Effective solution for AC power calibration

LS3300 AC Power Calibrator
Precision Making

Yokogawa has been supplying precision measuring instruments of the highest quality for over 100 years.

Power meters and measuring instruments must adhere to strict standards to not only make precise voltage and current measurements, but to reliably and accurately calculate power and phase. Thus, calibration of these instruments to maintain integrity and lifespan is of utmost importance to the test and measurement industry. It is with this in mind that Yokogawa is proud to release its latest high precision power calibrator, the LS3300.

The LS3300 provides:

- Technology: The LS3300 delivers best-in-class power accuracy of ±450 ppm and high output current of 62.5 A.

- Confidence: Yokogawa's attention to quality ensures engineers have the peace of mind knowing that the LS3300 is designed to meet the high stability and accuracy needed for testing power meters.

- Operability 一 Combining flexibility of single to three phase calibration and a suite of features for power meter validation, The LS3300 is an excellent choice for efficient, expeditious calibration.

Major instruments subject to calibration:

Major Specifications
The LS3300 is a single-phase AC power calibrator that can generate highly accurate, stable, and wide range output current and voltage. New features include an LCD display and a “STABILIZING function” which shows that the output signal is stabilized for calibration efficiency.

High accuracy

- AC voltage: ±350 ppm

- AC current: ±450 ppm

- AC power: ±450 ppm

* At 1 year,10 ppm = 0.001%

High stability

- AC voltage, current: ±50 ppm/h

- AC power: ±100 ppm/h

* From 1 minute to 1 hour after the output is turned on.

Phase accuracy

- ±0.03° at 50/60 Hz

* Between the Voltage and current outputs when used alone.

Wide generation range AC voltage

- 10 mV to 1250 V

- AC current: 0.3 mA to 62.5A

- Frequency: 40 to 1200 Hz

Major Features

Single to three-phase power calibration

A single LS3300 unit supports 1P2W, and multiple LS3300 units support 1P3W, 3P3W and 3P4W. It can calibrate AC voltage/ current, active/reactive power, power factor and phase angle.

Control and output of three phase power

Multiple LS3300 units can be synchronized through BNC cables. The host can then connect to the master unit via a USB cable and adjust the settings on all units through the master/slave communication. Users can set the values of voltage, current, power, power factor, wiring, and phase from the front panel of the master unit and view each phase in a phase chart in the LCD. Checking the output of each unit from the master unit during three-phase output is done by navigating to [CONFIG] > [Unit] key > menu.

When changing the wiring from 3P3W (three voltages three currents) or 3P4W to 1P3W or 3P3W, users can select from among T phase reference using UNIT2 and S phase reference using UNIT3. The LS3300 supports both references because the reference differs depending on each power meter. They can use either phase reference by setting it on the master unit as needed.

(1) When outputting balanced three-phase

In the case of balanced phase signals, when users modify settings on the master unit, values on the slave units are set accordingly. Synchronous communication allows output setting changes on the master unit to be migrated to the slave unit. If a fault such as an overload occurs in the slave unit, this information will be conveyed to the master unit, then initiate a shutdown of output.

(2) When outputting unbalanced three-phase signals

In the case of unbalanced phase signals, users set the conditions of a balanced state for the slave units on the master unit. Then they change the phase setting into single-phase and manually set conditions of the unbalanced phase state of each phase of the slave side.

On-site calibration service

Large current output up to 180 A

When users synchronize three units and connect their output in parallel, the system can output up to 180 A, when [Hi Current] is specified in the Wiring menu. LS3300 supports devices requiring large current such as a current sensor, smart meter, etc.

Diversification of the calibration equipment by AUX output

A large current sensor used for industrial equipment and a clamp-on power meter used to monitor energy-saving are widely used in the power measurement market. When a clamp-on power meter unit or external current sensor input (voltage output) is calibrated, an AUX terminal is used. The voltage output range of a current sensor signal (Ext. Sensor) is 0 to 6.25 V. Users can select either the 500 mV or 5 V range according to the output range of a current sensor.

LCD for enhanced viewing capabilities

The LS3300 is equipped with a 5.7-inch color LCD. It shows the wiring and power settings, as well as the phase chart of the generated waveforms, allowing users to quickly and easily view the instrument settings (as seen below). Users are also be able to view the unit information such as the serial number, version information, and communication settings in the UTILITY menu. The values of voltage, current, active power and reactive power specified according to the level, level ratio and power factor are displayed as output values.

Applications

Power Factor Validation

The power factor is an important element when users judges the energy utilization efficiency of a device. When a power meter is calibrated, accordingly, the power factor value is inspected as well as a power value. The LS3300 covers the range of the power factor from −1.0 to 0 to +1.0 (lead) and from −1.0 to 0 to +1.0 (lag). It also allows the user to adjust the phase angle between voltage and current.

In/output adjustment inspection of power transducer

There are different kinds of power transducer instrumentation for AC voltage, current, active power, reactive power, etc. The LS3300 can perform highly accurate output (the voltage accuracy of 350 ppm and current accuracy of 450 ppm), output AC voltage/current separately and set the phase angle of power. With these features, it supports input/output characteristic adjustment and inspection in the power transducer production line and calibration inspection for periodic checkups.

