Introduction
The XPH 75-2D is a dual output 300 watt PSU with multi-mode capability in a compact and
attractive case.
The multi-mode capability enables it to operate as a dual power supply with two independent and
isolated outputs, or as a single power supply of double the power. As a dual, each output
provides 0 to 75V at 0 to 2A (Mode A). As a single the output can be selected as either 0 to 75V
at 0 to 4A (Mode B) or 0 to 150V at 0 to 2A (Mode C). In single modes, the unused half of the unit
becomes completely inoperative and its displays are blanked.
Because of the higher voltages it can produce, the XPH 75-2D uses special safety binding posts
which can accept spade terminals, 4mm plugs, or bare-end wires without exposing any metal
parts.
The XPH series incorporates separate digital voltage and current meters on each output. The
meters use bright 14mm (0.56”) LED displays and have an update rate of 4 per second providing
near instantaneous response. Simultaneous metering of voltage and current provides accurate
information “at a glance” and avoids any possibility of misinterpretation. When an output switch is
set to “off”, the current limit setting is displayed enabling conditions to be set before the load is
connected.
Excellent line and load regulation are matched by low noise and good transient response. High
power efficiency ensures that the unit remains cool without any fan noise.
The XPH 75-2D has been designed to meet the stringent requirements of relevant IEC standards
for safety and EMC, including harmonics emissions. All outputs are intrinsically short circuit proof,
and are protected against external voltages and reverse currents.
Specification
OUTPUTS
Voltage Range:
0V to 75V minimum, Modes A and B.
0V to 150V minimum, Mode C.
Current Range:
0A to 2A minimum, Modes A and C.
0A to 4A minimum, Mode B.
Output Voltage Setting:
By coarse and fine controls.
Output Current Setting:
By single logarithmic control.
Operating Mode:
Constant voltage or constant current with automatic cross-over.
Output Switch:
Electronic. Preset voltage and current displayed when off.
Output Terminals:
4mm safety terminals on 19mm (0.75”) pitch.
Output Impedance:
Typically <5m
Ω
in constant voltage mode.
Typically >50k
Ω
in constant current mode.
Output Protection:
Output will withstand forward voltage of up to 85V (Modes A and B)
or 170V (Mode C).
Reverse protection by diode clamp for reverse currents up to 3A.
Load & Line Regulation:
<0.01% of maximum output for a 90% load change or 10% line
change; <0.1% load regulation for Mode C (150V/2A).
Ripple & Noise
(20MHz bandwidth):
Typically <2mVrms, <15mV pk-pk, constant voltage mode.
Transient Response:
<200µs to within 50mV of set level for 90% load change (Mode A).
Temperature Coefficient:
Typically <100ppm/°C
Status Indication:
Output on lamp. Constant current mode lamp.
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