Cursor Control for Tektronix 2230 Oscilloscope
If you have been lucky enough to
pick up a Tektronix 2230 Oscilloscope off Ebay,
you may have been unlucky enough
to get one with a defective cursor control.
A24 Cursor control Board Pt No. 670-9701-00
Dual 10K Pot plus Switch Pt No. 311-2285-01
I have a
collection of these with
various fails, no switch, sticky switch, jerky pots, no pot action,
All of which essentially make the measurement function
for replacements but
apart from risking another scope purchase for parts these controls are
no longer available.
uses a Bourns optical
encoder, microprocessor and dual D/A to exactly mimic the original
function of the cursor control.
exactly as the original, press the knob for cursor change
and menu select.
Technical details :
64 pulse encoder, circuit clocks
on both edges so 128 pulses per revolution.
Dual 8 bit DAC counts to
pulses for each cursor
think you can tell the
difference between this and the original part, sensitivity and accuracy
is identical and in my opinion more stable.
The 2230 does have a tendency to lose track of the cursors once in a
while,thats a design glitch, this won't cure that.
is simple, does
require an extra 5 Volt pick off from the board.