January 7, 2010
about 3 years ago
I’m having a bit of a problem with the Z output. I have built a XYZ monitor out of an Tek waveform monitor which uses a scope CRT. I have built deflection amps after this schematic: http://www.electronixandmore.com/project/7.html and it works great!
The instrument originally had a Z-input from the main processor, and it’s current-controlled. I added a NPN transistor with 825 ohm in series, this is what the apparatus originally used for blanking/drawing. Controlling the transistor from my signal gen works just fine, i can get good blanking on the CRT.
Without blanking: http://ragelse.com/i/fOb72Nh
With blanking connected: http://ragelse.com/i/SqS82Nh (sorry for the shaky picture)
Connecting the ZLINE og ZINV to my transistor, i get a strange picture. With my transistor, the beam is active high, so i need to use the ZINV output on the board, but the picure is wrong. I can see the image, but maybe only 20% of the segments are legible, like the signal on the Z channel is a bit off in timing. I don’t have any other scope with a Z input that i can test this on, any advice on my problem here ?
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