D.C SOURCES


The device shown below is a D.C Power Source with variable voltage and current control. The device has a maximum output of 30 volts at 6 amps. A basic description of each of the components on the face of the device can be found by "clicking" on that particular part of the diagram below.

1) Power Switch:

This is as expected merely the switch used to turn the device on and off.


2) Ammeter:

This gauge has a full scale deflection of 6 Amps. It displays the output current of the device passing from the positive to negative terminal.


3) Voltmeter:

This component of the supply displays the voltage across the positive and negative terminals of the supply. It has a full scale deflection of 30 Volts.


4) Device Terminals:

The terminals of the power source are used to connect the source to a circuit as required. The use of these is very simple as long as the correct polarity conventions are obeyed. These conventions are as follows:

Red:

The positive terminal, having a potential equal to the reading on the voltmeter.

Black:

The negative terminal, always having a potential of zero volts.

Green:

The Ground terminal, which is connected to the chassis internally.

5) Voltage Controls:

These two knobs as is obvious control the voltage output between the positive and negative terminals of the supply. The knob on the left is called the Coarse control and is used to adjust the output voltage between 0 and 30 Volts. The knob on the right is the Fine control which is used to adjust the ouput voltage to within a fine tolerance.


6) Current Controls:

These two knobs as is obvious control the current output passing between the positive and negative terminals of the supply. The knob on the right is called the Coarse control and is used to adjust the output current between 0 and 6 Amps. The knob on the left is the Fine control which is used to adjust the ouput voltage to within a fine tolerance.


7) CV Indicator:

This lamp is activated when the power is on and the output voltage of the device is constant. It is important to note that if this lamp is not lit any measurements taken from the circuit being powered by the supply may not be accurate as this situation implies circuit instability.


8) CC Indicator:

This lamp is lit when the output current exceeds the constant current. This lamp implies the opposite to the CV indicator as when it is lit it implies circuit instability.


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Revised: 15 September 2004