SRT instrument. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The SRT device is an attachment to an oscilloscope that allows you to check diodes, transistors, capacitors and inductors (for short circuit turns) without desoldering from the circuit. With it, you can quickly and easily determine the capacitance of capacitors from 1 to 10000 uF, the health of np junctions (the transistor is checked as two np junctions), check the health of contacts and printed tracks. Indispensable in the repair of equipment.
(click to enlarge)
The operation of the device is based on the principle of passing an alternating voltage with a frequency of 50 Hz through the tested part. To test capacitors with a capacity of 1 to 100 microfarads, a voltage with a frequency of 5000 Hz is used. A relaxation generator is used to test the inductance.
Working with the device:
- Check contacts (button S1). In this mode, when the probes are closed, a signal sounds in the speaker. If the resistance between the probes is greater than 1 Ohm, the signal will disappear.
- Checking diodes and transistors (button S2). When the probes are shorted, a sine wave will appear on the oscilloscope screen. When the probes touch the np-junction (if it is working), there will be one half-cycle of the sinusoid on the screen. From the range of this half-cycle, one can approximately estimate the quality of the np transition.
- Checking capacitors. It is carried out in two subranges: from 1 to 100 microfarads and from 100 to 10000 microfarads. The second range is activated with the S3 button, and the first one is when all buttons are released. The capacitance of capacitors is estimated by the amplitude of the voltage on the oscilloscope screen; the larger the capacitance, the higher the amplitude.
- Checking the inductance (button S4). Short pulses appear on the oscilloscope screen. When checking inductance with short circuit turns, the pulses disappear.
The S5 button is used to turn off the device and connect the oscilloscope input.
Device setup and parts used: resistor R1 adjusts the output signal shape of the 5000 Hz generator. Resistor R2 sets the generator voltage so that in the capacitor test mode in the first and second subranges, when the probes are closed, the signal amplitudes are the same. Resistor R3 adjusts the gain of amplifier D2. Resistor R4 balances the amplifier until the minimum constant component at its output is obtained.
Resistor R5 is configured in the contact test mode for signal operation in the range from 0 to 1 Ohm.
As a supply transformer, you can use any transformer with an output voltage of 12-15 V 0,2 A and two 1V 0,5 A each. Chips D1, D2 can be replaced by any general-purpose operational amplifiers (K140UD6, UD7, UD8, etc.). The TR transformer can be replaced by any output transformer from small receivers. P2K with dependent fixation is used as a switch.
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