Imported power analyzer company

High precision, single channel power analyzerLMG671

The LMG series has450 series, 611 series, 641 series, 671 seriesThe new 671 series can achieve7 channels, 3 levels of precisionMatch with each other to achieve customer satisfactionBetter cost-effectiveness and upgradable performance.

Our new S-channel provides customized measurement ranges for both AC and DC. When set to communication mode, the difference between the nominal value and the peak value will take into account the actual peak factor. When set to DC mode, the nominal value will be closer to the value, indicating that the range can be selected more intuitively, thereby providing better accuracy. In the above example, the 400 V upper limit corresponds to the 250 V range gear when set to AC, and the 360 V range gear when set to DC.

Powerful, Convenient, Flexible | Modular

Module A:

DC, 0.05Hz-10MHz ， Sampling rate of 1.2MSa/s

Basic accuracy of voltage and current: ± (0.01% of reading+0.02% of peak range)

Basic power accuracy: ± (0.015% of reading+0.01% of peak range)

Module B:

DC, 0.05Hz-500kHz ， 采样率151kSa/s

Basic accuracy of voltage and current: ± (0.03% of reading+0.03% of peak range)

Basic power accuracy: ± (0.05% of reading+0.02% of peak range)

C module:

DC, 0.05Hz-10kHz ， 采样率151kSa/s

Basic accuracy of voltage and current: ± (0.02% of reading+0.02% of peak range)

Basic power accuracy: ± (0.03% of reading+0.01% of peak range)

New S module launched - optimized measurement of DC (1500 VDC)

S module application:

High voltage direct current transmission lines: improving long-distance transmission efficiency
Photovoltaic array: DC string is used from households to large-scale power plants, achieving a system operating voltage of 1500 VDCbigMinimize system balance (BoS) costs
DC charging station facilities: fast charging stations for electric vehicles operating at high DC power levels
Electric vehicles: passenger cars, buses, heavy-duty trucks, and agricultural vehicles driven by electric transmission systems
DC energy storage system: a DC energy storage system that uses solar energy on a DC microgrid

S module:

AC&DC accuracy&stability of *
• Dedicated AC/DC range
• Automatic zeroing
•tallUp to 1000 VAC, measurement level CAT III
•tallTo 1500 VDC, measurement level CAT II

LMG671 Details

10.1 inches, 1280100 resolution, quickly read all important menus

DVI/VGA input can be used for external displays or projectors

Real time display of all device functions, remote operation, and data visualization

• Brand new GUI interface, smooth operation without thinking

Perform harmonic and interharmonic measurements according to the old C/EN 61000-4-7 standard, with the instrument displaying up to 1000 times and calling up to 2000 times through instructions

• (Optional) Can input speed and torque sensors of all signal types (analog, frequency signals, such as RS422, TTL, or HTL)

Flexible script editing tools for special applications

• Convenient calculation of all derivative variables of power analyzer

Simultaneous measurement of voltage, current, power, and harmonics

• List or graphical display

The frequency, type, and characteristics of the signal filter can be freely set

Automatic recognition and power supply after connecting the current sensor

• Easy connection, no risk of setting errors

Synchronization of signals at different frequencies

Measure flicker according to the old C/EN61000415

• Directly obtain high-resolution sampling values and harmonic values through the interface

Convert line voltage into phase voltage in a three-phase three wire system and measure the active power of each phase

user interface

Built in high-capacity storage media, standard 16GB solid-state drive, can be added with 250GB solid-state drive

Even with settingsquickThe cycle can also be used for long-term internal data storage.

• Provides outstanding communication capabilities through Gigabit Ethernet, RS232, and optional DVI/VGA, CAN2.0A/B

C module

Simultaneous measurement of power under two bandwidths, dual path technology - no compromise, beyond doubt

In traditional power analyzers, the measured signal is first subjected to analog processing, and then converted into a digital signal through an A/D converter for processing. The resulting signal can be measured across the entire frequency range, or can be used as the basis for FFT analysis or further digital filtering through an anti aliasing filter. Due to the limitations of A/D converters, some of their inherent drawbacks will be introduced into traditional devices. If the filter is turned on for measurement, to avoid confusion in FFT analysis, wideband values are discarded. If the filter is turned off, strictly speaking, FFT should not be used. If an anti aliasing filter is not used for FFT analysis of the entire frequency range, the calculated values are suspicious and the aliasing error can reach up to 50%. For example, it is easy to find that at least 0.5% of the deviation will be ignored no matter what. Finally, the validity of the results is also questionable when alternating between filtered and unfiltered measurements, as this assumes the condition that the signal does not change over time, which is almost non-existent in reality. In addition, this processing procedure is particularly time-consuming.

