Power Instruments

4
Multi-function Electrical Installation Meter | MPI-540
Price range: R64,493.00 through R106,648.00 ex vat
Multi-function Electrical Installation Meter - Overview

The MPI-540 meter has models for home and industrial electrical installations, photovoltaic installations and vehicle charging stations. Measurements taken by these devices determine the safety of the installation. The user also has the option to register the parameters of the electrical network's location.

Verification of the quality of electricity and measurement of the parameters that protect against electric shock is easy with this single, universal device. This superior meter combines the measurement capabilities of several devices while ensuring quality and accuracy. Significant automation of measurements with the meter makes it possible to test functioning of residual current circuit breaker in the auto mode, as well as in pre-programmed measuring sequences (so-called auto-tests), which can also be extended with your own sequences. Automatic measurement of insulation resistance of 3-, 4- and 5- wire conductors is possible by using additional the AUTO ISO-1000C adaptor.

This device is ideal for all measurements for the commissioning of electrical installations in accordance with applicable regulations.

Multi-function Electrical Installation Meter - Features
- 7 " TFT LCD touch screen with a resolution of 800 x 480 pixels
- Removable memory card - easy increase of memory capacity
- One device can be used for all measurements for commissioning of electrical installations in accordance with applicable regulations:
  - short circuit loop impedance (also in circuits with RCDs)
  - parameters of RCDs
  - insulation resistance
  - earthing resistance (4 measurement methods + ground resistivity measurement)
  - continuity of protective and equipotential bondings
  - lighting measurement
  - phase sequence tester
  - motor rotation direction tester
- three-phase power network data logger can record 50/60 Hz power network parameters in acc. to S class of EN 61000-4-30:
  - voltage L1, L2, L3, - average values in the range up to 500 V,
  - L1, L2, L3 currents, - average values, current measurement in the range up to 3 kA (depending on the current clamps used)
  - frequency in the range of 40Hz - 70Hz
  - active (P), reactive (Q) and apparent (S) power
  - power factor (PF), cosφ
  - harmonics (up to 40 in voltage and current)
  - total harmonic distortion (THD) for current and voltage
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Mid Energy Meter | UEM63-4D R70
R5,789.00 ex vat
Mid Energy Meter - Overview

This three-phase energy meter for energy measurement in industrial and civilian applications has 4 DIN modules. It comes with built-in RS485 Modbus RTU/ASCII communication. Available with MID certification which is suitable for billing. The meter can measure the main electrical parameters and makes them available on the built-in COM port, making management by a remote station possible. Data is transmitted on a RS485 line. A free dedicated application for remote management is provided. The backlit LCD display shows the readings clearly and easily. The specific selection of its components reduces the internal working temperatures, guaranteeing a product of excellent quality.

Mid Energy Meter - Features
- RS485 Modbus RTU/ASCII communication
- Up to 70°C operating temperature
- Fully bi-directional 4-quadrant measurements of all energies and powers
- For 4 wire networks with a balanced or unbalanced load
- Direct connection up to 63 A
- Class B according to EN 50470-3 (MID)
- S0 output for energy pulse emission
- Available with MID certification
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Three-phase 80A Energy counter with built-in communication | UEM80
Price range: R5,084.00 through R9,762.00 ex vat
Three-phase 80A Energy counter - Overview

The Three-phase Energy meter is for industrial and domestic applications, with built-in communication. Either: RS485 Modbus RTU/ASCII, M-Bus, or Ethernet Modbus TCP, depending on the module. Available with MID certification suitable for billing. Besides measuring energy, the meter can measure many electrical parameters and make them available on the built-in communication ports. The LCD display shows the energy and instantaneous power. The COM port allows managing the connected meter remotely. Despite transmitting data over RS485, M-Bus or Ethernet the device has a dedicated application for remote management as provided:
- Modbus Master software -> For energy meter management by PC in RS485 Modbus or Ethernet network.
- M-Bus Master software -> For energy meter management by PC in M-Bus network.
- Web server -> Built-in interface for energy meter management by PC in Ethernet network. It enables data recording with manual or automatic data transferring where data is sent to a remote server at the set schedule.
This Three-Phase Energy meter is built according to EN 50470-1 standard. Active energy is compliant with IEC 62053-21 class 1, but for MID certified devices it fulfils class B requirements according to EN 50470-3. The accuracy of reactive energy is compliant with IEC/EN 62053-23 class 2. The wide backlit LCD display has clear graphic symbols for easy reading. Metrological LED on the front panel and sealable terminal covers. The analysis of the MTBF values, the accurate selection of components, and the reduction of the internal working temperatures together with strict production and control standards guarantee a product with excellent quality and reliability.

