TTI EX752M - Operating Modes Overview; Meter Specifications; General Specifications

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Introduction
The EX752M 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.
The EX 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 EX752M 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:
Universal 4mm safety binding posts on 19mm (0·75”) spacing
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 Regulation: <0.01% of maximum output for a 90% load change (Modes A & B).
<0.1% of maximum output for a 90% load change (Mode C).
Line Regulation:
<0.01% of maximum output for a 10% line change.
Ripple & Noise
(20MHz bandwidth):
Typically <2mVrms, <15mV pk-pk, constant voltage mode.
Transient Response:
<200µs to within 50mV of set level for a 5% to 95% load change
(Mode A).
Temperature Coefficient:
Typically <100ppm/°C
Status Indication:
Output on lamp. Constant current mode lamp.