All the star measurement methods ultimately proposed were merely unsatisfactory compromise solutions. That's why ZES ZIMMER fundamentally redesigned signal processing and developed a dual path architecture. The analog processing is the same as traditional measuring instruments, but the subsequent digital processing has changed. Each voltage and current channel of LMG600 has two A/D converters in two independent signal paths of the power analyzer. One is used for unfiltered measurement of wideband signals, and the other is used for narrowband signal measurement of anti aliasing filter outputs. Parallel digital processing of sampled values allows users to simultaneously obtain two measurement values of the same signal without worrying about the risk of confusion. This approach avoids the drawbacks of all the methods mentioned earlier and ensures accurate results in a short amount of time.

Gapless measurement

In the process of strictly monitoring the energy consumption and efficiency of electrical equipment, new standards and regulations are continuously introduced in order to fairly compare products from different manufacturers (such as SPECpower_stsj2008, IEC62301, EN50564). For applications such as office computers, servers, or household appliances that follow the same principle: the process of energy consumption always requires long-term analysis, considering all relevant operating conditions. There may be an order of magnitude difference between minimum load (such as standby) and full load.

This makes precise measurement very challenging (see 'Measurement of Standby Power Consumption and Energy Efficiency' application report). Some measurements require execution for more than a few hours and are seamless. By selecting a sufficiently wide measurement range, data loss caused by changing the range can be avoided.

Accurate measurement with 3ns delay

Nowadays, frequency converters use fast switching semiconductors to improve efficiency, which creates steep voltage edges, resulting in capacitor currents that severely test the insulation of bearings and motors, which may lead to premature failure.

Motor filters (such as dU/dt filters) can attenuate steep voltage gradients, despite the power loss caused by the instantaneous oscillation of the filter's own frequency (usually greater than 100kHz).

The wide bandwidth range of LMG600 and the small delay between voltage and current allow for extremely accurate measurement of the power loss of the filter at this frequency, including longitudinal measurements at low power factors. It also applies totallA high-frequency measurement of 10MHz requires a very small delay to be designed between the voltage and current channels. The delay between the voltage and current channels of LMG600 is less than 3ns, which is equivalent to a phase angle error of less than 1 µ radian at 50Hz. This makes the instrument suitable for measuring power loss at low power factors in transformers, reactors, capacitors, ultrasonic generators, etc. No additional options or adjustments are required, and the standard configuration of LMG600 is already capable of handling this measurement task. Voltage and current sensors are commonly used to measure high-power circuits, and the measurement accuracy can be improved by correcting the phase angle of these sensors.

Satisfy precise measurements of different ranges

Although LMG600 provides a wide range of voltage and current, there are always some applications that require special measurement ranges. Whether you need to measure currents of several hundred amperes or voltages of several thousand volts, we have ready-made solutions. We offer a wide range of voltage and current sensors that can work with the LMG600 high-precision power analyzer to expand the instrument's measurement range to the desired range. Our plug and play sensors are equipped with a bus system, which allows the LMG600 to automatically recognize and set up. This allows all important parameters, such as precise ratio factor, delay compensation, last calibration time, sensor model, etc., to be automatically read by the power analyzer and used during the measurement process. In addition, the sensor is powered by LMG600 and no longer requires a separate external power source.

By using plug and play sensors, users can obtain good results without the need for fine-tuning. From the user's perspective, there is no difference between direct measurement and using sensors for measurement. Of course, sensors from other brands can also be used on LMG671.

