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DPScope - Build Your Own USB/PC-Based Oscilloscope

Step 30Assembly Step 18: Probe Calibration Output

Assembly Step 18: Probe Calibration Output
Take the two hookup cables and solder them into the board and onto the solder pads on the backpanel as shown.
 
Make sure to connect the hole labeled “CAL” with the backpanel pad going to the “CAL” hole on the backpanel, and the same for “GND”.
 

Put the two terminal turrets (not shown) into the holes and solder them on. The long part of the turret points to the outside of the backpanel.
 
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