Turn-On Checkout
22
Using the Keypad
Shifted Keys
Some of the front panel keys perform two functions, one labeled in black and the other in blue. You access the blue function
by first pressing the blue
key, which is not labeled. When the
Shift
annunciator is on, you will know you have access
to the key's shifted (blue) function.
Backspace Key
The
key is an erase key. If you make a mistake entering a number and have not yet entered it (have not pressed
), you can delete the number by pressing
. You may delete as many numbers as you wish by repeatedly pressing
this key.
Output Checkout
Important
When the power supply is turned on, it asserts the state stored in EEPROM memory location 0. For a new
unit, this is the factory default (*RST) state. The following procedures assume that the factory default
state is still in location 0
(Turn-On Conditions
in Chapter 5 for details).
Checking the Voltage Function
The tests in Table 3-1 check the basic voltage functions with no load connected to the power supply. The
VOLTS
display
will show various readings. Ignore the
AMPS
display.
Table 3-1. Checking the Voltage Functions (Output Terminals Open)
Procedure
Display
Explanation
Output Terminals Open or Connected to a Voltmeter
If
Dis
is on, turn it off by pressing
Press
key
VOLT 0.000
Default voltage setting.
CV
annunciator should be on. (If CC
annunicator is on, increase the current by pressing
one or
more times until
CC
turns off and
CV
turns on.)
Press
VOLT 40
Program output to 40 volts.
Press
40.00
Enter the voltage. Meter mode displays output voltage. During these
tests, there may be a small (relative to full output)
AMPS
reading that
will be ignored.
Press
several times
Voltage decreases several millivolts each time you press the key.*
Press
the same
number of times
Voltage increases several millivolts each time you press the key.*
* The number of millivolts change is determined by the voltage programming resolution
of your power supply (see Appendix A -"Supplemental Characteristics").
Rotate
Voltage
control first
counterclockwise and then
clockwise
Control operates similarly to
and
keys. The control
is rate sensitive. Turning it more quickly causes a more rapid change
in voltage.
Press
40.00
Program output to 40 volts.
Press
Display shows default OVP (overvoltage protection) trip voltage for
your unit (see Appendix A - "Supplemental Characteristics").
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