Wide range RCL meter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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This meter uses the bridge method, but thanks to special measures, a wide range is achieved, which is not found in conventional bridge measurement schemes.
The main parameters:
- Measurement range: resistors, Ohm.......0,1...12-106
- capacitance, pF ....... 1,0 ... 12-109
- inductance, μH ....... 10 ... 12-107
- Supply voltage, V ....... 2x4,5
- Operating voltage frequency, Hz.......1000
- Phone resistance (balance indicator), Ohm.......2000
On transistor V1, an operating frequency generator is assembled, on transistor V2, an unbalance signal amplifier. The bridge is balanced by resistor R10. As exemplary (R1-R8), it is desirable to use resistors with permissible deviations of resistance from nominal values not more than 1 .... 2%. Resistor R16 should have a low resistance between the output of the engine and the top terminal according to the circuit (in the extreme position). You may have to solder a metal plate to the output so that when the engine is set to its extreme position, it is securely connected to the output. Capacitors C1, C3 and C4 are made up of several capacitors, and their exact value is selected when grading the bridge. These capacitors should have minimal losses.
Transformer T1 is made on a magnetic core of Sh8 plates, the thickness of the set is 8 mm. Windings I and II contain, respectively, 2000 and 1500 turns of PEL wire - 0,15, winding III has 600 turns of PEL wire - 0,2.
Transistors are any low-frequency ones with a current transfer coefficient of at least 30. The bridge is calibrated according to exemplary resistors and capacitors. In the inductance intention mode, calibration can be omitted. The bridge is balanced by a minimum of sound in phones.
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