Powerful interface

In addition to GUI (graphical user interface) and connecting to the device under test itself, data exchange with existing computers and software is important in determining how well the instrument can perform its intended tasks. Only instruments seamlessly integrated into the entire system can be fully utilized by users. The high-speed sampling rate of LMG600 inevitably generates a large amount of data. By using the correct system architecture, we ensure that measurement data can be transmitted through high-speed interfaces. Even high-resolution measurement data of all important parameters such as voltage, current, active power, etc. can be quickly transmitted to the connected computer within a few minutes. To meet the various needs of different applications, a series of ports are available for use. In addition to a serial port and gigabit Ethernet, there is also a USB slot for data storage; The instrument can also be equipped with a VGA/DVI output for external connection

Monitor or projector. In addition, two slots can be retrofitted for future interface standards&currently support CAN interfaces that comply with ISO11989-2 (high-speed CAN) standards, supporting CAN standards 2.0A and 2.0B,tallThe speed is 1Mbit/s. By using an integrated synchronization interface, multiple LMG600s can be accurately synchronized with each other. This enables measurements involving multiple LMG600s in the same system, or control or connection of LMG600s through oscilloscopes or waveform generators, to have the same time reference. Due to its internal hard drive, the LMG600 even stores measurement values, settings, user-defined measurement parameters, or graphics for future use without connecting to a computer. In terms of storage capacity, users have several options available. The firmware of LMG600 can be quickly and easily upgraded via USB.

Process signal interface

It is often necessary to conduct further measurements beyond electrical parameters in order to make a meaningful overall statement about the performance and efficiency of the tested equipment. Therefore, in order to determine the reliable simultaneity between electrical and mechanical events, it is very important to synchronize these measurement values and calculate their true effective values through LMG600. A typical application is the analysis of electric drive systems, where torque and speed signals are measured and called together with electrical parameters. On the contrary, it is also possible that the power analyzer outputs measurement results in analog form for further processing, or triggers switch operations that depend on the measured variable or derived quantity. To meet all these potential demands, LMG600 offers a variety of different input/output interfaces for analog and digital signals.

Star Triangle Conversion

In a three-phase three wire system, only line voltages V12, V23, V31 and line currents I1, I2, I3 are directly measured. By using the star delta conversion option, the neutral voltage of the three-phase three wire star connection is converted into a phase voltage that is not directly measured, and the corresponding single-phase active power can be obtained. Similarly, the line current of the three-phase three wire delta connection can be converted into phase current. Through these converted values, all other variables, such as harmonics, can be guided. Distortion and imbalance in the power grid or user end can also be obtained. This makes the use of an external, artificial neutral point more cumbersome; Although anyone can use a neutral point at any time, if all relevant adverse conditions are taken into account (such as increased power loss, etc.).

Easy to use - touch screen, buttons, and peripheral devices can be operated freely

To ensure that LMG600 can be used in any situation, universal availability is particularly important. All display modes and settings can be selected through touch screen or button operation, without exception. The optimized design always connects the buttons to the relevant views and settings options on the screen. Almost no familiarity is required to effectively use the instrument. The graphical user interface guides users directly to the desired numerical value. The true effective value of voltage or current, related harmonics, or energy accumulation can usually be obtained by pressing a button. In addition, user-defined views allow measurement values to be grouped separately, so all parameters are always clear at a glance. This ergonomic operation method saves time and directly contributes to the effective use of LMG600. On the right side of the display screen, there are eight sets of context related two function keys, whose functions always correspond to the same line on the right side of the screen, which is very important for ease of use. Anyone can easily determine the function assigned to the function key at a glance. The design of the dual function key allows for quick configuration of corresponding parameters, eliminating the need for unrelated view switching. When there are questions about functionality and control when operating the instrument, relevant chapters of the operation manual can be displayed at any time.

One click display of important parameters

Flexible grouping settings ensure simple and clear channel relationships

In order to clarify the functional relationship between physical measurement channels correctly, power measurement channels (P channels) can be grouped into so-called groups, which are generally presented as virtual measurement channels or virtual devices outside the physical channels. The logical combination of P channels depends on the number of connections and phases of the analyzed system. Due to the flexibility of LMG600, it can even be configured into unusual and rare configurations, such as phase separated systems and four phase or multi-phase systems, which are both simple and reliable. The requirement is that all channels in the same group have the same fundamental frequency and are the same module (A, B, C). This will avoid minor errors caused by different technical performance of different module types. One benefit of creating a group is that it simplifies the setup of instruments, such as allowing filters that affect all channels within the same group to be set only once. In addition, derived values such as active, apparent, and reactive power of all channels within the group are calculated. When the channels are connected in the grouping logic, the wiring will specify how the input of the measuring equipment is connected to the measuring circuit, regardless of whether it is a star delta circuit or a circuit with a neutral wire. The wiring indicates how the instrument interprets the measurement signal.

Dynamic range