B&K Precision 1762 - Manual - Manual (Page 33)

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APPLICATIONS
GENERAL
The Model 1760A/1761/1762 power supply has a very wide
variety of applications in electrical and electronics servicing,
engineering laboratories, manufacturing and testing facilities,
schools, and home hobbying. The “A” and “B” power supply
outputs are fully adjustable from 0-30V (1760A), 0-35V (1761), or
0-60V (1762) and 0-2A (1760A and 1762) or 0-3A (1761) and the
4-6.5V (1760A) or 2-6.5V (1761 & 1762) supply is fully adjustable
with a current capability of 0-5A. This flexibility makes it suitable
for most applications requiring a DC power source.
ELECTRONICS SERVICING
Most electronics troubleshooting and repair is performed on a test
bench. This power supply can provide the DC power source to
operate a module or circuit board on the test bench when it is
removed from its parent equipment. It can be used to power
portable, battery-operated equipment and check the effect of low
battery voltage. It can power vehicular equipment such as tape
players, auto sound systems, CB radios, etc. on the test bench.
Parallel tracking supplies up to 4 amps, adequate surge current for
most vehicular equipment.
Most automobiles and other vehicles use 12-volt electrical
systems. Although the electrical system is normally referred to as a
12-volt system, actual battery voltage when fully charged is
approximately 14 volts. The power supply may be set to 14 volts for
servicing equipment from vehicles with 12-volt electrical systems.
Some trucks use a 24-volt electrical system; bench testing of
equipment from these systems should be performed at 28 volts.
Some servicing applications require the injection of a
variable DC voltage for certain tests, such as checking the
effect of AGC bias in a television receiver. This requires an
isolated DC power supply, such as the Model 1760A. The
equipment being tested may contain its own power supply
and operate from AC power. A DC voltage may already be
present in the circuit. One polarity of the power supply
output is floated to an appropriate point in the circuit, such as
the emitter of a transistor. The other polarity of the power
supply output is then applied to another point in the circuit,
such as the base of that transistor. Varying the power supply
voltage then varies the DC bias on the stage, and the effects
may be noted. A series limiting resistor is often used to
protect the circuits from overdissipation.
ELECTRONICS MANUFACTURING
In electronics manufacturing facilities, the power supply is
often used as a DC power source while testing and adjusting
modules, subassemblies, and complete units in the
production and assembly area or in the quality control area.
The instrument can be used in incoming inspection as a DC
power source for testing purchased components and
subassemblies.
This power supply is particularly well suited for
manufacturing applications because of its ease of operation
and its continuous duty rating. When load current or total
power dissipation are among the main characteristics to be
measured, the total load current and voltage are easily
displayed on the LED display. The current limit can be set so
that all units which do not meet the load current specification
will cause the CC indicator to light, and the unit can be