Tracker 200 readings distortion

Tracker 200 readings distortion
« on: April 30, 2016, 08:07:24 am »
Hello, I have a Huntron Tracker 200 and I've been using it for a long time.

I had solved previous issues related with the relays, Transistor and resistors but now the problem can't be resolved that easily. It seems like there is a problem with the calibration mainly in the Low2 frequency. The line on the oscilloscope is not vertical when you touch the two tips of the Microprobes. It seems to have a slight angle distortion. I believe that the problem may be from the T101 Signal XFMR with reference 06-6080, but I'm not sure. Because of that distortion it's hard to get accurate readings.

So I would like to know if you have any idea of what may be the problem and if it is possible to the the schematics.




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Re: Tracker 200 readings distortion
« Reply #1 on: May 02, 2016, 06:51:06 am »
Can you post a picture of  the bad signature?

The Tracker 200 (aka TR210) schematics are linked in this thread:
http://www.huntron.com/forum/index.php?topic=216.0
The most important troubleshooting tool is your eyes.

Re: Tracker 200 readings distortion
« Reply #2 on: May 02, 2016, 02:52:51 pm »
Thank you very much for the scheme.

I'm sending you a video where you can see the problem. In the video I'm touching the two tips of the Microprobes.

https://www.dropbox.com/s/s5yxa4z3x2r9qsl/hutronT200problem.mp4?dl=0

I've already replaced the R143 and R167 of 73.2 ohm (73R2) and the relay K101, but the issue still happens.

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Re: Tracker 200 readings distortion
« Reply #3 on: May 03, 2016, 07:06:24 am »
The LOW2 range will be the most sensitive to small resistive changes in the circuit. If you didn't use 1% resistors then you could see a slight change in angle. After looking at the video I think the amount of angle change is insignificant enough when it comes to general use. However, there is a test procedure that I have posted. You can download it here:
http://www.huntron.com/privatesales/technical/200-test-procedure.pdf
The most important troubleshooting tool is your eyes.

Re: Tracker 200 readings distortion
« Reply #4 on: May 05, 2016, 11:44:15 am »
Thank you for the test procedure.

I've replaced the resistors with 1% tolerance and even some of them we used with 0.1%. We noticed the problem started when the transformer T101 (Signal XFMR 06-6080) was rebuilt.

Is it possible to buy a new one? If it's not possible, could we get the transformer scheme in order to build a new one.

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Re: Tracker 200 readings distortion
« Reply #5 on: May 09, 2016, 07:11:41 am »
The signal transformer is no longer made and we have zero in stock. Unfortunately the drawings are not available. If the LOW2 range is only showing a slight angle change from vertical then it should still be usable.
Thanks.
The most important troubleshooting tool is your eyes.