Three-phase 80A Energy counter - Features
- UEM80-4D R for RS485 Modbus RTU/ASCII communication
- UEM80-D M for M-Bus communication
- UEM80-4D E for Ethernet (Modbus TCP) communication
- Direct connection up to 80 A
- Fully bi-directional 4-quadrant measurements for all energies and powers
- For 4 wire networks with a balanced or unbalanced load.
  M-BUS model can be used also for 3 / 4 wire networks
- Class B according to EN 50470-3 (MID)
- 8 MB for data recording and automatic/manual data transferring (only ETHERNET model)
- S0 output for energy pulse emission
- Available with MID certification
Datasheet

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Single-Phase 80A Energy Meter with built-in communication | UEM80-2D
Price range: R4,939.00 through R8,426.00 ex vat
Single-Phase 80A Energy Meter with built-in communication - Overview

The UEM80-2D Energy meter is for industrial and domestic applications, with built-in communication, depending on the model. Besides measuring energy, the meter can measure many electrical parameters and makes them available on the built-in communication ports. The LCD display shows the energy and instantaneous power. The COM port allows managing the connected meter remotely. Despite transmitting data over RS485, M-Bus or Ethernet the device has a dedicated application for remote management as provided:
- Modbus Master software - for energy meter management by PC in RS485 Modbus or Ethernet network.
- M-Bus Master software - for energy meter management by PC in M-Bus network.
- Web server - built-in interface for energy meter management by PC in Ethernet network. It enables data recording with manual or automatic data transferring where data is sent to a remote server at the set schedule.
This Single-Phase Energy meter is built according to EN 50470-1 standard. Active energy is compliant with IEC 62053-22 class 0,5 S, but for MID certified devices it moreover fulfils class C requirements according to EN 50470-3. The accuracy of reactive energy is compliant with IEC/EN 6205323 class2. A wide backlit LCD display with clear graphics makes reading easy. Metrological LED on the front panel and sealable terminal covers. The analysis of the MTBF values, the accurate selection of components, and the reduction of the internal working temperatures together with strict production and control standards guarantee a product with excellent quality and long-lasting reliability.

Single-Phase 80A Energy Meter with built-in communication- Features
- UEM80-2D R for RS485 Modbus RTU/ASCII communication
- UEM80-2D M for M-Bus communication
- UEM80-2D E for Ethernet (Modbus TCP) communication
- Direct connection up to 80 A
- Fully bi-directional 4-quadrant measurements for all energies and powers
- Class B according to EN 50470-3 (MID)
- 8 MB for data recording and automatic/manual data transferring (only ETHERNET model)
- S0 output for energy pulse emission
- LCD display with 7 main digits
- Available with MID certification
Datasheet

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Three-Phase 4 wire Energy Counter | UEC1P5
R5,659.00 ex vat
Three-Phase 4 wire Energy Counter - Overview

The three-phase 4-wire energy counter is for industrial and domestic applications, available with MID certification suitable for billing. Combined with different external modules, the meter can communicate with other systems. COM modules are available for the most common field protocols. Besides measuring energy, the meter can measure many electrical parameters and makes them available on the built-in IR ports. The LCD display shows the energy and instantaneous power. This Three-Phase Energy meter is built according to the EN 50470-1 standard. Active energy is compliant with IEC 62053-21 class 1, but for MID certified devices it fulfils class B requirements according to EN 50470-3. The accuracy of reactive energy is compliant with IEC/EN 62053-23 class 2. Wide backlit LCD with clear graphic symbols for easy reading. Metrological LED on the front panel and sealable terminal covers. Available versions with different voltage working range for the connection on a 3 or 4-wire network, suitable for balanced or unbalanced loads. The analysis of the MTBF values, the accurate selection of components, and the reduction of the internal working temperatures together with strict production and control standards guarantee a product with excellent quality and reliability.

