THD
Is a measure of a signal's sum power of all harmonic components to the power of the fundamental frequency.
See Also: Total Harmonic Distortion
- Soft Hearts LLC
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Audio Test Software
1. Distortion free stimulus even the equalized stimulus.2. Unlimited channels acquisition and processing. (Hardware limited)3. Human correlated listening test(Bark Scale intensity chart). (Requires large memory)4. Hi Res intensity chart for buzz/pop detection. (Requires large memory)5. Auto equalization method with target dBSPL accuracy.6. TCP client for test framework integration.7. Easy limits and logs development.8. Easy logs visualization module.9. Auto waveform alignment and triggering.(Upt...show more -
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THD Improvement Kit
IG-18 Series
Many voices, one kit. Lots of articles have suggested improvents to the Heathkit IG-18. But until now, no one offered a complete kit to make these modifications easy for the DIY'er. We have incorporated the best of those published ideas and now offer a complete kit to help you upgrade your Heathkit IG-18.
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40kw High Efficiency AC/DC Power Supply Charger 100-750VDC Charging Rectifier 100A Battery Charger
SD750100G
Zhejiang Sandi Electric Co., Ltd
40kw High Efficiency AC/DC Power Supply Charger 100-750VDC Charging Rectifier 100A Battery Charger is for DC battery system charging station. With three-phase non neutral conductor AC input, it has the advantages of high efficiency, high power density and low harmonic. 50-500Vdc output voltage range optional, suitable for all types of batteries.FeaturesProduct Introduction：SAND AC/DC Charger is specially developed for DC chargers module. It has high efficiency, high power factor, high power dens...show more -
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AC / DC Digital Power Analyzer
4016（800Vp,20Arms/200Ap）
To analyze AC/DC power source, it requires a lot of parameters. Such as voltage(V), current(A), power factor(PF), Total Harmonic Distortion(THD), Crest Factor(CF), Inrush current, etc. To meet power saving regulation, the standby power measurement must be done. In this video I will show you how to operate this Prodigit Power Analyzer 4016. Furthermore, I explain what the parameter's meaning.
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AC+DC Power Sources/Amplifiers
The N4A range of AC+DC Power Sources are available with a variety of output power ratings from 6kVA up to and above 30kVA. They are the perfect solution for general power source applications as well as IEC61000 electromagnetic compatibility standards testing, offering low THD and excellent reliability.
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Adjustable High Frequency Reference Ballast
HCS-109A
HCS-109A Adjustable High Frequency Reference Ballast also called High Frequency Current Source. Comparing to IEC Test Method, HCS-109A is an Equivalent Test Method which is economic solution. HCS-109A equipped with Spectrophotometer & Integrating Sphere Test System. It can also measure the photo, color and electricity parameters for high frequency fluorescent lamp.Specifications: • Input voltage: 200V~240V, 50/60Hz • Input Power: 80 W max • Output Current: 130mA~400mA (Adjustable), accuracy: +/- 1% • Output Frequency: 25kHz< +/-2.0% (Adjustable), accuracy: +/- 0.3kHz • Output current total harmonic wave distortion: THD<2.5% (HF current wave)
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Audio Analyzer
DScope M1
All essential measurements like THD+N, noise, crosstalk, sweeps, impulse response plus simple code free test automation and additional modules for advanced features.
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CCFL Ballast Tester
WT2000A-CCFL
This tester is specially designed for analyzing the electrical characteristics of CCFL Electronic Ballast, meets the test requirements in international standard• Input characteristics analysis: measure Vrms, Irms, W, PF, Hz, phase angle Measure THD, 0 to 39th harmonic components, Accuracy: ±(0.4% reading+0.1% range+1 digit)• Output characteristics analysis: measure lamp voltage, lamp current, lamp power, oscillatory frequency, crest factor of lamp current, Accuracy: Class 2• Interface RS-232C provided for easier communication with PC for printing test report
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Clamp-On Meters
Rugged and professional, our complete line of clamp-on meters offer full functions including: AAC, ADC, VAC, Ohms, Continuity, Frequency, Diode Test, TRMS, %THD, %DF, CF and Peak. Varying in size, our clamp-on meters provide a solution to all power quality measurement needs.
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Clean Power Source
AC1000A
The AC1000 achieves its unique price/performance ratio by actively adjusting the incoming mains waveform to produce a clean output. Other suppliers use convertor techniques to completely recreate the output from scratch. Our solution delivers an output which achieves the required THD with the minimum of hardware and expense. It includes the ability to switch the correction in or out so that the original waveform can be observed and measured if required. Overload and thermal protection systems are built-in and produce an audible warning if activated.
