BK Precision 1651A, Instruction Manual

Page: 16 / 88

12
OPERATING INSTRUCTIONS
SAFETY PRECAUTIONS
CAUTION
Avoid contacting the heat sink at the rear of the power
supply. When the unit is providing large amounts of
current at any or all of its outputs, the heat sink can
become very hot. Contacting the heat sink when it is hot
could result in skin burns or damage to the equipment in
contact with them.
Use only a polarized 3-wire ac outlet. This assures that
the power supply chassis, case, and ground terminal are
connected to a good earth ground and reduces danger
from electrical shock.
There may be great danger of electrical shock if the
power supply output is connected to an external high
voltage. Some equipment being powered may contain
high voltage and present a shock hazard. Observe
caution. If the power supply output is floated (referenced
to a voltage rather than earth ground) turn off the power
supply and the equipment under test when making
connections. Never float the power supply to a potential
greater than 100 volts peak with respect to earth ground.
EQUIPMENT PRECAUTIONS
Avoid using the power supply in ambient temperatures
above +40° C. Always allow sufficient air space around
the heat sink at the rear of the power supply for effective
radiation to prevent internal heat build-up.
Although the power supply is protected against reverse
polarity damage, the circuit being powered may not
include such protection. Always carefully observe polarity;
incorrect polarity may damage the equipment under test.
Do not exceed the voltage rating of the circuit being
powered. Many transistors and integrated circuits will not
withstand voltage of 30 volts.
There is no need to worry about voltage spikes or
overshoot damaging the equipment under test. The voltage
between the output terminals of the power supply never
exceeds the preset value as the
POWER
switch is turned
on or off.
INDEPENDENT USE OF “A” OR “B” SUPPLY
The
“A”
and
“B”
supplies each provide a 0-to-24 volt
output at up to 0.5 amps. This procedure covers the use of
the
“A”
and
“B”
supplies only when they are used
independently from one another. When used in the
INDEP
endent operating mode, the operating controls of
the two power supplies are completely independent and
either supply can be used individually or both can be used
simultaneously. Basic operation is covered here. Several
variations are covered in the APPLICATIONS section of
this manual.