Three-Phase 4 wire Energy Counter- Features
- For 1 or 5A CT
- Programmable CT ratio
- Fully bi-directional 4-quadrant measurements for all energies and powers
- For 3 / 4 wire networks with a balanced or unbalanced load
- Class B according to EN 50470-3 (MID)
- Tariff input
- 2 S0 outputs for energy pulse emission
- LCD display with 8 main digits
- IR optical port for communication with external modules
- Available with MID certification
Datasheet

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Power Amplifier ±16/20Vpk 1MHz | LPA05

Power Amplifier ±16/20Vpk 1MHz - Overview

The Power Amplifier LPA500 range of power amplifiers from N4L is robust and reliable for use in a variety of industrial and laboratory applications. Designed originally for use with Phase Sensitive Multimeters, they can also be used anywhere where there is a need to boost a signal either in voltage or current. They combine DC accuracy with wide bandwidth to faithfully reproduce complex waveforms, driving loads that may be capacitive, inductive, or resistive. Optionally, the DC component can be eliminated with AC coupling or can be reduced with AC+(DC) coupling. To limit high-frequency noise, the input bandwidth can be reduced with a linear phase, 2nd order, low pass filter for low-frequency applications.

Power Amplifier ±16/20Vpk 1MHz - Features
- DC and AC wide bandwidth
- Switch selectable coupling options: AC, AC+DC, or AC with reduced DC
- Fixed x10 Gain
- Switch selectable bandwidth
- High slew rate
- Isolated BNC or 4mm output sockets
- ±40V peak | 3A rms / 5A peak | (LPA05A resistive load)
- ±16V peak | 5A rms / 8A peak | (LPA05B resistive load)
- Isolated from ground to prevent earth loops
- Robust metal enclosure
Datasheet

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Power Amplifier ±12Vpk 1MHz | LPA01

Power Amplifier ±12Vpk 1MHz - Overview

The Power Amplifier LPA01 range of power amplifiers from N4L is robust and reliable for use in a variety of industrial and laboratory applications. Designed originally for use with Phase Sensitive Multimeters, the LPA01 can also be used anywhere where there is a need to boost a signal either in voltage or current. They combine DC accuracy with wide bandwidth to faithfully reproduce complex waveforms, driving loads that may be capacitive, inductive, or resistive. Optionally, the DC component can be eliminated with AC coupling or can be reduced with AC+(DC) coupling. To limit high-frequency noise, the input bandwidth can be reduced with a linear phase, 2nd order, low pass filter for low-frequency applications.

Power Amplifier ±12Vpk 1MHz - Features
- DC accurate and wide bandwidth
- 1A Peak output current @ up to ±14V peak (LPA01).
- High slew
- Stable into a wide range of loads.
- Isolated to 40V common mode to reject ground loop
- The robust metal enclosure will fit underneath QuanteQ or Veqtor to boost output
- Switch selectable coupling options: AC, AC+DC, or AC with reduced
- Switch selectable precision gain
- Switch selectable
Datasheet

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Power Amplifier ±400Vpk 1MHz | LPA400

Power Amplifier ±400Vpk 1MHz - Overview

The Power Amplifier LPA400 range of power amplifiers from N4L is robust and reliable for use in a variety of industrial and laboratory applications. Designed originally for use with Phase Sensitive Multimeters, they can also be used anywhere where there is a need to boost a signal either in voltage or current. They combine DC accuracy with wide bandwidth to faithfully reproduce complex waveforms, driving loads that may be capacitive, inductive, or resistive. Optionally, the DC component can be eliminated with AC coupling or can be reduced with AC+(DC) coupling. To limit high-frequency noise, the input bandwidth can be reduced with a linear phase, 2nd order, low pass filter for low-frequency applications.

Power Amplifier ±400Vpk 1MHz - Features
- DC accurate and wide bandwidth
- Switch selectable coupling options: AC, AC+DC, or AC with reduced
- Switch selectable precision gain
- Switch selectable
- High slew
- ± 400V peak, 50mA rms (LPA400).
- ± 180V peak, 100mA rms (LPA400B).
- Stable into a wide range of loads.
- Isolated to 40V common mode to reject ground loop
- Robust metal enclosure will fit underneath QuanteQ or Veqtor to boost output
Datasheet

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High-Performance Power Analyzer | PPA4500

High-Performance Power Analyzer PPA4500 Overview

The PPA4500 features high-speed FPGA/DSP sampling techniques and the highly respected “Planar Shunt” Technology. The PPA4500 is the product of over 12 years of research and development. The PPA4500 has improved accuracy, color TFT, front USB port, and faster processing than older models. The PPA4500 is a significant leap forward in both accuracy and functionality. The PPA4500 is suitable for transformer loss testing, PWM inverter drive efficiency testing, standby power testing to IEC62301/EN50564, and many more challenging applications.