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Digital Power Meter (High Accuracy Model)
LS2050
LS2050 digital power meter is a new generation intelligent product which adopts digital sampling technology to analysis of the waveform. It has the following features: • Three windows digital display which reduces reading error, intuitive and convenient • Adopts high speed MCU and high precision A/D to control and measurement • All measured data as virtual value, also suit to signal waveform distortion • Fast test • Equipped with RS232 communicate function, can use upper...show more -
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Digital SINE Controller
DVC-4/8 SINE
RANGE: 2 to 6250 Hz, digitally synthesized.STABILITY: +/- 100ppm/C, crystal-controlled.DISTORTION: <0.50% thd 0.25% typical.LIMITS: Sweeps between programmed upper and lower limits.
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Energy and Harmonics Analyzer
STAR3
STAR 3 is a high quality 96x96mm panel energy analyser provides brilliant features at a price never reached before. The new bright red LCD display, the harmonic analysis, the wide set of measured parameters including the THD available in all the models, the multi-protocol capability of the RS485 port and the high accuracy class 0.5%, the 3 years-warranty period, allow to consider the STAR 3 the new state of art of the panel analysers market
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Input Characteristic Analyzer of Electronic Ballast
UI2001
• 4 display windows for V (600V), A (2A), W, PF/Hz • THD, 0 to 39th harmonic components • Accuracy: ± (0.4% reading + 0.1% range + 1 digit) • Data and curves printable. All the data and curves can be displayed after being connected with PC
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LCD Power Meters
Accuracy ±0.1% F.S. Measuring and display ACV/ACA/Watt/Var/VA/Power Factor/Frequency/KWH/DM(Demand) Input measurement network can be selectives(1P2W/1P3W/3P3W/3P4W) CT rate/PT rate can be modified(1 to 9999) Measuring ACV/ACA total harmonic distortion(THD),up to 35th harmonic(optional) Two alarm control function (optional) Two pulse output function (optional) Digit RS-485 interface function (Optional)
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LED Driver & Bulb Testing Instruments
Providing you the best range of Driver Testing Machine, Digital Power Analyzer, THD Power Analyzer, AC Production Tester, Smart QC Meter and Power Supply Tester with effective & timely delivery.
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Meter Software Module
Metra Mess- und Frequenztechnik in Radebeul e.K.
*Level display as five digits number*Display selectable between acceleration, velocity and displacement*RMS, positive, negative and unsigned peak values, instantaneous value *Rotary speed measurement with Photoelectric Reflex Switch (only VM-METER+)*Main frequency (only VM-METER+)*Measurement at rotation speed or multiples (only VM-METER+)*Sound level meter (A and C weighted) and noise dose meter (only VM-METER+)*THD (distortion) measurement (only VM-METER+)*One VM-METER license can be operated simultaneously up to four times with different settings*Offline measurement
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Multifunctional Meter
CPM-80
Chuan Sheng Electronics Co., Ltd.
CPM-80 multifunction power analyzer provide high accuracy single phase and three-phase energy measuring and displaying, energy accumulating, power quality analysis, data logging and data communication. CPM-80 series meters are able to measure bidirectional, four quadrants kWh and kVarh. It provides maximum/minimum records for power usage and power demand parameters. Hardware standard built in a RS485 Modbus communication port , 4 Digital inputs, 2 Relay outputs, LCM and 2MB flash for data-logging. In addition , also provide TOU , voltage and current THD, harmonics up to the 63rd and auto wiring change via software .
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Multifunction Meter for Electrical Installations
AMPI-530
Measurement of short-circuit loop ; Testing of differential, general and selective protections for differential current ; Measurement of insulation resistance ; Up to 10GΩ ; Voltages: 50 V, 100 V, 250 V, 500 V, 1000 V ; Measurement of earth resistance ; Bi-directional continuity test on PE cables, phase sequence ; Measurement and recording of voltage, frequency, alternating current, cosϕ, power, harmonics and THD
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Network Analyzers
MPR6 Series
Dimensions:96X96kVArh, Max, Min: available (available) % THD I: available (available) % THD V: available (available)Harmonics 1-51.:RS-485:available (available)Digital Input:Digital Output:2AO:0/14-20mA: AO:0/2-10V:Relay:2 Pulse Output: available (available) Hour (RTC): available (available) Memory:1MB Pulse Counter: none (none) Operating Hour: none (none) Alarm: available (available) CT-25: none (none) 110/230 VAC:none (none) 85-265 VAC/DC: available (available) 45-265 VAC/DC: none (none) 10-56 VDC: none (none) Pcs. / Carton:8
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Network Analyzers
MPR2 Series
Dimensions:DIN4 kVArh, Max, Min: available (available)% THD I: none (none) % THD V: none (none)Harmonics 1-51.: RS-485: none (none)Digital Input:Digital Output:Temperature Input:AOV:RLY: Memory:Current Voltage Unbalances: none (none) X5/X1: none (none)Plug & Meter: available (available) 85-300 VAC/DC: available (available)
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Phantom Powered Measurement Microphone System
7052PH
The 7052PH Type 1.5TM phantom powered measurement microphone system offers a cost effective solution to acoustic measurements from phantom powered sources. Type 1.5TM - a superior Type 2. Frequency Response: <3 Hz to > 20kHz typ.(capsule). Sensitivity: 22 mV/Pa (-33 dBV/Pa)typ. Dynamic Range (capsule) 1% THD: <20dBA-150dBSPL (Capsule).
