Atec LMG500 User Manual

Multi Channel Precision Power Meter

LMG500

0,03% Accuracy • 10MHz Bandwidth • 3MSamples/s

Sampling and Evaluation Absolutely Non Gapping

All Inrush Currents and Signal Changes will be Captured

The New Dimension of

Power Measuring

LMG500 e 12.04

LMG500

• For use in all applications

• Measuring inputs for ultimate requirements

• Separated HF current inputs IHF*:
20mA to 3A/DC to 5MHz

• Capacity to earth <20pF

• Measuring with external sensors:
Inputs ISensor and USensor
30mV to 4V/DC to 10MHz

• Current inputs I*, high dynamic
of range: 20mA to 32A/120Apeak

by only one socket pair

No need and incommode change
of external shunts!

• All inputs isolated against each other and against earth (1000V/CAT III)

• Gap free sampling and evaluation with 3MSamples/s at any duration

• Up to 8 power measuring channels in synchronous 3MHz sampling made up with two LMG500

• Voltage inputs U*:
3V to 1000V/3200Vpeak

• Auxiliary voltage ±15V and
Identification of external sensors

General Information

The Precision Power Meter
LMG500, modular for 1 to 8
power channels (phases),
designed with most advanced
technologies will give best
measuring results with all
applications, conventional
devices as motors and trans­formers, as well as with equip­ment designed in sophisticated
power electronics as inverters,
lighting and automotive com­ponents.

The LMG500 performance is
based on and featured by

• its measuring bandwidth
from DC to above 10 MHz.
Pulsed signals with less than
100ns duration will be
captured and measured
most precisely.

• its high sampling rate of
3 MSamples per second,
synchronous and simul-
taneous at all channels
non-gapping, so all steady
state as well as dynamic

events can be measured and
analysed. For the computa­ tion of rms and average
values all data of the
continuous 3 MHz-sampling
will be used, thus preventing
any gaps between those
values. This non-gapping
sampling and computing
technology guarantees
highest precision also at
fast signal changes.

• its high common mode rejec­ tion due to minimisation of
all parasitic infl uences.

• low earth capacities down to
their physical limits (less
than 20pF) yielding a
negligible impact of
measuring device onto the
measuring object.

• very high precision at low
cosphi, e.g. down to 0.001 at
50Hz, is inherent in the
instrument due to bandwidth
and precisely matched delays
of U and I channel. The guar-

anteed accuracy is mainly
determined by the calibration
procedure and used stan-
dards. The usable accuracy
can be amended by more
laborious calibration and
better standards. The trace-
able measuring of trans-
former effi ciency needs an
amended calibration at low
power factor, ZES ZIMMER
Part No. KR-L50-LPF.

ZES ZIMMER’s experience and
skill to design easy to use
ergonomic operation shells give
LMG500 another pole position.
The graphical display gives
real time visualisation of the
measurement with fi gures and
graphs.

The powerful transfer and
evaluation software TERM-L5 for
your PC is another powerful tool
for analysis.

Software PQA enables an easy
and effi cient analysis of power
quality.

Easy operation by use of
colour graphics display and
hotkeys for important
measured values

Various value tables can be
called onto the colour graph­ics display by pressing one key
only, either with 6 values in
large letters, which can also be
read at a glance from a greater
distance, with 12 values or with

up to 40 values e.g. in range
setting or in harmonics table.

The graphics display allows
scope and plot functions for
waveform and timing diagrams,
as well as xy diagrams or bar
charts for the harmonics. The
status bar at the top of each
display menu shows the input
level of the

4 (8) voltage and the
4 (8) current inputs – an
important item of information for
the quality of the measurement.

The display also indicates in
what groups, A and B (C and D),
the input channels are wired
and which signals the groups
are synchronised to.

Channel 1 with 11 measuring values Range setting and scaling

Scope function for waveform of sampling values Plot function of calculated values

Status line, e.g. with 4 power channels

Precise Power Measurement –
this associates with the
famous Precision Power Meter
series LMG of ZES ZIMMER.

The LMG series is that
successful, approved and
keeps state of the art by
continuous research and
development by the ZES
ZIMMER engineering staff.

