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Old 5th Dec 2020, 1:57 pm   #18
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Join Date: May 2009
Location: Linkoping, Sweden
Posts: 1,178
Default Re: VCM 163 problem while calibrating

The second "R14" that you see is actually the component value for Thermistor 2 - "Th.2". Thermistor 1 "Th.1" has a component value of "A14". These thermistors can be found in the STC / ITT Thermistor guide I've included.

RV1 at 500 Ohm on the output from the oscillator is known to go open circuit.

The mA/V range switch which is used in the calibration position is also known to break, sometimes the center contacts damage the outer contacts and break.
Attached Files
File Type: pdf STC_THERMISTORS_BW-Adobe-OCR.pdf (2.22 MB, 11 views)
Martin, Sweden
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