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Portable Three-Phase Current Load
EE-120A-3
The Current Source is able to generate three-phase currents, synchronized with the service voltage, with unprecedented stability and measurement accuracy. The amplitude and phase-shift of each current is individually adjustable. The values of voltage, current, power, power factor, phase shift, THD and frequency are indicated on the LCD display.
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Portable Three-Phase Phantom Load
EE-120A-3 + EE-500V-3
The Phantom Load is able to generate three-phase voltages and currents with unprecedented stability and measurement accuracy. The amplitude and phase-shift of each current and voltage is individually adjustable. The generated values of voltage, current, power, power factor, phase shift, THD and frequency are indicated on the LCD display.
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Power Factor RLC Load
3282（280V,1875W / 3700VA ）
3282 power Factor RLC Load built-in 16-bit A/D and DSP precision measurement circuit, provides accurate measurements, measurement items have Vrms, Arms, Watt, VA, CF, PF, THD, VTHD, ITHD, Ipeak, Amax, Amin, Vmax, and Vmin. In addition to these measurement functions, it also provides time measurement，products such as UPS, fuses and circuit breakers etc. trip or blow time and transfer time for Off-line UPS
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Power Phase Converter Single phase 220VAC to 3 phase 380VAC Converter
SDT-40KW
Zhejiang Sandi Electric Co., Ltd
SANDI SDT series single-phase to three-phase converter, adopted SVPWM modulation control technology, which can convert ordinary single-phase power to industrial three-phase power. After through SDT series single-phase to three phase converter power conversion, the three-phase power output is standard pure sine wave, the harmonic distortion rate (THD) is less than 2%, totally meet the national standards of three-phase power quality, applicable to all types of load.
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Power Quality Analyzer
PQA-300
PQA-300 Power Quality Analyzer offers the latest functionality and measurement technology designed specifically for the Utility industry. The PQA-300 is a compact solution to address; Flicker PST and PLT, Voltage and Current imbalance, Sags, Dips and Swells, harmonics, inter harmonics, THD, RMS Voltage and Current, Phase and Time measurement.
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Production Line Acoustic Test Chamber
PLATC
The Production Line Acoustic Test Chamber from GRAS is designed for quick and qualified acoustic test of cell phones, tablet PCs, Bluetooth speaker systems etc., including frequency response, THD, Rub & Buzz and microphone test using optional sound source. The chamber has a number of connections for injecting test and control signals to the test object (DUT).Benefits include:Repeatable testing and reliable dataEasy open/close for quick and safe change of DUTFlexible test jig for easy adjustm...show more -
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PXIe-4463, 51.2 kS/s, 2-Output PXI Sound and Vibration Module
783086-02
51.2 kS/s, 2-Output PXI Sound and Vibration Module - The PXIe‑4463 offers high dynamic range and THD+N for audio, acoustic, and vibration applications. It provides the high precision and dynamic range necessary for the most stringent audio generation requirements in a modular form factor. The PXIe‑4463 contains two 24-bit digital‑to‑analog converters to allow for fully differential simultaneous generation. Complete with three gain ranges, the PXIe‑4463 can generate current with programmable, per channel output configurations. The two timing engines allow you to perform multisample-rate applications on a single module and independently start and stop channels on a single module.
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PXIe-4463, 51.2 kS/s, 2-Output PXI Sound and Vibration Module
783086-01
The PXIe‑4463 offers high dynamic range and THD+N for audio, acoustic, and vibration applications. It provides the high precision and dynamic range necessary for the most stringent audio generation requirements in a modular form … factor. The PXIe‑4463 contains two 24-bit digital‑to‑analog converters to allow for fully differential simultaneous generation. Complete with three gain ranges, the PXIe‑4463 can generate current with programmable, per channel output configurations. The two timing engines allow you to perform multisample-rate applications on a single module and independently start and stop channels on a single module.
