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| MHS-5200A function generator teardown / review / reverse engineering |
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| SaabFAN:
This is how the Sine-Wave looks right now on my Rigol 1104Z: Unfortunately, I only have a 75Ohm Terminator right now (50Ohms is on its way). Strangely, my PM3320A shows different voltages, while the shape on both instruments looks identical. Probably have to recalibrate again. (Which wont yield the best results, considering what I have here: MHS-5200A Signal-Gen and a XR2206 based analog Signal Generator. So disregard my earlier comments about changes of the amplitude. I also took some measurements of the square-wave: It has so much ringing, it doesn't even settle at frequencies above 2Mhz. |
| devttys0:
Yeah, the square wave overshoot/ringing is atrocious, even at very low frequencies. :-\ |
| SaabFAN:
What could the reason be to fail like that at creating a Square-Wave? Too slow slew-speeds? For comparison: My 74AC14-Based TDR running at 2.432Mhz (RC-Oscillator driving 5 gates with 220Ohm-Resistors to give 50Ohm output-impedance on a not very RF-ish vero-board - no Ground-Plane and components connected with bare wires and solder-"traces" on the bottom-side) vs. the MHS-5200A. Both are pumping their energy into a 75Ohm termination-resistor via a 50cm 50Ohm Coax-Cable. The Signal-Gen is set to 5V Amplitude and 0% Offset. |
| commie:
The reason this sig.gen. outputs sine distortion on the higher amplitudes and frequencies is because the output op amp(which is possibly a current feedback type) is going into slew rate limiting, which is why you get a triangular wave as the gen. approaches max. bandwidth/amplitude. Actually, I would expect this kind of gear to be crap, which it is, it's written all over the product. Why do you guys buy this shit? :popcorn: |
| wd5gnr:
Nice work. Maybe we just need to rebuild the output stage. |
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