3
f=var

1
f=50Hz

L

N

V

U

4

A

I

4

A

V

U

1

V

U

2

V

U

3

A

I

1

A

I

2

I

3

Motor

DC

3
f=50Hz

A

I

3

V

U

1

A

I

2

A

I

1

V

U

2

V

U

3

DC

3
f=50Hz

A

I

8

V

U

6

A

I

7

A

I

6

V

U

7

V

U

8

A

I

4

A

I

5

V

U

4

V

U

5

L

2

L

3

L

1

N

2

3

1

n

I4-I

5

Measurements with up to
8 power channels

Example for a measuring with 8 power channels: Uninterruptible power supply with intermediate
direct current link, determination of efficiencies at different states.

8 channel measuring at uninterruptible power supply with intermediate DC link

Efficiency at
asychronous in- and output
(measurement example)

1

Setting of global parameters,
e.g. wiring

2

Conditioning of measuring
signal, setting of sychronisa­tion source for group A

The following block diagram
applies wiring A:1+2+3 B:4 and
is typical for a low power speed

Arrangement of measurement example described with the screenshots below

variable drive. This example is
used to explain the settings
and displays of the LMG500.

1

The screenshots were made with
the free software BMP2PC from
ZES ZIMMER.

2

3

Conditioning of measuring
signal, setting of sychronisa­tion source for group B

4

Measuring ranges, “autorange”
or “manual”, setting of scaling
factors for current and voltage
of group A

4

5

Measuring ranges, “autorange”

3

or “manual”, setting of scaling
factors for current and voltage
of group B

6

Recognizing, displaying and
activation of connected
external current sensor devices

5 6

Wave form (scope menue) of

7

power (yellow), current (red)
and voltage (green) of the
frequency converter single
phase input

8

Wave form of the low pass
filtered 3φ output, the
chopper frequency is no more
contained because of being
outside the filtered range

Large display with

9

6 important values of the
frequency converter input,
measured in group B

10

Phase values and summing
values of the frequency
converter 3φ output gives a
quick overview (group A)

7

9 10

8

11

Efficiency, slip, speed and other
interesting values, calculated
with formula editor programmed
for this purpose

12

The formula editor provides
the individual calculations
shown in picture

13

Vector display of 3φ systems
immediately checks the phase
sequence and shows phase
interchanges

14

Plot display works like a strip
chart recorder and can plot
all measured or formula
calculated values (trend)

11

11

13

12

14

15

Harmonic analysis according
to CE standards

16

Frequency spectrum for
current, voltage (as bar chart),
with CE-limits, linear or
logarithmic

15

16

3
f=var

1
f=50Hz

L

N

V

U

4

A

I

4

A

V

U

1

I

3

Motor

A

I

1

V

U

3

V

U

2

A

I

2

All necessary functions
in the basic device:

- Printer interface

- RS232 interface

- Formula editor

- 3,5” Floppy drive

All necessary functions are included in the basic device at reasonable price: Printer and RS232
interfaces, formula editor and a 3,5” floppy drive.

Options

- Star-Delta Conversion

Part No. L50-O6

Formula editor: the window shows some of the available
mathematical formulae, functions and logical conditions

50Hz -> f=variable, instrument for motor measurement in I∗ U∆ wiring

For detailed test and evalua­tion of 3φ motors the electrical
quantities for each winding
phase are needed.
In some cases you have access
to the motor terminal block
with start and end of all three
windings. Then you can meas­ure all what you need. But in
most cases the motor has only

3 terminals and the internal
star point or the delta winding
as to measure its current is not
accessible.
Also far away from the motor
you have only the three wires.
With the option star-delta con­version you have the capability
to calculate the not accessible
values (e.g. voltages, currents,

Program example for the monitoring of
overvoltage and undervoltage

power, harmonics). This intelli­gent solution with an additional
DSP works well at all wave
forms and every unbalance of
mains and load. Simply connect
the voltage paths in delta and
click the current clamps around
the wires. Select the internal
connection of your load and
press the „Link“ softkey.

Calculation of the real values in the star connected winding
phases (wiring: 3+1, U∆ I∗ -> U∗ I∗)

Options:

The LMG500 can be expanded
with the options mentioned
here.

The IEEE488 interface (Part
No. L50-O1) is able to interpret
the complete SCPI as well as
the LMG500-specific command
set. It has a data rate up to 1
MByte/sec.

The Flicker measurement
(Part No. L50-04) option con­sists of a flicker meter in ac­cordance with EN61000-4-15,
and signals are evaluated in
accordance with EN61000-3-3.

