Turning the load on/off
You can turn the
load on/off on
each
channel. Apply an external signal across pins 1
and 4 of the CH
CONT connector. For turning the load
on,
the change
in
the exter-
nal
voltage (edge) is
detected. For turning the load
off, the external signal level is
detected.
Use the pohuity of the
load-on external control in the configuration settings (section
5.9)
to select low
active
or
high active.
•
See Table
5-5
for the
input signal conditions.
When
the load is turned
on externally,
the
load
can be turned off from the panel.
However,
when the
load is turned off externally,
the load cannot be turned on from
the panel, GPIB, or
RS-232C.
[Ndfi
•
If you set
the polarity
of the load-on
external control to
low active and open the
signal input
terminal,
you will only be able to
turn on the load
using the CH
CONT
signal.
The
external signal
input is TTL level.
Open-circuit voltage is
approxi-
mately
-t-5
V. Be sure to
return the current to
CH CONT pin 1
.
Current monitor
output
You
can monitor the
input current of
the PLZ-U. The
monitor signal is
output across
pins 2 and I (pin 1
is common) of
the CH CONT
connector. Full scale of
the current
range
corresponds to
10 V output.
Pin 1
of the CH
CONT connector
is connected to the
negative load
input
terminal. Do
not
allow pin 1 to touch
other pins.
PLZ-U
Application
Operation
5-27