I made up a little black box with three pots on it for all my vector work. 1k pot on each of the X,Y,Z allows for complete control and should work nicely for your Z problem because that's the scope i started off with before moving onto using a dedicated HP display for my vector stuff. Oh, yes, you do need the inverter too for the 475, 4069 is it? I forget, it was just one cmos chip though. Martin. Guddler's Domain http://www.guddler.co.uk On 10 Feb 2007, at 18:09, Matt Rossiter wrote:
I'm using a Tektronix 475 Oscilloscope and, of course, I use XY mode for testing to see if the X and Y signals look good on the screen. There is an external Z axis channel in the back, but I've never gotten it completely to work. Someone once told me that I need to use an inverter to invert the signal into the probe - which sort of works, but I still see the vector retrace lines. Is it possible to completely blank out the Z signals so that the picture looks the way it's supposed to?
Thanks
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