Hameg 203-6 oscilloscope
Hi,
I have a problem with channel 2, the calibrator 2V p-p on channel 1 is OK, on channel 2 it reads 1.8V p-p. To check the input modules I Swopped CH1 to CH2 and CH2 to CH1. I got the same readings. So conclude the input modules are OK. Checked IC701 with IC702 there are voltage differences. The Y-Gain pot VR702 is turned full on (that is zero ohms reading across it) I have the schematic for the Hameg 203-6, but there no voltages shown on the diagram. I’ve changed some of the small electrolytic caps, the voltages at the P-Test point are OK. Also swapped the IC701 with IC702, but still the same readings. Does anybody have any clues? Many thanks. Rob. |
Re: Hameg 203-6 oscilloscope
There are quite a few manuals on the net. I seem to remember getting mine from the Hameg site.
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Re: Hameg 203-6 oscilloscope
Hi,
Yes I got mine from Hameg, had a look at other models they seem to have voltages marked on them but not the 203-6. Many thanks. Rob |
Re: Hameg 203-6 oscilloscope
Is the calibration source accurate ?
You could check independantly with a DC voltage source and a test meter ... dc |
Re: Hameg 203-6 oscilloscope
H'i (Hi,)
I think I've found the problem, on the Y-Pos II (VR705) pot it read over 700+ ohms and the value on the diagram should be 470 ohms, tested this by adding a 1.2K across VR705 to bring value down. Now it reads 2V pp. So now it's time to order a new 470 ohm pot. Thanks guys for the input. Many thanks, Rob |
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