Inspection of phase meter

Since the LS3300 guarantees the phase accuracy between units of the master unit voltage (V1) and the slave unit voltage (V2), it can inspect a phase meter. It is equipped with the phase accuracy of ±0.03°and the minimum resolution of 0.001°and allows users to specify an arbitrary value for Lead and Lag of the slave unit voltage (V2) against the master unit voltage (V1).

*The master unit and the slave unit are needed to be connected with each other via a BNC cable for phase synchronization.

Needle sticking tests

This instrument is able to perform the Needle sticking tests with high reproducibility. If users stop sweeping halfway and holds the value near an arbitrary point, s/he can change the level ratio manually and perform up/down sweep again. Users can set the sweep time to 8 s, 16 s, 32 s, or 64 s and the sweep range to 0% to 100%, 0% to 105%, 0% to 110%, or 0% to 120% of the output level. While sweeping voltage (or current), it cannot sweep current (or voltage).

*Power factor and Phase are not available in the sweep function.

Convenient features for calibration

Shortening of calibration time

(1) Notification that output becomes stable

To improve working efficiency, the LS3300 is equipped with a function for notifying the user that the output is stable. When the STABILIZING indication disappears from the LCD two seconds later, it means that the output has become stable. This reduces time spent on working with transient signals that affect measurement accuracy.

Safety of calibration

(1) High voltage notification

This is a function for notifying users of dangerous high voltage condition when the high voltage range (300 or 1000 V) is set. When the voltage output is set to 150 V or higher, the device beeps intermittently.

(2) Trip detection

If a load that would cause the output range to be exceeded is connected, this instrument detects the abnormal load to protect itself. This function monitors the error of overcurrent and overvoltage, oscillation, fan malfunction and temperature.

(3) LINE synchronization

The output frequency of this product can be synchronized with commercial power frequency. This feature is useful in checking interference from the power source..

On-site calibration service

Other power calibration systems in the market utilize a master/slave interface where-in the slave units cannot be operated standalone for single-phase output. Each LS3300, on the other hand, is capable of both independent single phase output, as well as synchronized three phase output. Its excellent portability enables feasible on-site calibration service.

Power Meter Calibration Software (Free software)
Automatically calibrates a power meter (WT series) using YOKOGAWA’s AC Power Calibrator LS3300 or Precision DC Calibrator 2560A.

Reduction of calibration time
Example: Calibrating WT310E AC at 52 points Manual calibration time: Approx. 20 min -> Calibration software: Approx. 2 min 40 sec.

Specifications

• Calibration Target Instruments WT300E, WT300, WT200, WT100 series

• Testable point Output range of LS3300 (AC) and 2560A (DC)

• Supported communication interface USB, GP-IB, ETHRNET, RS-232

How to download (free of charge)

Registered users can download the software free of charge from our HP. https://tmi.yokogawa.com/library/documents-downloads/software/powermeter-calibration-software/

Sample program

We provide a free sample program and driver for each communication interface (USB, Ethernet, and GP-IB) on our website for the convenience of users. https://tmi.yokogawa.com/library/documents-downloads/software/ls3300- sample-programs/.

Basic characteristic examples showing high accuracy and stability

Comparison table to the 2558A (1 year)

Specification

Accuracy

Conditions

Frequency: Using the internal oscillator

Load: Pure resistance

Temperature, humidity: 23°C ±3°C, 20% RH to 80% RH

When the temperature is in the range of 5°C to 20°C or 26°C to 40°C, add the temperature coefficient.

Output terminals: LO terminal grounding Measurement bandwidth: Up to 50 kHz

Specification

*3: For phase setting Ø, power factor PF = cosØ

Equation for calculating the value to add to the active power accuracy for the phase error (ΔØ)

-PWRerror (%) = 100 × {cosØ – cos (Ø + ΔØ)}

-Example: For 60 Hz, phase Ø = 60°, ΔØ = +0.03° PWRerror (%) = 100 × {cos (60) – cos (60.03)} = 0.0453%

*4: Add 0.005% of range for AUX output.

*5: The output range that the power accuracy applies to is for when the voltage and current (including AUX) are at least 1% of the range.

*6: Includes the accuracy specification when LINE synchronization is set. However, no fluctuation in the LINE frequency or duty ratio is assumed.

*7: For phase setting Ø, power factor PF = sinØ Equation for calculating the value to add to the reactive power accuracy for the phase error (ΔØ) VARerror (%) = 100 × {sinØ – sin (Ø + ΔØ)} Example: For 60 Hz, phase Ø = 60°, ΔØ = +0.03° VARerror (%) = 100 × {sin (60) – sin (60.03)} = −0.0262%

*8: Add 0.005% of range for AUX output.

*9: The output range that the power accuracy applies to is for when the voltage and current (including AUX) are at least 1% of the range

*10: Includes the accuracy specification when LINE synchronization is set. However, no fluctuation in the LINE frequency or duty ratio is assumed.