TTI EX752M, Service Manual

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Table of Contents
Specification 1
Safety 3
General 4
Circuit Description 5
Calibration 9
Parts List 11
Component Layouts 19
Circuit Diagrams 21
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 (voltage limit at max).
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.
Temperature Coefficient: Typically <100ppm/°C
Status Indication: Output on lamp. Constant current mode lamp.
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