Replacement
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,
noisy action.
All of which essentially make the measurement function
void.
I looked
for replacements but
apart from risking another scope purchase for parts these controls are
no longer available.
SO.......an
alternative:
This design
uses a Bourns optical
encoder, microprocessor and dual D/A to exactly mimic the original
function of the cursor control.
It operates
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
1024
pulses for each cursor
I don't
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.
Installation
is simple, does
require an extra 5 Volt pick off from the board.
Limited
quantity available
Video