Power-On Checkout; Output Checkout; Shifted Keys - HP 654 A Series Operating Manual

Table 3-2. Checking the Current Functions (continued)
Press (Protect 1
OC
Indicates the overcurrent protection circuit has tripped, (see
"Supplemental Chziracteristics" in Chapter 1).
Press (■*—)
Press (Output On/Off]
Meter mode
Dis annunciator comes on.
Press fOCP]
You have disabled the overcurrent protection circuit. The OCP
anunciator goes off.
Press
1
Shift f ProtectV
You have cleared the OC protection circuit. The Prot
annunciator goes off.
Press I Output On/Off 1
Dis annunciator goes off and the CC annuniator comes on. AKPS
shows some current.
Press (Current 12 ! 5 1 Enter)
26.000
•"IMPS increases to maximum output.
Press ^Output On/Off)
Dis annimciator comes on ^uld AMPS reading drops to near zero.
Turn off the power supply and remove the short from the output terminals.
* [Shift] key is the unfabled blue key.
*" Maximum current value is for HP 6552A. See "Output Ratings" in "PerfoiiTumce Specifications" of Chapter 1 for
your specific model.
POWER-ON CHECKOUT
1. Connect the power cord to the power source.
2. Turn the front panel power switch to ON (1).
3. Check that the power supply fan is on by placing your hand near the rear grill to feel the
air flow. You may also be able to hear the fan operating.
The power supply undergoes a self-test when you turn it on. If the test is normal, the
following sequence appears on the LCD:
1. A brief star-burst pattern
2. PWR ON INIT for a few seconds (Series 657xA supplies only).
3. The display goes into the meter mode with the Dis annunciator on and all other off.
"Meter mode" means that the VOLTS digits indicate the output voltage and the AMPS
digits indicate the output current. These values will be at or near zero.
Note
If the power supply detects an error during self-test, the display will show an
error message. Go to "In Case of Trouble" at the end of this chapter.
4. Press
[Outout on/ofr)
once. The Dis annunciator will go off and the CV annunciator will go
on.
OUTPUT CHECKOUT
Shifted Keys
Some of the front panel keys perform two functions, one labled in black and the other in blue.
You access the blue function by first pressing the blue
(Shift]
key, which is not labeled. When
the Shift annunciator is on, you will know you have access to the key's shifted (blue) function.
Checkout Procedures
Turn-On Checkout 3-3