Datasheet

* Safety interlocks
A key requirement in a power supply is to prevent the wrong voltage
or current being accidentally applied to the circuit-under-test.
Consequently all operations that could result in an unexpected
change in voltage or current settings have intelligent interlocks to
prevent this.
** Safety terminals
The use of fixed-shroud 4mm plugs is becoming mandatory within an
increasing number of laboratories for safety reasons.
Standard binding post terminals can not accept these fixed-shroud
plugs.
Dual Output model - PL303QMD (quad-mode dual)
90% of
actual size
Compact Dimensions
The PL303QMD is a dual output power supply with the same high
power density as the single output models - 180 watts from a half
rack 3U sized casing (214mm x 131mm).
Four Modes of Operation
The PL303QMD is more than just two PL303 single power supplies
in one box. It has four modes of operation: Independent, Isolated
Tracking, Isolated Ratio Tracking, and True Parallel.
Independent Mode: The two outputs are
completely independent and electrically iso-
lated from each other.
Isolated Tracking Mode: The two outputs
remain electrically isolated, but the voltage
control of the Master output sets an identical
voltage on the Slave output.
Note: Isolated Tracking enables the user to create two rails
of either polarity and to reference them to different grounds
if necessary (e.g. digital ground and analog ground).
Isolated Ratio Tracking Mode: As normal
tracking, but the Slave voltage can be set to
any percentage of the Master voltage and re-
tains that ratio as the Master voltage is varied.
True Parallel Mode: All of the power is chan-
nelled to the Master output which can then
supply up to 6 amps.
Note: In Parallel mode the Master side becomes a single
180 watt power supply, with the current meter operating
to 6 amps. The slave output is disabled and its displays are
turned off.
Simultaneous Output Control
The Both On/Both Off buttons are in addition
to the individual switches for each output,
and allow both outputs to be turned on or off
synchronously by a single button press.
Synchronous switching of the outputs is of
increasing importance for circuitry which can be
damaged if one voltage rail is present without
the other.