Besides the current/voltage
inputs for power measurement,
further analog and digital meas­uring inputs and signal outputs
are available in the so-called

Process signal interfaces,
digital and analog inputs and
outputs (Part No. L50-O3).

Process magnitudes such as
rotational speed and torque can
be fed to the device to deter­mine the efficiency level, using
the formula editor. Signals can
be derived from the measured
values and can be output again
as control signals.

The Harmonics up to 99th
from U, I and P (Part No. L50-O8)

option can be used to analyse
current, voltage and power,
related to the fundamental
ranging from 0.1Hz to 150kHz.
It is possible to detect Inter-
harmonics by a selectable divi­sion factor giving a new funda­mental as reference. Harmonic
analysis up to 1.5MHz possible
on external PC with ZES ZIMMER
software TERM-L5.

CE-Harmonics (Part No. L50-O9)
up to 40th acc. to EN61000-3-2.

DSP Modules (Part No. L50-O10)
One piece necessary for
operating with options CE-harm
L50-O9, and/or flicker L50-O4

Calculation of the real values in the delta connected
winding phases (wiring: 3+1, U∆ I∗ -> U∆ I∆)

and/or Harm 99 L50-08.
Two pieces necessary for oper­ating the above mentioned op­tions in combination with star
to delta conversion L50-O6.
The respective quantity of DSP
modules has to be doubled
in case a second LMG500 or
the Extension box (Part No.
LMG500-E) is connected.

The Transients (Part No. L50-O5)
option detects peaks and dips
up to a resolution of 330ns,
sampling with 3 MSamples/s.

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4 independent power measuring channels,

Accuracy ± (% of measuring value + % of measuring range)

DC 0.05Hz..45Hz 45Hz..65Hz 65Hz..3kHz 3kHz..15kHz 15kHz..100kHz 100kHz..500kHz 500kHz..1MHz 1MHz .. 3MHz 3MHz .. 10MHz

Voltage U* 0.02+0.06 0.02+0.03 0.01+0.02 0.02+0.03 0.03+0.06 0.1+0.2 0.5+1.0 0.5+1.0 3+3 f/1MHz*1.2 + f/1MHz*1.2

Usenso

r

0.02+0.06 0.015+0.03 0.01+0.02 0.015+0.03 0.03+0.06 0.2+0.4 0.4+0.8 0.4+0.8 f/1MHz*0.7 + f/1MHz*1.5 f/1MHz*0.7 + f/1MHz*1.5

Current I* (20mA .. 5A) 0.02+0.06 0.015+0.03 0.01+0.02 0.015+0.03 0.03+0.06 0.2+0.4 0.5+1.0 0.5+1.0 f/1MHz*1 + f/1MHz*2 -

I* (10A .. 32A) 0.02+0.06 0.015+0.03 0.01+0.02 0.015+0.03 0.03+0.06 0.3+0.6 f/100kHz*0.8 + f/100kHz*1.2 - - ­I HF 0.02+0.06 0.015+0.03 0.01+0.02 0.015+0.03 0.03+0.06 0.2+0.4 0.5+1.0 0.5+1.0 f/1MHz*1 + f/1MHz*2 ­I sensor 0.02+0.06 0.015+0.03 0.01+0.02 0.015+0.03 0.03+0.06 0.2+0.4 0.4+0.8 0.4+0.8 f/1MHz*0.7 + f/1MHz*1.5 f/1MHz*0.7 + f/1MHz*1.5

Power U* / I* (20mA .. 5A) 0.032+0.06 0.028+0.03 0.016+0.02 0.028+0.03 0.048+0.06 0.24+0.3 0.8+1.0 0.8+1.0 f/1MHz*3.2 + f/1MHz*2.5 -

U* / I* (10A .. 32A) 0.032+0.06 0.028+0.03 0.016+0.02 0.028+0.03 0.048+0.06 0.32+0.4 f/100kHz*1 + f/100kHz*1.1 - - -

U* / I HF 0.032+0.06 0.028+0.03 0.016+0.02 0.028+0.03 0.048+0.06 0.24+0.3 0.8+1.0 0.8+1.0 f/1MHz*3.2 + f/1MHz*2.5 -

