16
Connection to the Load
The load should be connected to the positive (red) and negative (black) OUTPUT terminals. Both
are fully floating and either can be connected to ground.
Warning!
Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must
be taken when using the power supply at voltages above this level.
Always make connections to the instrument with the OUTPUT off.
Remote Sensing
The instrument has a very low output impedance, but this is inevitably increased by the resistance
of the connecting leads and the contact resistance between terminals and leads. At high currents
this can result in significant differences between the indicated source voltage and the actual load
voltage (even two 2m
Ω
connecting leads will drop 0·2V at 50 Amps, for instance). This problem
can be minimised by using short, thick, connecting leads, but where necessary it can be
completely overcome by using the remote sense capability.
This requires the sense terminals to be connected to the output at the load instead of at the
source; insert wires into the REMOTE SENSE terminals and connect directly to the load.
Warning!
Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must
be taken when using the power supply at voltages above this level.
Ensure that the exposed end of the wire is fully inserted and inaccessible to the touch.
Always make connections to the instrument with the OUTPUT off.
Select remote sense by pressing SHIFT, SENSE; the message
Turn On Remote sense?
OK to confirm, ESCAPE to cancel
is shown in the display and the OK lamp flashes.
Press OK to confirm or press ESCAPE to exit without changing state.
R/SNS
(Remote Sense)
shows in the display beside the output status (
OFF, CV, CI
or
UNREG
) when remote sense is
selected. Remote sense is turned off by pressing SHIFT, SENSE again; the message
Turn Off
Remote Sense? OK to confirm, ESCAPE to cancel
is shown in the display and
the OK lamp flashes. Press OK to confirm or press ESCAPE to exit without changing state; the
R/SNS
indication in the display goes off when remote sense is deselected.
To avoid instability and transient response problems, care must be taken to ensure good coupling
between each output and sense lead; this can best be done by twisting the leads together. An
electrolytic capacitor directly across the load connection point may also be beneficial.
The voltage drop in each output lead must not exceed 1 Volt.
Sense Miswiring Trip
The output will be tripped off if the voltage between an output terminal and its corresponding sense
terminal exceeds approximately 2V; this will happen if the sense wires are wired at the load to the
wrong output or if an attempt is made to draw power from the sense wires.
If the sense terminals are miswired in this way the output is turned off and the message
Sense
Error – Check Connections
is displayed. Pressing ESCAPE at this point removes the
message and the display now shows the preset voltage and current limit. When the cause of the
trip has been corrected the output can be turned on again.
Series or Parallel Connection with Other Outputs
The outputs of the power supply are fully floating and may be used in series with other power
supply units to generate high DC voltages up to 300VDC.
The maximum permissible voltage between any terminal and earth ground (
) is 300VDC
Warning!
Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must
be taken when using the power supply at voltages above this level.
Always make connections to the instrument with the OUTPUT off.