The PPA4500 can measure fundamental frequencies up to 2MHz, as well as up to 100 Harmonics with the same 2MHz upper-frequency limit. PWM Motor drive mode enables the engineer to rapidly set up the instrument to measure complex harmonically distorted waveforms, sophisticated signal processing algorithms facilitate high sample rate (2Ms/s) true wideband (2Mhz) analysis of PWM signals. The PPA4500 utilizes parallel digital filtering for fundamental frequency synchronisation without affecting the bandwidth of the measured data.

High-Performance Power Analyzer PPA4500 Features & Benefits
- 0.03% Basic accuracy
- Frequency range DC and 10mHz to 2MHz
- High precision internal shunts
- Superior accuracy to any external shunt
- 5 millidegree phase accuracy for low power factor applications
- Up to 50 Arms (1000 Apk) & 1000 Vrms (3000 Vpk) direct input
- Low current (10Arms), Standard (30Arms), and High current (50Arms) options
- High-speed sampling on all channels (2Ms/s)
- True real-time analysis with no measurement gap
- 1, 2, or 3 phase versions master-slave mode for 4, 5, or 6 phase
- Real-time Digital, Tabular, Graphic, and Oscilloscope displays
- Simple BNC connection of N4L shunts for high-current applications
- RS232, IEEE 488, USB, LAN, Torque, Speed and Extension ports
[embed] https://youtu.be/V0TlkxRY6h0[/embed]

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Programmable Power Sources AC+DC 3kVA ~ 67kVA | N4A

Programmable Power Sources - Overview

The N4A range of Programmable AC Power Sources offers complete flexibility for a wide range of applications. All N4A sources feature dual-channel arbitrary waveform generators utilising direct digital synthesis, providing the user with simultaneous multiple harmonic generations, frequency sweeping, and long sequencing capabilities. The metrology of the arbitrary generator permits long custom waveform sequences to be produced without a reduction in the resolution of each waveform. The N4A AC Source also features a 10-bit vertical resolution and a maximum waveform resolution of 16,384 points to produce a single periodic waveform. There is also an internal storage function for imported custom waveforms featuring user-intuitive library menus that display the waveform graphically on the display.

The N4A AC power sources feature an extremely flexible waveform generator capable of mathematical waveform generation, data point waveform upload, and many sequencing functions. Traditionally, switching topologies have struggled to provide total harmonic distortion (THD) figures below 2%. The N4A “6-legged topology” provides less than 0.3% THD and typically 0.1%, the N4A range of AC Power Sources should be considered the best value power generator on the market. Ranging from the N4A06 6kVA model (300Vrms, 20A) to the N4A67 67kVA model (67kVA, 75A /phase) – the N4A will suit a wide range of applications including;
- Aerospace
- Renewable Energy
- Compliant to IEC61000-3-2/12 and IEC61000-3-3/11 Harmonics and Flicker Testing
- Compliant to IEC61000-4-11 Voltage Dips and Interrupts immunity test standard
- IEC61000-4-13 harmonic and inter-harmonic susceptibility test standard
- PWM Inverter Drive Development
- Automotive
- Standby Power
- Battery Development
Programmable Power Sources -Features
- Low THD <0.3% (0.1% typical)
- DC+AC Output - DC-1kHz (10kHz small signal bandwidth)
- Single Phase and 3 Phase systems available
- EMC Compliance - IEC61000-3-2/3/11/12, IEC61000-4-11/13/17/29
- Market Leading Inrush - 2x Continuous Output for 3 seconds
- Fast Switch on Time - Proprietary Design
- Versatile interfaces - RS232, USB, LAN
- Arbitrary Waveform - Custom Arbitrary Waveform, Sequencing and More
- Pre Set Waveforms - Stored in Hardware for Fast Recall
- High Efficiency >80%
- Up to 67kVA 3 Phase Solutions
- Compact Design - High Power Density
Datasheet

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Power Analyser | PPA1500

Power Analyser PPA1500 - Overview

The PPA1500 Power Analyser offers higher performance compared to its sibling – the PPA500 unit. N4L power analysers provide optimum solutions in almost any power measurement application and budget. The PPA1500 offers a 1Mhz Bandwidth and full graphic display, this includes harmonic bar graphs and graphic data logging. It features sophisticated parallel digital filtering algorithms enabling the PPA1500 to be used in various Pulse Width Modulated applications.

