 am ---Dear friend!
The problem with underestimation of signal level measurements and distortion of the square wave shape at frequencies up to 1 kHz in AC mode has been resolved.
It lies in the incorrect installation of the coupling capacitor. It is set to 740 pF, but should be 0.1 mF.
After replacing the capacitors, any signal shapes and amplitudes are not distorted.
You will need to replace the circled capacitors with ceramic capacitors of the same size 0.1 microfarad 100 volts.
--- End quote ---
Thanks for posting here. What's the footprint? Is that a 0805 cap?
Serhii74:
0805 or 1206
indman:
--- Quote from: Serhii74 on September 22, 2023, 01:37:07 am ---Photo 5 measures the shape and amplitude of the voltage in the socket in RMS mode and compares it with a multimeter.
--- End quote ---
I don’t see your photo 5?
Rooster Cogburn:
--- Quote from: Serhii74 on September 22, 2023, 01:37:07 am ---It lies in the incorrect installation of the coupling capacitor. It is set to 740 pF, but should be 0.1 mF.
After replacing the capacitors, any signal shapes and amplitudes are not distorted.
You will need to replace the circled capacitors with ceramic capacitors of the same size 0.1 microfarad 100 volts.
--- End quote ---
So is it "0.1 mF" (100uF) or "0.1 microfarad" (100nF)?
Serhii74:
I don't know why photo 5 didn't load
I repeat the download.
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