U* / I sensor 0.032+0.06 0.028+0.03 0.016+0.02 0.028+0.03 0.048+0.06 0.24+0.3 0.72+0.9 0.72+0.9 f/1MHz*3 + f/1MHz*2.3 f/1MHz*1.5 + f/1MHz*1.4

U sensor / I* (20mA .. 5A) 0.032+0.06 0.024+0.03 0.016+0.02 0.024+0.03 0.048+0.06 0.32+0.4 0.72+0.9 0.72+0.9 f/1MHz*1.4 + f/1MHz*1.8 -

U sensor / I* (10A .. 32A) 0.032+0.06 0.024+0.03 0.016+0.02 0.024+0.03 0.048+0.06 0.4+0.5 f/100kHz*1 + f/100kHz*1 - - -

U sensor / I HF 0.032+0.06 0.024+0.03 0.016+0.02 0.024+0.03 0.048+0.06 0.32+0.4 0.72+0.9 0.72+0.9 f/1MHz*1.4 + f/1MHz*2 -

U sensor / Isensor 0.032+0.06 0.024+0.03 0.016+0.02 0.024+0.03 0.048+0.06 0.32+0.4 0.64+0.8 0.64+0.8 f/1MHz*1.12 + f/1MHz*1.5 f/1MHz*1.12 + f/1MHz*1.5

extendable to 8 channels with extension box or second device

The current and voltage paths of the 4(8) power measuring channels are all
isolated to each other and to earth. This allows a high degree of measuring
freedom in many different power measurement applications.

The adjacent table shows
various types of wiring for
grouped and individual meas­urement channels. The table
also assigns application exam­ples for the respective types of
wiring.
Power measurement channels
1(5) and 4(8) can each be
synchronised to their input sig­nals (fundamental waves etc.)
independent of each other.
Channels 1(5) and 4(8) are then
the synchronisation references
for the other channels con­tained in groups A(C)
and B(D).
This is a very useful method for
carrying out efficiency meas­urements for equipment where
input and output have different
frequencies, for example a 3­phase frequency inverter with
single-phase mains supply, or
uninterruptible power supplies
by use of 8 power measurement
channels.

Wiring settings in () are featured
by option „Star-Delta Conversion“

Group A(C) Group B(D)

Technical Data

Voltage measuring ranges U*

Nominal value /V 3 6 12.5 25 60 130 250 400 600 1000
Maximum trms value /V 3.6 7.2 14.4 30 60 130 270 560 1000 1000
Maximum peak value for full scale /V 6.25 12.5 25 50 100 200 400 800 1600 3200
Input impedance >4.5MΩ || <3pF

Current measuring ranges I*

Nominal value /A 20m 40m 80m 150m 300m 600m 1.2 2.5 5 10 20 32
Maximum trms value /A 37m 75m 150m 300m 600m 1.25 2.5 5 10 20 32 32
Maximum peak value for full scale /A 59m 117m 234m 469m 938m 1.875 3.75 7.5 15 30 60 120
Input impedance 560mΩ 68mΩ 8.2mΩ 1mΩ

Current measuring ranges IHF*

Nominal value /A 150m 300m 600m 1.2
Maximum trms value /A 225m 450m 900m 1.8
Maximum peak value for full scale /A 325m 650m 1.3 2.6
Input impedance 0.1Ω

Sensor inputs USensor,ISensor
Nominal value /V 30m 60m 120m 250m 500m 1 2 4
Maximum trms value /V 37m 75m 150m 300m 600m 1.2 2.5 5
Maximum peak value for full scale /V 63m 125m 250m 500m 1 2 4 8
Input impedance 100kΩ || 34pF

Measuring accuracy Accuracies based on:

1. sinusoidal voltage and current 4. definition of power range as the product of

2. ambient temperature 23 °C current and voltage range, 0 ≤ IλI ≤ 1, (λ=Power factor=P/S)

3. warm up time 1h 5. calibration interval 12 month

Other values All other values are derived from the current, voltage and active power values. Accuracies for derived values depend on the
functional relationship (e.g. S = I * U, ∆S/S = ∆I/I + ∆U/U)

Isolation All current and voltage inputs isolated against each other, against remaining electronic and against earth (1000V/CATIII)

Synchronization The measurement is synchronized on the signals period. There is a choice to determine the period from „line“, „extern“,

u(t), i(t) as well as their envelopes, combined with settable filters . By this very stable readings are achieved, even at signals of
pulse width modulated frequency inverters and amplitude modulated electronic ballasts.

