EL Series Service Manual (Including EL302Tv)

EL Series (including EL302Tv) Power Supplies

Service Manual

Manual Part Number 48511-0380 Issue 2

Applicability This Service Manual covers models EL301, EL302, EL183, EL561, EL302D, EL302T and EL302Tv from their introduction to the present. Models EL303 and EL155 are covered by a separate manual 48511-0920.

Table of Contents Specification

2

Safety

4

EMC

5

Installation

6

General

7

Circuit Descriptions

9

Calibration

11

Parts List

13

Component Layouts & Circuit Diagrams

35

1

Specification MAIN OUTPUTS Voltage Range:

0V to 18V minimum (EL183) 0V to 30V minimum (EL301, EL302, EL302D, EL302T, EL302Tv) 0 to 56V minimum (EL561)

Current Range:

0A to 1A minimum (EL301) 0A to 1.1A minimum (EL561) 0A to 2A minimum (EL302, EL302D, EL302T, EL302Tv) 0A to 3.3A minimum (EL183)

Voltage Setting:

By coarse and fine controls.

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”) pitch.

Output Impedance:

Typically 50kΩ in constant current mode.

Output Protection:

Outputs will withstand forward voltages of up to 20V above the rated output voltage. Reverse protection by diode clamp for currents up to 3A.

Load Regulation: