Download Standard signal generator GSS-6

Standard signal generator GSS-6
Standard signal generator type GSS-6 is a portable laboratory
instrument designed to produce sinusoidal oscillations of high
frequencies from 100 kHz to 25 MHz.
The unit type GSS-6 is produced by the technical conditions EC-3260000-54 and is designed for
operation at temperatures from +10 to +35 deg. C and relative humidity to 80%. The unit type GSS6 used for adjustment and testing of high levels of radio equipment in the laboratory and workshop
practice.
Main technical characteristics
1. Frequency range from 0,1 to 25 MHz.
2. Calibration error in frequency does not exceed + / -1%.
3. Limits the output voltage at the end of the cable is loaded:
- Resistance of 0.8 ohms from 0.1 to 1000 mV;
- Resistance of 8 ohms from 1.0 to 10000 mV;
- Impedance of 40 ohms from 10 yes 100 000 microvolts.
Voltage ranging from 0 to 1,0 V is removed from a special socket to the output resistance of about
40 ohms.
4. Error in setting the output voltage does not exceed:
- At frequencies up to 2 MHz - + / -3%;
- At a frequency of 10 MHz - + / -5%;
- At frequency above 10 MHz - + -25%
5. Modulation:
a) Internal - amplitude of 400 Hz and a depth of 5% to 100%.
Error of modulation of 4 + / -5% at a depth of modulation up to 50% and + / -10% at a modulation
depth greater than 50%;
b) external - the amplitude, frequency from 50 to 4000 Hz at a carrier frequency from 100 to 400
kHz and a frequency of 50 to 8000 Hz at a carrier frequency from 400 kHz to 25 MHz.
6. The maximum value of THD with modulation depth up to 80% + / -5%.
7. Voltage required for modulation of 80%, 100 W.
8. The instrument used a lamp:
6S5 - 1 pc., 6K7 - 1 pc., 6TS5S - 1 pc., 6F6S (6F6) - 1 pc., 6G7 - 1 pc., 6H6S - 2 pcs.
9. The device is powered from the AC frequency of 50 Hz and 110 V or 220 V at an acceptable
range fluctuations from 100 to 140 and from 160 to 230 V.
10. Overall dimensions 530 x 335 x 325 mm.
11. Unit weight of about 25 kg.
Diagram of the device
Scheme standard signal generator consists of the following main elements: high-frequency
generator, the generator modulating frequency, output voltage meter, measuring the coefficient of
modulation depth and the rectifier. High-frequency generator to eliminate the parasitic frequency
modulation and the attenuator on the frequency response is made by a two-stage scheme with an
electronic link between the steps.
The master oscillator operates on a lamp and 6S5 is a three-point scheme with cathode coupling.
For greater operational stability of the oscillator circuit of the master oscillator between the cathode
and the housing, shunted by the resistance of 27 ohms. Frequency energy from the master oscillator
are fed to an amplifier with a coupling resistance of 1000 ohms, included in the anode circuit of the
lamp 6S5.
Power running scheme consistent supply is made on the lamp 6K7. Lamp 6K7 serves
simultaneously as the modulator. In addition, changing the screen voltage potentiometer "Installing
carrier" of the light level is set to output high voltage.
The device to adjust the amount of output voltage, in addition to the potentiometer "Installing the
carrier", consists of a smooth attenuation, step attenuator and a voltage divider at the end of the
output cable.
The modulator generates a sinusoidal oscillation with a frequency of 400 Hz. It operates on a lamptype 6F6S-connected transistor, and a generator according to the scheme Meissner. To select the
optimum mode, which provides stable operation of the modulator at low THD, the excitation
voltage is regulated by a potentiometer included a portion of the coil windings of the grid.
Measuring the output voltage is collected on one side of the lamp type 6H6S. He is a diode
voltmeter. The second half of the lamp type 6H6S used to compensate for the initial deflection dial
gauge, which is obtained from the initial current first half of the lamp. The variable component of
the rectified voltage is delayed from entry to exit detector, filter, consisting of an inductance of 100
mH and tanks in 2000 and 1500 pF. At the same time the voltage modulating frequencies
throughout the range of 50 to 8000 Hz is fed through a filter to modulometr.
Factor meter modulation consists of low-frequency amplifier and a diode voltmeter scaled directly
to the percentage of modulation.
Grading modulometra, as any other modulometra this type is valid only for a certain output voltage,
in this case, the voltage at the terminals of the attenuator in 1 V.
Rectifier unit assembled on full-wave circuit on the lamp type and powered by 6TS5S transformer
ferroresonance stabilization, which gives approximately a tenfold decrease in the oscillations of the
secondary stress in comparison with the oscillations of voltage, thereby ensuring greater
consistency of the generator parameters.
The design of the instrument
The device is mounted on a metal vertical panel and horizontal chassis, placed in a metal casing,
provided with handles for carrying.
On the front panel are:
1) turnout output meter;
2) turnout measuring the depth of modulation;
3) the output chip "0 - 1;
4) the output chip "0 - 0,1;
5) Handle the zero load;
6) knob and the amplitude of the carrier modulation;
7) two jacks for connecting an external modulator;
8) chip supply, fuse, indicator light and a switch network;
9) switch type of modulation: internal - external;
10) handle the multiplier output voltage;
11) pen range switch;
12) handle the exact frequency setting;
13) handle coarse frequency setting;
14) scale to set reference frequency.