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In this video, I show the settings of the built-in voltmeter during cursor measurements, that is, when measuring the movements of the oscillogram with the position knobs left-right and up-down.
The first episode shows the operation of the built-in voltmeter when measuring the voltage at the input jacks, and also shows a trimmer resistor that can be used to adjust the voltmeter.
In the second episode, I show the existing problem of inaccurate readings when making cursor measurements on the "Y1" and "Y2" channels, as well as the location of the sensitivity controls for both vertical channels and the horizontal channel.
In the third episode, I show the procedure for calibrating and adjusting when making horizontal cursor measurements.
In the fourth episode, the problem of eliminating the drift of indications during cursor measurements is solved.
The cause of the problem is a low-stability ceramic capacitor, the solution to the problem is its replacement with a film polyethylene terephthalate (PET) K73-17 with a capacity of 2.2 microfarads. Unlike ceramic, PET capacitors have a lower temperature coefficient of capacitance and less leakage.
Equipment and materials used in the video:
DC power supply B5-43 (behind the scenes);
Analogue oscilloscope S1-140A (SK1-140A) - patient;
Voltmeter universal RV7-22A;
Ceramic screwdriver with a narrow sting.