Publication of Electronic Circuits

Oscilloscope Calibrator

Diagram of the Oscilloscope Calibrator

Description of the circuit:
This oscilloscope calibrator produces a square wave of 10 volts and 1020 Hz. or a pulse of 50 microseconds, a scale of 1 to 2 volts. With this tool you can check the calibration and vertical linearity of time-based (horizontal) from an oscilloscope, in addition to the frequency scanning básica.El gauge is a supply of signals with many applications.

OPERATION: This is basically a gauge multivibrator transistorized, which is designed under strict tolerances. The transistors Q1 and Q2 are the ones that form the multivibrator, which is often determined by the values of the components of sync C1, C2, R2 and R3. If we want to reduce the original frequency of 1020 Hz. an accurate signal of 1kHz. (1000 Hz.) simply put on by the C1 and C2, a 20-pF capacitor.

The emitter follower Q3 acts as insulator multivibrator of the effects of load circuit output, also serves as an equalizer impedance.

The output of multivibrator square wave that appears in the collector of Q2 is about 12 volts. Which was reduced to 10 volts that are needed by adjusting the R5. pruducir the push for 50 microseconds, the square wave in Q2 is differentiated by the C3 and R6 and corrected by D2, thereby eliminating the negative excesses. The output is switched to Q3 by the S1 and coupled to external circuit through C4.

SETTING: When you have completed the circuit, is within the scope of the square wave to 10 volts exactly as follows: 1 .- Set the S1 (selector switch) to "square wave" and a connecting bridge between the base of Q2 and earth to overrule the multivibrator.

2 .- Connect a voltmeter of C.C. calibrated accurately through R7 and adjusting the potentiometer (R5) for a reading of 10 volts in voltmeter.

Any time you calibrated the oscilloscope, can be used to measure the pulse in the output calibrated. Unable to adjust the amplitude of the pulse independently, as a function of frequency square wave.

list of components
C1, C2: .001 µF. Ceramic 25-volt
C3 100 pF. Ceramic 25-volt
C4: 10 µF.Electrolyte
Q1, Q2, Q3: 2N697
D1: Zener 12 volt 5 watt
D2: 1N457
R1: 27KΩ
R2: 698KΩ potentiometer.
R3: 698KΩ
R4: 27KΩ
R5: 250KΩ potentiometer
R6: 100KΩ potentiometer.
R7: 3.9KΩ
SW1: 2 pole switch 3 positions
SW2: 1 pole switch 1 position
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