(19-11-2017, 11:12 AM)Bonky Wrote: Pressing the 'cal' button is meant to produce several traces on the screen and one uses a trimmer tool on the probe body to get the traces as they should be (the manual is very good here). Only the focus and intensity controls work at this setting; nothing else does.
What 'cal' button?
Nothing else works?
Not according to the manual!
Probe adjustment
The TIMEBASE switch should be in the 0.2ms/cm position. The input coupling is set to DC. If the attenuator sensitivity is set to 5mV/cm (variable control to C), the display will have a height of 4cm when a x10 probe is being compensated.
That doesn't agree with what you wrote! However:
Component Tester
By simply pressing a single pushbutton, the HM203 can be switched into test mode without actually affecting the oscilloscope measuring set-up.
Now that sounds more like what you are describing!
There is NO 'cal' button!
As for your half-amplitude calibration waveform, that is correct! The waveform is a 50/50% square wave so it only sits at 0.2V for 50% of the time. Your meter is averaging out the signal it sees so, correctly, displays 0.1V, which is 50% of 0.2V.
If viewed correctly on the screen it would measure 0.2V peak.