While being only half-rack width and 2U high, the PPA1500 is available in 1, 2 or 3-phase configurations and offers a level of performance normally found only in larger and more costly instruments. With modes such as “Inrush Current and “Standby Power”, the PPA1500 provides fast, accurate and easy measurements in challenging environments.

The PPA1500 series analysers now have a 6 Phase 2U Rack option in which two PPA1530 units are installed on the same rack side by side to give the ability to perform 6 Phase 0.1% accurate power measurement whilst only occupying a height of 2U in any rack.

All PPA1500 units are supplied with UKAS ISO17025 certification as standard, this is performed at N4L in the UK in our accredited ISO17025 Laboratory.

Power Analyser PPA1500 - Features
- High contrast full-colour graphic display
- Simple BNC connection of N4L shunts for high-current applications
- RS232, USB, LAN, Extension and Auxiliary ports
- 0.05% Basic accuracy
- Frequency range DC and 10mHz to 1MHz
- High-precision internal shunts – Superior accuracy to any external shunt
- 10 millidegree phase accuracy – Necessary for low power factor applications
- 20 Arms (300 Apk) & 1000 Vrms (2500 Vpk) direct input
- Unique x10 gain mode for Standby Power measurement
- 1MS/s High-speed sampling on all channels
- True real-time analysis with no measurement gap
- 1, 2 or 3 phase versions
https://www.youtube.com/watch?v=AUGd54KrkfE

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Benchtop Power Analyzer up to 8 Phase Analysis | PPA3500

High-Performance PPA3500 up to 8-Phases Power Analysis Overview

The PPA3500 is a high accuracy 3~6 phase power analyzer able to perform reliable, accurate power analysis in a variety of applications. DUT to innovative analogue card design, the PPA3500 is packaged in a compact 2U chassis. The PPA3500 is available in 3, 4, 5 or 6-phase configurations. The PPA3500 power analyzer benefits from a full colour “Dual” TFT display, this concept employs two TFT displays within one instrument, allowing for a large widescreen display area in a 2U form factor. There is also the option to install the unit in a 19"| rack providing a 2U 6 Phase solution, see accessories for more details.

Proprietary Technology featuring the industry-renowned planar shunt technology (A shunt design topology developed by N4L) and FPGA based real-time no-gap analysis techniques, the PPA3500 is able to provide groundbreaking 6-phase analysis performance. Real-Time no gap analysis ensures efficiency measurements are entirely synchronized between input and output.

All PPA3500 units are supplied with UKAS ISO17025 certification as standard, this is performed at N4L in the UK in our accredited ISO17025 Laboratory.

6 phase Power Analyzer Features
- Designed specifically for inverter drive applications
- Excellent Accuracy 0.03%
- Wide Bandwidth ideal for distorted signal analysis such as PWM Inverter drives
- 1MHz Bandwidth
- Torque and Speed inputs fitted as standard +/- 10V, Analogue DC and Pulsed Inputs
- Extremely high accuracy phase measurement of 0.01deg
- Real-time monitoring and efficiency calculation of Electrical to Electrical and Electrical to Mechanical
- ISO17025 (UKAS) traceable certification supplied
- 8 Phase Analysis Use 3P2W + CH3 + 3P2W + CH3 to measure 8 phases including 3 Phase Input Power, DC Bus and 3 Phase Output Power
- Low profile – 2U High, up to 6 Phase measurement
- DFT Based Power Calculation Utilize the Power of DFT Fourier analysis, made possible using top-of-the-range DSPs and FPGAs
- PWM Motor drive mode for quick easy setup
https://www.youtube.com/watch?v=ntKljPrXvYM

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Transformer Edition Power Analyzer | PPA5500-TE

Transformer Edition Power Analyzer - Overview

The PPA5500-TE provides unrivalled measurement integrity, reliability and accuracy. Each and every PPA5500-TE is rigorously tested within N4L’s ISO17025 Accredited Power Laboratory in which specialised power calibration from 40Hz to 450Hz is performed alongside N4L’s well-documented wideband calibration, up to 2MHz. The PPA5500-TE is compliant to IEC60076-8 and provides a 3-year warranty as well as a 2-year calibration interval. Power Transformer loss analysis becomes challenging when the transformer is off-load (for example whilst performing core loss analysis), this test condition requires the power analyzer to exhibit exceptional phase angle accuracy and repeatability. The PPA5500-TE provides market-leading low power factor analysis, supplied with UKAS ISO17025 certification.

