Adding a New Meter to TC Gauge Controlelr

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Richard Hull
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Re: Adding a New Meter to TC Gauge Controlelr

Post by Richard Hull » Sun Feb 19, 2017 8:28 pm

This is exactly the scale that is on my meter. You seem to have done such a fine job on testing everything there is in the box previously, so I have little doubt an issue exists there.

The new meter has a polarity just like the old one. Are you sure you got it right? Try swapping the leads. Battery in to proper polarity? Can you adjust the TC tube current at all and see meter deflection. What resistance do you have in parallel.... if this is a 100ua meter? Does your replacement meter really read 100ua or 100ma? It must read 100ua or 200ua if you got an exact replacement.

Was there a resistor in series or parallel with the with the original defective meter?

You really need to check all this out and report fully. I bet the fix is simple either throught error or mis-connection. This controller is abysmally simple.

Richard
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Robert Dwyer
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Re: Adding a New Meter to TC Gauge Controlelr

Post by Robert Dwyer » Sun Feb 19, 2017 8:51 pm

The new meter is a 200ua meter. The battery is in the proper position. There is meter deflection when I adjust the current. Looking back at the old meter I did however find, a small resistor attached in series within the meter. Perhaps I should take the resistor and place it within the new one?
If we throw more money at it, it will have to work... right?

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Richard Hull
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Re: Adding a New Meter to TC Gauge Controlelr

Post by Richard Hull » Sun Feb 19, 2017 11:57 pm

You say there was a resistor within the old meter? Was it across the terminals or in series to one of them. Real important.

The classic metering required for all TC gauges was an odd ball 9mv (millivolt meter)!!! The manufacturer of the guage may have had the 200ua meter in the original factor altered to be a 9mv meter of the proper resistance.

Te beat goes on.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Robert Dwyer
Posts: 83
Joined: Sun Sep 04, 2016 9:34 pm
Real name: Robert Dwyer
Location: New Mexico

Re: Adding a New Meter to TC Gauge Controlelr

Post by Robert Dwyer » Mon Feb 20, 2017 12:43 am

The resistor was in series with on the black wire leading from the terminal to the glavanometer.
If we throw more money at it, it will have to work... right?

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Richard Hull
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Re: Adding a New Meter to TC Gauge Controlelr

Post by Richard Hull » Mon Feb 20, 2017 11:16 am

The correct meter for use with a T/C gauge is a 10 or 14 millivolts meter with a 55 ohm impedance. If you don't have this, in the end, you will not have a proper reading. Much of this is covered in the FAQ found in this forum FAQs

viewtopic.php?f=25&t=10098

The Bell Jar article can't be beat for a full explanation to the tubes and metering and how to roll your own T/C gauge for just the price of the tube and a few common electronics junk bin parts. Read it.

It sounds like you need to make that 200ua meter into the above reading meter Without the device and your old and new meters in hand, I can't help you beyond that.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Robert Dwyer
Posts: 83
Joined: Sun Sep 04, 2016 9:34 pm
Real name: Robert Dwyer
Location: New Mexico

Re: Adding a New Meter to TC Gauge Controlelr

Post by Robert Dwyer » Mon Feb 20, 2017 4:06 pm

Alrighty, thank you very much. I shall set off to do this and give an update on the progress.
If we throw more money at it, it will have to work... right?

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