Operating Instructions-PS
501
0
mode. the display for the entry supply is bright with the
other displays dim. Figure
2-3
graphically illustrates the en-
try mode.
When the VOLTS or AMPS LED is steadily on the pa-
rameter value in the display is the actual value outputed by
the supply. A flashing VOLTS or AMPS LED indicates that
the displayed parameter is not the true value of the output
because the supply is not operating in this regulation mode.
@
OUTPUT
@
CLEAR
Operating Mode
Turns output on or off. LED in pushbutton
indicates output on. Functional in any key-
stroke sequence.
In the operating mode, the displayed parameter auto-
matically switches with regulation mode changes (the dis-
play indicates volts in the constant voltage mode and
amperes in the constant current mode). The display blanks
out (both VOLTS and AMPS
LEDs off) when the supply is
neither in constant voltage or current mode. This occurs
when the logic supply folds back or when any supply is driv-
en into an overvoltage situation from an external source.
Displays instruments primary address while
pressed. Asserts SRQ on GPlB if USER RE-
QUEST is enabled. Functional in any key-
stroke sequence.
Cancels SUPPLY SELECT keystroke.
SUPPLY SELECT
Pressing this button places a supply in the
entry mode. This must be followed with ei-
ther NEG, POS, TRACK, or LOGIC. This but-
ton is nonfunctional if the NOT ENTERED or
ERROR lights are flashing.
@
VOLTAGE
@
CURRENT
@
ENTER
Pressing this button displays the voltage limit
of all three supplies. When this button is re-
leased, the display is returned to the voltage
or current limit each supply is operating
under.
Pressing this button displays the current limit
of all three supplies. When this button is re-
leased, the display returns to the voltage or
current limit each supply is operating under.
Nonfunctional.
@
0
through
9
and
Button
0,
1,
4,
and
7
are functional to select
period
supplies or tracking mode only after SUP-
PLY SELECT is pushed.
Entry Mode
Turns output on or off. LED in pushbutton indi-
cates output on. Functional in any keystroke
sequence.
Displays instruments primary address while
pressed. Asserts SRQ on GPlB if USER RE-
QUEST
is
enabled. Functional in any keystroke
sequence.
The display of the supply in the entry mode returns
to
the previous entry if the ERROR light or NOT
ENTERED light is flashing. This key is the only
method to release the keyboard for other functions
if the ERROR light is flashing. This key places the
front panel into the operating mode if neither light
is flashing.
Changes entry mode from one supply to any other
supply. This is also a two keystroke function, the
supply selected is the other keystroke. This button
is nonfunctional if the NOT ENTERED or ERROR
lights are flashing.
Places only the display of the selected supply into
the voltage entry mode.
Places only the display of the selected supply into
the current entry mode.
A change in the voltage or current (except via the
INCREMENT pushbuttons) must be completed
with this button. Press the desired voltage or cur-
rent pushbuttons and then the ENTER button to
implement the value selected. The display indicates
failure to enter by flashing the NOT ENTERED
light. When entering current in the positive or nega-
tive supplies an automatic
roundoff occurs if the
current is not in
50
mA increments.
Numeric key pad for entering voltages and
currents.
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