8
Output Terminals
The output and sense terminals are duplicated on the rear panel terminal blocks and are marked
+O/P, −O/P, +S and −S. These connections are paralleled with their front panel equivalents.
Switch the LOCAL/REMOTE switch to REMOTE when remote sensing is required. When the rear
panel Output terminals are used, the use of remote sense is always recommended to ensure that
output regulation is maintained within specification; connections can be made to either the front or
the rear remote sense terminals but never to both pairs of terminals at the same time. Switch back
to LOCAL when remote sensing is not in use.
Analogue Remote Control (CPX400SA only)
Connections CV and CC provide analogue control of the Output Voltage and Current Limit
respectively when slide switches CV and CC are set to Remote. These inputs, and their common
return signal (RTN), are isolated from the output; the isolation rating with respect to the output is
300V max. The input scaling can be set independently, by intermal links, as 0 to 5 Volts (the factory
default) or 0 to 10 Volts for 0 to 100% of maximum output. Maximum permissible input is 60V. CV
and CC can be used independently or together.
Return slide switches CV and CC to Local when analogue remote control is not in use.
Analogue Out (CPX400SA only)
Connections V
OUT
and I
OUT
provide analogue outputs scaled to the set output voltage and set
current limit respectively. The scaling is fixed at 0 to 5 Volts for 0 to 100% of maximum output.
V
OUT
and I
OUT
are always present on the terminals, whether the instrument is under local or remote
control.
Warning! COM is referenced to the output control circuit and will be within ~1V of the
positive output potential. V
OUT
and I
OUT
are always present on the terminals.
Do not apply external voltages to these terminals.
Remote On/Off (CPX400SA only)
A switch closure or logic low between connections Rem Off and COMmon will turn off the output.
Warning! COM is referenced to the output control circuit and will be within ~1V of the
positive output potential.
Do not apply external voltages to these terminals.
RS232 (CPX400SP only)
9−pin female D−connector with pin connections as shown below. Can be connected to a standard
PC port using a fully wired 1:1 male-female cable without any cross-over connections.
Pin Name Description
1 RI
Passively asserted (+V through 10kΩ)
2 TXD Transmitted data from instrument
4 CTS
5 GND Signal ground
6 RTS
Passively asserted (+V through 10kΩ)
7 DSR No internal connection
8 DTR
9 CD No internal connection
Signal ground is connected to instrument ground.
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