ET501 · AC and DC Circuit Fundamentals

Experimental Apparatus for the Study of AC and DC Circuit Fundamentals

Learning objectives / experiments

Direct current circuits

Ohm's law, resistors in series and in parallel
Voltage divider with the potentiometer

Single-phase alternating current circuits

Behaviour of a coil in an AC circuit, with the fluorescent tube in parallel

Charging and discharging a capacitor

Galvanic separation with the 1:1 laboratory transformer

Switching with a DC relay and with an AC relay

Three-phase circuits

Resistors in star and in delta
Phase and line quantities

Starting and loading a DC motor

Electromagnetism with the coil and the iron rod

Measurement with the digital multimeter, voltage, current, resistance and temperature

Continuity and diode testing

Fault finding, from the faults the selector switch introduces

Overview

A portable trainer with its own protected DC, AC and three-phase sources, with the components the circuits are built from and with a fault switch, for the study of direct current, single-phase alternating current and three-phase circuits.

Portable trainer

experiment unit

protected DC source
protected AC source
low-voltage three-phase source
set of resistors for building the test circuits
coil in parallel with a fluorescent tube
2 capacitors
laboratory transformers for galvanic separation, ratio 1:1 and 3:1
switches and push-buttons that connect the circuits and select the test circuit
DC relay and AC relay
indicator lamps, green, yellow and red
potentiometer as a variable resistor
DC motor
resistors wired in star and resistors wired in delta
coil, iron rod and compass for the electromagnetism experiments
buzzer
circuit breaker with test function

Supply 230 V, 50 Hz

Experiment voltages 12 V and 24 V AC, +12 / −12 V DC, 3 × 7 V AC

Inputs and outputs 2 mm safety sockets

Fault simulator 6 faults, each switched in on its own toggle

Net dimensions W 600 × H 500 × D 300 mm

Weight approx. 9 kg, with a carrying handle

Operating environment laboratory, +5…+40 °C

Digital multimeters

measuring instruments

Two identical hand-held multimeters, for measuring and for fault finding on every circuit the trainer builds.

automatic range selection and automatic power off
MIN and MAX, and data hold
continuity test and diode test
temperature measurement with a PT100 or PT1000 sensor
overcurrent protection
backlit display with a bar graph
computer interface, by infrared adaptor to RS-232
protective holster, test leads, spare fuse and 9 V battery with each instrument

Quantity 2

DC voltage and current 30 mV…1000 V, 3 mA…16 A

AC voltage and current 3 V…1000 V, 30 mA…10 A

Resistance 30 Ω…30 MΩ

Display 3¾ digits, 3100 counts, bar chart and backlight

Measuring category CAT II 1000 V

Instrument Rishabh RISH Multi 13S

Scope of delivery

1 ET501 portable trainer

17 safety leads, 2 mm, 600 V CAT II
iron rod and compass

2 digital multimeters, each with holster, leads, spare fuse and battery

1 set of instructional material