Setting The Output Voltage; Setting The Output Current; Save/Recall Checkout - HP 654 A Series Operating Manual

The key is an erase key. If you make a mistake entering a number and have not yet
entered it (have not pressed
fEnter 1),
you can delete the number by pressing You may
delete as many numbers as you wish by repeatedly pressing this key.
Note
The voltage and current values used in these tests are for a typical HP 655xA
Series supply (the HP 6552A). Table 1-la and Table 1-lb in Chapter 1 lists
the ranges for other supplies. If needed, refer to those tables for the voltage
and current ratings of your supply.
Setting the Output Voltage
Perform the steps in Table 3-1 to check the basic voltage functions with no load connected to
the power supply. The VOLTS display will show various readings. Ignore the AMPS display.
Setting the Output Current
You must have a load on the power supply to generate a current output. For this purpose,
you will connect a shorting wire across the output terminals of the supply.
Caution
Some power supplies have a high output current capacity. To prevent
overheating or possible melting of the shorting wire, make sure it is of
sufficient size to carry the supply's maximum output current (see Table 4-2 in
Chapter 4 for the appropriate wire size).
Perform the steps in Table 3-2 to check the basic current functions with a short across the
power supply output. The AMPS display will show various readings. Ignore the VOLTS display.
SAVE/RECALL CHECKOUT
The following steps check the power supply save and recall function keys.
■ Make certain that the
Dis
annunciator if off. Then set the voltage output to 5 volts by
pressing [
Voltage
tsif
Enter
).
■ Save this value to location 1
by
pressing
(shift
1
Recall filf Enter).
■ Remove the output voltage by pressing
(Recall
Yol
Enter
). This recalls the power supply values
stored in location 0, which are the factory reset values (see Chapter 5 for more information).
■ Press (
Recall
iTt
Enter
]
and notice that the output voltage returns to 5.
Line Fuse
If the power supply appears "dead" with a blank display and the fan not running, first check
your power source to be certain line voltage is being supplied to the power supply. If the
power source is normal, the power supply line fuse may be defective. If this is the case,
replace the fuse only once. If it fails again, investigate the reason for the failure. Proceed as
follows: