Two-beam oscilloscope C1-55
Laboratory work 1
STUDY AND WORK WITH ELECTRONIC MEASURING INSTRUMENTS
The purpose of work: introduction with the principles of construction, operation and technical characteristics of pulse generators H5-54 and TWO-BEAM oscilloscopes S1-55. Achievements of work skills with these devices in a time domain.
Brief theoretical information
In determining of the efficiency of electronic components, devices and systems, as well as for debugging and research (analysis), test signals are sent on the input and the reaction is analyzed. Test signals are often used as:
- Harmonic signal (sine);
- Rectangular pulses;
- Pulses of the form;
- A set of pulses for a particular equipment.
Test harmonic signals are used in the analysis of systems in the frequency domain where it is important to study the bandwidth of the device. For example, the audio frequency amplifier.
During studying of pulse and digital devices it is an important to investigate their velocity of action. Test signals are used as rectangular pulses.
At the output of test devices there is connected electronic voltmeters or oscilloscopes, or specialized visualization and control signals systems, including data processing systems of varying complexity, including computers.
Studying the discrete and microelectronic components of radio electronic equipment during the laboratory practical study transients processes in semiconductor diodes, transistors and integrated circuits. For this purpose, test signals are used as rectangular pulses generated by generator H5-54. Oscilloscope C1-55 is used as a device that records the response on the output of device.
Pulse generator H5-54
Pulse generator H5-54 is used in the investigation, adjustment and tuning of electronic devices.
Depending on the type of devices that are investigated, there is a need in the text signals with given parameters. Therefore, the generator provides forming of rectangular pulses with variables: repetition period (T), duration 
, amplitude A, delay 
. The front panel of the generator H5-54 is shown in fig.1.1.
Fig. 1.1. shows:
1 - start button group, where
- Hold button - launch an external negative pulse;
- Hold button - launch external impulses or sine wave;
- When pressing 
the working-time (one-time) start);
- Hold the top button, device operates on a domestic run (this mode of operation of the generator used in laboratories).
Fig.1.1
Device generates video pulses of positive and negative polarities rectangular form from 0,1 to 1000 ms.
Pulse width (τ) is regulated by smooth-step (8 subrange) from 0,1 to 1000 ms (1 MLC) and installed in the chapel 0,1 - 0,3, 0,3 - 1,0; 1 - 3 3 - 10 10 - 30, 30 - 100;
100 - 300, 300 - 1000 microseconds.
The maximum amplitude Amax of main pulses on the external load 500 ohms with an equivalent capacity of 50 pF is not less than 75 V.
It is provided smooth adjustment of the amplitude Amax, which is equal to 75 V, and the decreasing (weakening) of coefficients (K) 1, 0,3; 0,1; 0,03.
The instrument has two additional outputs: 1:10 and 1:100 with coefficients of 0.03.
Time shift (delay D) of primary pulse for sync pulse is regulated smoothly-step from 0,1 to 1000 ms and is set within: 0,1 - 0,3, 0,3 - 1,0; 1,0 - 3,0; 3 - 10;
10 - 30, 30 - 100, 100 - 300 300 - 1000 microseconds.
Value D must not exceed 0,5 of basic pulse repetition period (T).
Pulse repetition frequency (F) at internal launching smoothly govern-step (8 subrange) from 0,01 to 100 kHz and setting within: 0,1 - 0,3, 0,3 - 1,0; 1.0 - 3 , 0 3 - 10 10 - 30, 30 - 100. The device provides the specifications within the rules after samoprohrivu for 15 min.
In front of the generator (Fig. 1.1) there are controls of connections and control.
Two-beam oscilloscope C1-55
Analyzing the reaction of system on influence of test signal compare input and output signals. With this purpose Two-beam oscilloscope C1-55 is used in the laboratory works.
Two-beam oscilloscope C1-55 is designed for simultaneous observation and study of two forms of electrical processes by measuring their time and amplitude values. Oscilloscope front panel is shown in Fig. 1.2.
Fig. 2.1 shows:
1- two-beam cathode ray tube with regulators modes of each beam.
2 -switch scanning duration.
3 - calibrator.
4 - input and regulator of sensitivity channel Y1.
5 - input and regulator of sensitivity channel Y2.
6 - input and block switch of synchronization.