Megger LT300 Specifications

LT300

High current loop testers



High current loop tester



Single and 3 phase testing



16 Hz to 400 Hz operation



CATIV 300 V applications



Two wire lead set or mains plug leads



Tough armoured case

LT300

High current loop testers

DESCRIPTION

The LT300 offers high current loop testing over a wide range
of frequencies and supply voltages with simple, fast, two wire
operation.

It has a large clear display that aids visibility in poor conditions.

Two models are available:

LT300-EN-00 - with red/green leads

LT300-EN-BS - with BS1363 mains plug lead

LT300-EN-FS - with fused red/green leads

The high current loop test provides fast accurate and stable results
with a resolution to 0.01 Ω on the 20 Ω range.

Frequency range

Supply frequency is indicated upon connection to the supply. This
will automatically set to the measured supply frequency either 16
Hz, 50/60 Hz or 400 Hz. Testing will commence automatically.

Loop Impedance measurement:

Two loop impedance ranges are provided.

20 Ω - Resolution to 0.01 Ω

200 Ω - Resolution to 0.1 Ω

Supply voltage:

Operational supply range extends from 50 V to 550 V (400 V @ 16
Hz), with a warning for voltages over 330 V highlighting accidental
phase to phase connections on a nominal 230 V system.

Single Phase CATIV 300 V phase to earth, as well as 550 V phase to
phase applications (400 V @ 16 Hz)

GENERAL 1

The instrument is housed in a rubber armoured case with a built-in
cover to protect the display when not in use.

The IP54 weatherproof rating provides excellent protection in
adverse conditions.

The instrument is supplied with either a two wire (red/green) lead
set, or a mains plug test lead for access to wall sockets, a certificate
of test and a hard carry case.

SPECIFICATION

Voltage measurement range

Voltage range: 0 V to 550 V (400 V @ 16 Hz)

Accuracy: ±5% ±2 V

Loop test operating frequencies

16 Hz 15 Hz to 18 Hz, 33 Hz, 29 Hz to 337 Hz

50/60 Hz 40 Hz to 70 Hz, 125 Hz, 100 Hz to 142 Hz

400 Hz 260 Hz to 498 Hz

Test currents

20 ½ Range 200 ½ Range

550 V 27 A 2.7 A

230 V 12 A 1.2 A

115 V 6 A 0.6 A

50 V 3 A 0.3 A

Loop test accuracy

Loop resistance:

0 to 19.99 ½ (20 ½ range) ±5% ±0.03 ½

0 to 199.9 ½ (200 ½ range) ±5% ±0.5 ½

Environmental

Operating temperature: -10°C to +60°C

Storage temperature: -25°C to +70°C

Humidity: 90%RH @+40°C

Maximum altitude : 2,000 m

Dust and water: IP54

Battery: 8 x AA (LR6) alkaline or NiMH

rechargeable cells.

Safety

Meets the requirements of IEC61010-1 300 V CATIV phase to earth

or 550 V Phase to Phase (400 V @ 16 Hz).

EN61557

Complies with the following parts of EN61557,Electrical safety in
low voltage systems up to 1000 V a.c. and 1500 V d.c. Equipment
for testing, measuring or monitoring of protective measures:

Part1 - General Requirements

Part3 - Loop resistance

EMC

In accordance with IEC61326-1

Weight: 980gms (2.16lb)

Dimensions: 203 x 148 x 78mm ( 8 x 5.8 x 3 in)

LT300

High current loop testers