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Summary of Contents for LEM LH1050
- Page 1 LH1050 AC/DC Clamp On Power Meter Operating Instructions...
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Page 2: Table Of Contents
CONTENTS PAGE 1 INTRODUCTION ........1.1 Instrument Features ......2 SPECIFICATION ........2.1 Electrical Data ........2.2 General Data ........3 OPERATING INSTRUCTIONS ....3.1 Current Measurement ......3.2 Voltage Measurement ......3.3 Power 1Ø Measurement ....10 3.4 Power 3Ø Measurement ....11 3.5 Frequency Measurement .... -
Page 3: Introduction
1. INTRODUCTION The advanced design of the LH series instruments ensures reliable and accurate measurements under a wide range of operating conditions. Power meter features include: • AC/DC voltage and current measurement • Watts, VA, VAR and PF • Built in 3 phase power capability •... -
Page 4: Specification
The main operating features of the instrument are as follows. See Fig. 1. (1) Clamp-on jaws for current measurement (2) Jaw opening lever (3) Rotary switch for function selection (4) Push button switch for VA, VAR and PF measurements in Watts mode. Press and hold for 2 seconds for REC mode (Min, Max, Av.) (5) Push button switch for HOLD, saves complete data set when in single phase Watts mode. -
Page 5: Electrical Data
2.1 Electrical data (All accuracies stated at 23°C ± 1°C) 2.1.1 Current measurement (RMS and DC) Measuring range ....0 -1000A DC or ACpk Autorange facility ....400A / 1000A Resolution ......100mA in 400A range 1A in 1000A range Accuracy I >... - Page 6 Maximum input 600VRMS / 1000A Pk Maximum overload 1000V RMS / 10,000A 2.1.4 VA measurement (Single and 3 Phase) (RMS and DC) Measuring range ....0-600kVA DC or 425kVA in AC Autorange Facility 40kVA, 400kVA, 600kVA Resolution......10VA in 40kVA 100VA in 400kVA 1kVA in 600kVA ±...
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Page 7: General Data
2.1.7 Frequency measurement (From Current or Voltage sources) Measuring range ....30Hz to 1kHz Resolution......0.1Hz Accuracy 40 - 70Hz.... ± 0.5% rdg 30 - 1000Hz ..± 1% rdg Current Range ....30A to 1000A Pk Voltage Range ....40V to 600V RMS 2.1.8 Digital output A digital interface for connection to a PC is available... -
Page 8: Operating Instructions
Battery life typically 10 hours continuous operation. 2.2.3 Environmental FOR INDOOR USE ONLY Reference conditions. All accuracies stated at 23°C ± 1°C Temperature coeff. of current ±0.1% of rdg per °C Temperature coeff. of voltage ±0.1% of rdg per °C Operating Temperature 0°C to 50°C (32°F to 122°F) Maximum Relative Humidity 80% for temperatures up to 31°C (87°F) decreasing linearly to 50% Relative... -
Page 9: Current Measurement
Watts TRMS W3∅ ∅ ∅ ∅ 3 Phase Watts Frequency On power up the instrument enters a calibration mode in which CAL is displayed. During this period the instrument must not be clamped on any current carrying conductors. 3.1 Current Measurement •... - Page 10 SAFETY WARNING To avoid possible electric shock and damage to the instrument, do not attempt to measure any voltage that might exceed the maximum range of the instrument - 600Vrms and 1kHz • Move the rotary switch to the Volts position. •...
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Page 11: Power 1Ø Measurement
• Move the rotary switch to the W position • Insert the test leads into the sockets on the front of the instrument. Connect the red lead to the V terminal, and the black lead to the COM terminal • Press the trigger to open the jaws, and clamp them on the current carrying conductor, as shown in Fig. -
Page 12: Frequency Measurement
• Move the rotary switch to the W3Ø position • Insert the test leads into the sockets on the front of the instrument. Connect the red lead to the V terminal, and the black lead to the COM terminal • Press the trigger to open the jaws, and clamp them on the phase L1 current carrying conductor as shown Fig. -
Page 13: Logging
• Move the rotary switch to the Hz position • Insert the test leads into the sockets on the front of the instrument. Connect the red lead to the V terminal, and the black lead to the COM terminal • To measure the frequency of the voltage supply apply the test leads to the circuit as shown in Fig. -
Page 14: Safety
Fig. 6 Current Measurement / Logging 4. SAFETY The instrument has been designed to comply with IEC1010-2-032 Installation Category (Overvoltage Category) III 600V Pollution degree 2 and UL 3111-1. The product range conforms with the EEC Low Voltage Directive 73/23/EEC and 93/68/EEC. IEC 1010 is a safety standard which has the following features: •... -
Page 15: Battery Replacement
Where the assessments show that the risk is significant then the use of fused test leads constructed in accordance with the HSE guidance note GS38 ‘Electrical Test Equipment for use by Electricians’ is advised. Maximum Safe Voltage Current :- 600V MAXIMUM AC RMS or DC between uninsulated conductor and ground and maximum frequency of 1kHz. -
Page 16: Warranty
Fig. 7 Battery Replacement 6. WARRANTY Your LEM HEME clamp on power meter is guaranteed for one year from the date of purchase against defective material or workmanship. If the meter fails during the warranty period, we shall at our... - Page 17 The LEM group offers a wide range of non-invasive transducers, probes and instrumentation for the measurement and analysis of current, voltage and power. Since the introduction of the world’s first digital AC/DC clamp-on ammeter in 1982, LEM HEME has continued to provide innovative test and measurement solutions encompassing current measurement from 5mA to 2000A.
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