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In Reply to: RE: My HK Citation2 meter quit working posted by Jim McShane on June 14, 2015 at 18:12:32
hI Jim, thank you for the tip. If I put in a test jack do I just run the meter supply wire, the grey wire I believe, to the jack? Cheers, Dak
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You need one test point for each meter terminal. If you look at the meter you'll see one lead comes from the selector switch and the other lead goes to ground through a resistor.
You need a tip jack to access the lead from the switch and one to connect to the meter lead that goes to ground. The wires go to the jacks and no longer connected to the meter, you are correct. For the best accuracy you need to get a direct ground connection, so bypass or remove the 300 or 330 Ohm resistor that goes from the meter to ground.
Then when you plug in your DMM to the jacks read the bias voltage, the switch allows you to measure any of the four tubes. And it's way more accurate.
Thank you for the help, Jim. I did install the tip jack right next to the meter and soldered the red wire to it. I checked the reading at the cathode of the power tube and compared it to the reading at the tip jack and found the difference to be negligible. So, even with the resistor in place its effect is not very much. Cheers, Dak
That's correct about the resistor. I'm glad to hear it all worked out for you.
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