Harmonic analysis Measuring of current and voltage with evaluation in full compliance with EN61000-3-2
(option CE Harm L50-O9)

Harmonic analysis Analysis of current, voltage and power up to 99th harmonics, in total 100 harmonics including DC component.
(option Harm100 L50-O8) Fundamental in the range from 0.1Hz to 150kHz. By integer divider (1...128) a new reference fundamental can be created as to

detect interharmonics. Externally on PC up to 1.5Mhz with ZES ZIMMER software TERM-L5

Flicker measuring (option L50-O4) Flicker meter according to EN61000-4-15 with evaluation in full compliance with EN61000-3-3

Transients (option L50-O5) Detecting and recording of transients >330ns

Scope function (standard) Graphical representation of sampled values versus time

Plot function (standard) Time diagram of max. 4 readings, minimal resolution 50ms, respectively 10ms in 50Hz half-wave (flicker) mode

Star delta conversion (option L50-O6) Sums and differences between channels on sample basis

Computer interfaces RS232 (standard) and IEEE488.2 (option L50-O1), only one interface can be used at the same time,

additional USB 2.0 Typ B and Ethernet 10/100 Base-T RJ45 (option L50-O2) available.
Remote control All functions can be remote-controlled, keyboard lock for measuring parameters
Output data Output of all readings, data formats BIN/ASCII, SCPI command set
Transfer rate RS232: max.115200 Baud, IEEE488.2: max. 1MByte/s

Floppy drive (standard) 3.5’’, 1.44MB

Printer interface (standard) Parallel PC-Printer interface with 25-pin SUB-D socket, printing measuring values, tables and graphics

to matrix, inkjet or laser printers

Processing signal interface 2 x 25 pin SUB-D socket with:
(option L50-O3) • 8 analog inputs for process magnitudes (16Bit, ±10V)

• 8 analog outputs (16Bit, ±10V)

• 8 digital inputs

• 8 digital outputs

• 2 input for frequency (0.1Hz...500kHz) and rotation direction

• in- and outputs are isolated against other electronics (test voltage 500V)

Other data

Dimensions • Bench case,
W 433mm x H 147mm x D 400mm

• Accessories: brackets for 19‘‘ rack, 84PU, 3HU, D 400mm
Weight about 12kg
Protection class EN61010 (IEC61010, VDE0411), protection class I, overvoltage category III
Electromagnetic compatibility EN50081, EN50082
Protection system IP20 in accordance to DIN40050
Operating/storage temperature 0...40°C, -20...50°C
Climatic class KYG in accordance to DIN40040
Power supply 85...264V, 47...440Hz, about 100W

LMG500 application software (Name of software is equal with Part No. Please request detailed data sheets)

TERM-L5 Individual configuration of measurement, using all features of the LMG500, spectral analysis, remote of LMG500

PQA Software especially designed for power quality analysis (e.g. EN50160), easy configuring of measurement in a few steps

SYS61K-3-SOFT Control and evaluation software for test systems of harmonics and flicker according to EN61000-3-2/-3

„Plug N‘Measure“ current sensors

Part No. PSU600-L50

Part No. L45-Z06, -Z07, -Z10, -Z11,

-Z16, - Z17, -Z26, -Z28, -Z29, -Z32,
all to be used with LMG500
by means of adapter L50-Z14

(Please ask for special datasheets!)

Adapter for 3-phase measurements
Part No. LMG-MAK3

Longtime Data Logging NDL5

Part No. NDL5

• CEE-Plug, 5 pins, 16A, 2m supply cord

• CEE-Socket, 5 pins, 16A, for EUT

• Socket for supplying the meter LMG500/LMG450

• 4mm safety sockets, measuring access to current and voltage

• Safety acc. IEC61010: 300V/CATIII

• Longtime-data logging to harddisk
for LMG500/LMG450/LMG95,
configuration with ZES ZIMMER software TERM-L5

• Communication via Internet/Ethernet,
even when recording

• Uninterruptible power supply integrated

• W 320mm x H 50mm x D 307mm

Subject to technical changes, especially to improve the product, at any time without prior notification.

ZES ZIMMER Electronic Systems GmbH
Tabaksmühlenweg 30, D-61440 Oberursel/Ts.
Tel. [phone] Fax [phone]

www.zes.com • [e-mail]