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MHS-5200A Serial Protocol Reverse Engineered
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janoc:
It is slew-rate limited and heavily downpass filtered.

 This article actually describes two mods that improve the performance somewhat:
http://www.analogzoo.com/2015/08/fixing-the-mhs-5200a/

I have done it (replaced the opamps and did the "cheap" mod on the filters) and it works better, but I still get distortion at maximum amplitude. That is probably due to the insufficient supply voltage, though.

janoc:
I was playing with some HF filters today and thought about trying the sweep function on the generator to check the filter characteristics. Of course, I am aware that with the variable amplitude of the sig gen it would be only very approximate, but that's ok for my needs atm.

However, does anyone know how to synchronize the sweep with a scope? I have tried all sorts of things - like feeding the scope trigger output into the input BNC on the sig gen, probed the TTL outputs on the back to see whether there is a sweep start signal or something but nada.

The other thing I have found seems like a bug - when I set the sweep limits (SET SWEEP FREQ1 and SET SWEEP FREQ2) only the lower limit seems to be respected and the generator always sweeps up 25MHz. Is that normal behavior?
briselec:
If you use channel 1 for sweep, set channel 2 to output a square wave with a period equal to the sweep time.  Connect channel 2 to one of the channels on your scope and use that as the trigger.

TTL OUT1 and TTL OUT2 appear to output a square wave at the same frequency as channel 1 and channel 2.

When a channel is generating a signal that doesn't agree with the settings, try turning the unit off and back on.
Usually fixes it. Definitely has some bugs in it.

janoc:
Hmm, didn't think of that. However, isn't that going to drift all over the place? The trigger vs. the sweep start, I mean.

briselec:
The display of the sweep will drift slightly.  The settings resolutions aren't fine enough to precisely match the 2 channels.




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