B&K Precision 1730A - Manual - Manual (Page 11)

10
OPERATING INSTRUCTIONS
SAFETY PRECAUTIONS
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 is little danger of electrical shock from the power supply output,
which produces a maximum of 30 volts dc. However, 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 out put 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.
HOOK-UP
1. Turn off the power supply and the equipment to be powered
during hook- up.
2. Connect the positive polarity of the device being powered to the
red (+) terminal of the power supply.
3. Connect the negative polarity of the device being powered to the
black (-) terminal of the power supply.
4. Fig. 3 illustrates the grounding possibilities.
a. If the negative polarity of the equipment or circuit being
powered is also the chassis or common, it may be grounded to
earth by strapping the black (-) terminal to the green ( )
terminal as shown in Fig. 3A.
b. Similarly, the positive polarity can be grounded by strapping
the red (+) terminal to the green ( ) terminal as shown in Fig.
3B.
c. If an earth ground reference is not required, the configuration
of Fig. 3C may be used. The scheme in Fig. 3C should also be
used where it is not known whether the chassis is common with
either the positive or negative polarity.
d. If the chassis or common of the equipment being powered is
separate from both the positive and negative polarity power
inputs, use the connection shown in Fig. 3D.