Transformer Edition Power Analyzer - Features
- 0.07% Nominal Power Accuracy
- 0.55% Power Accuracy at PF=0.01
- 0.003° Phase accuracy
- Widest Voltage, Current and Frequency range in the market
- Unrivalled Performance, Unquestionable Traceability
Datasheet

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4
Power Analyzer Compact Three Phase – PPA500

Power Analyzer Compact Three Phase - Overview

The PPA500 is a high-performance power analyser at a low cost. Primarily aimed toward applications that require precision measurement without complex features, the PPA500 series is ideally suited to a production or test environment. This power analyser achieves a level of performance previously available only in costly instruments while maintaining the intuitive operation and clarity of measurement presentation for which the PPA series has become renowned. The unit benefits from a full-colour TFT display that provides great flexibility and combines performance, ease of use and value. While being only half-rack width and 2U high, the PPA500 is available in 1, 2 or 3 phase configurations. Features such as the planar shunt (A shunt design topology developed by N4L) and FPGA based real-time no gap analysis techniques all contribute to the PPA500’s fantastic offering. The low cost of the PPA500 Power Analyser presents a great opportunity for system integrators looking for accurate, traceable, reliable power analysis.

Power Analyzer Compact Three Phase - Features
- 0.05% Basic accuracy (Traceable to ISO17025)
- Frequency range DC and 10mHz to 500kHz
- High precision internal shunts Superior accuracy to any external shunt
- 10 milli degree phase accuracy – Necessary for low power factor applications
- 20 Arms (300 Apk) & 1000 Vrms (2500 Vpk) direct input
- Unique x10 gain mode for Standby Power measurement
- High-speed sampling on all channels
- True real-time analysis with no measurement gap
- 1, 2 or 3 phase versions
- High contrast full-colour graphic display
- Simple BNC connection of N4L shunts for high current applications
- RS232, USB, (LAN Option), Extension and Auxiliary ports
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Precision Power Analyzer | PPA5500

Precision Power Analyzer - Overview

The PPA5500 Power Analyzer is a compact, cost-effective, leading power measurement performance instrument. It has exceptional accuracy and stability in the most demanding of power applications. The Power Analyzer 5500 series extends the power analysis range for those who require the ultimate power analysis product.

The PPA5500 adds increased voltage and current measurement ranges, greater processing power, increased memory, a real-time clock, high contrast visible colour display, 1GB non-volatile internal memory, external USB memory port, wide frequency range and exceptional noise rejection. A 2MS/s sample rate, alongside “True Real-Time” no gap analysis is a formidable combination for power analysis. The analogue front-end design includes the proprietary "Planar shunt technology". This instrument provides exceptional measurement stability and accuracy. The phase angle accuracy of the PPA5500 is 0.005 degrees which are perfect for transformer loss analysis testing at very low power factors.

Precision Power Analyzer - Features
- 0.01% Basic accuracy
- Frequency range DC and 10mHz to 2MHz
- High precision internal shunts Superior accuracy to any external shunt
- 5 millidegree phase accuracy necessary for low power factor applications
- Up to 50 Arms (1000 Apk) & 1000 Vrms (3000 Vpk) direct input
- Low current (10Arms), Standard (30Arms), and High current (50Arms) options
- High-speed sampling on all channels
- True real-time analysis with no measurement gap
- 1, 2, or 3 phase versions master-slave mode for 4, 5, or 6 phase
- Real-time Digital, Tabular, Graphic, and Oscilloscope displays
- Simple BNC connection of N4L shunts for high-current applications
- RS232, IEEE 488, USB, LAN, Torque, Speed and Extension ports
https://www.youtube.com/watch?v=ntKljPrXvYM

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