[RESOLVED] What is causing crackling sound in our TJA 61E Trace?

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Posted by Steven Mullins
Asked on October 27, 2014 10:38 pm
Category: ICP's

Our TJA 61E Trace has the following symptoms:

Suddenly the machine starts making a "crackling sound" (attached video) - I opened the file on my PC with QuickTime.

When the crackling occurs, the flame begins "flickering." The origin of the sound seems to be behind somewhere behind the flame.

What is causing this?

Posted by The Doc
Answered On October 27, 2014 10:42 pm

There are two probable causes for the ”crackling” sound and ”plasma” flickering..

Under the PA tube are located 2 small air capacitors. They are called C1 and C2. Over time they are attacked by acids and other air born chemicals. They need to be replaced every 2 to 4 years.

In the PA box there is a large air capacitor that the contacts wear down. This needs to be rebuilt/replaced every 2 to 4 years.
What is happening is the plasma is acting like a speaker. These parts are shorting out. Small electrical discharges are occurring between the plate and/or contact surfaces. This is then coming out of the plasma as ”Noise” and ”Plasma” flicker.

This condition will effect the performance of the instrument and should be remedied. This is not a normal user replacement part and should only be performed by trained personnel.