VACUUM TUBES: CHARACTERISTICS AND TESTING METHODS

Objective of this experiment:
This training board is a single PCB. To demonstrate how much current flows for one arbitrary value of applied voltage, to plot graph of voltage Ampere characteristics. The starting point for this technique is the static characteristics of the diode. (i.e.,) graph of current versus voltage. This is combined with a graphical construction called a load line, representing the applied voltage and the resistance in series with the diode. The combination provides information about the operation of vacuum diode in the particular circuit represented by the load line.


Built in regulated power supply: +(0-175)V/50mA; AC voltage 6.3V/1 A.
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:


1. To study three electrical quantities.

Plate Voltage VP

Plate current lP
Grid voltage Vg To demonstrate if one quantity varies other will be affected.

2. To study three possible characteristics showing this inter dependence,

Between VP<& l_P for constant value of Vg-static plate characteristics.
To study the dynamic characteristics using various load resistors.
Built in regulated power supply: -15V/300mA, +175 V DC/300mA, AC voltage 6.3V AC
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To draw the characteristics curve between plate voltage VP & plate current lP keeping grid voltage constant.


Built in regulated power supply: + (0-175V)/300mA; 15V/300mA, AC voltage 6.3 V AC/1A. Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To draw the characteristics curve of pentode. Adjust screen grid voltage to positive potential & control grid is kept at Negative potential. Vary the plate voltage & note the corresponding plate current and screen grid current. Plot the plate current against plate voltage.


Built in regulated power supply: + (0-175)V DC/300mA; 15V/300mA; AC voltage: 6.3 VAC/1A Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To measure the grid control characteristic of a thyratron. This experiment will provide an introduction to the operation of this device and will serve to emphasize the fundamental difference between the gas triodes and the vacuum triode,



Built in regulated power supply: + (0-175)V/300mA, -15V/300mA, AC voltage: 6.3V AC/1A