Forbidden ceramic soldering iron experiment: testing the heater and thermocouple with a military-...
The soldering iron from the Zhongdi ZD-929C soldering station, created by the dark genius of the ancient Chinese, has stopped responding adequately to its owner's wishes. We disassemble the soldering iron, remove the so-called ceramic heating element, and conduct forbidden experiments on it to determine its functionality.
An old Soviet digital voltmeter, the RV7-22A, a DT-830 analog, assembled from loose parts—optional amplifiers, transistor assemblies, and small logic—helps us examine the disassembled soldering iron.
The heating element contains a thermocouple, which the soldering station uses to measure the current temperature of the soldering iron.
The RV7-22A universal voltmeter is a military series model, similar to the civilian B7-22A. It has 2000 readings and a DC accuracy of ±(0.15+0.4(Uk/Ux))%. ±(0.15+0.2(Uk/Ux))% (1000 V), operating frequency range when measuring alternating voltage: 45 Hz - 100 kHz, when measuring alternating current: 45 Hz - 10 kHz.