Programming Voltage; Out Of Range; Programming Current; Cv Mode Vs. Cc Mode - HP 654 A Series Operating Manual

Programming Voltage
To program the output for 4.5 volts, proceed as follows:
■ Press
(Voltage).
The display will change from meter mode to indicate
VOLTS.
■ Press (TXTKTt
Enter
}■ If you discover a mistake before pressing
[Enter
], erase the incorrect value
with the backspace key Q.
■ The display will return to the meter mode and indicate 4.5000 volts.
Note
The power supply must be programmed for a minimal current in order to
increase the output voltage beyond zero. Normally, there is sufficient current
to do this. If the power supply does not respond or the Unr annunciator
comes on, go to "Programming Current" and set the current to a small value.
Now raise the voltage by pressing (Tvoitage) (or rotating the Voltage control clockwise). Note
that the voltage increases by a specific increment (depending on the voltage resolution) each
press the key and increases rapidly as you hold down the key. lb lower the voltage,
press (1
Voltage)
or rotate the Voltage control counterclockwise.
Try to program a voltage greater than the
Vmax
for your supply. Note that the display shows
OUT OF RANGE.
Programming Current
Note
You may program the power supply current without a load, but must have
a load in order to draw output current. If you do not have a load on the
power supply, you may connect a short across the output terminals for this
procedure. Turn the power supply off before making any connections.
■ To program the output current to 1.3 amperes, proceed as follows:
■ Make certain that the voltage is not programmed to zero
■
[Current
]. The display will change from meter mode to indicate AMPS.
■ Press OCKDlsSD-
discover a mistake before pressing
(Enter
], erase the incorrect value
with the backspace key [^).
m The display will return to the meter mode and indicate up to 1.3000 amperes, depending
upon the load.
Now raise the current by pressing [fcurrent) (or rotating the Current control clockwise). Note
that the current increases by a specific increment (depending on the current resolution) each
time you press the key and increases rapidly as you hold down the key. To lower the current,
press (jcurrent) or rotate the Current control counterclockwise.
Try to program a current greater than the
Imax
for your supply. Note that the display shows
OUT OF RANGE.
CV Mode vs. CC Mode
Once you program a voltage (Vs) and a current (1$), the power supply will try to maintain
itself in either CV or CC mode, depending on the resistance of the load (Rl). If the load
demands less current than Is, operation will be in CV mode with the voltage maintained at
Vs- The output current will be at some value below Is as determined by Vs^-Rl-
Voltage and Current
Front Panel Operation 5-5