LS3300 AC Power Calibrator

Built upon Yokogawa's history of developing superior sourcing instruments, the LS3300 is an AC signal generator capable of outputting both current and voltage simultaneously, thus allowing it to calibrate power measurement instruments such as current clamps/transformers, panel meters, RMS multimeters, and power meters. The LS3300 boasts 78.5kW per unit, with user-configurable current, voltage, frequency and phase settings. New features include a high definition LCD display, a vector diagram, and the ability to synchronize up to three units to emulate anything from single phase two wire to three phase four wire systems.

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Your go-to solution for accurate and reliable calibration of AC power measurement devices

The LS3300 features ease of use, powerful dedicated functionality, and high precision sourcing capabilities.  

Ease of Use

  • Featuring an intuitive interface, users can quickly and easily adjust the voltage, current, frequency and phase values to suit their application. 
  • A high definition LCD display allows for clean and clear data visualization

Dedicated Functionality

  • Armed with various functions perfectly tailoried for power measurement verification ranging from signal ramping, stepping, and triggering to synchronization for multi-phase power generation
  • Vector display for tracking current/voltage phase relationships
  • DC output for testing shunt inputs on power meters
  • Software to automatically verify economy-class power meters and generate calibration reports

High precision sourcing capabilities

  • Independently source voltage and current sine waves into the kilohertz range with a high degree of accuracy and resolution
  • High test uncertainty ratio with most economy class power meters and measuring devices make it a trusted reference for instrument verifiication and callibration

24 Hour Stability Chart

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.


Guaranteed accuracy for every situation

V/I/P Accuracy

AC Voltage: ±350 ppm
AC Current: ±450 ppm
AC Power: ±450 ppm
At 1 year, 10 ppm = 0.001%

Phase Accuracy

±0.03º at 50/60 Hz
Between the Voltage and current outputs when used alone.

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.

Wide generation range

AC voltage: 10 mV to 1250 V
AC current: 0.3 mA to 62.5 A
Frequency: 40 to 1200 Hz


Support for any and all types of power measurement devices

Single to three phase power calibration

A single LS3300 AC Power Calibrator 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.

LS3300 Wiring System Setting 1P2W

Wiring system setting

LS3300 Current Value Setting 1P2W

Current value setting

Synchonization for multi-phase calibration

Control and output of three phase power

Multiple LS3300 AC Power Calibrators can be synchronized through BNC cables. The host can then connect all units to the master unit via a USB cable and adjust settings simultaneously 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.

LS3300 Example Of 1P3W And 3P3W

Example of 1P3W and 3P3W

LS3300 Example Of 3P3W

Example of 3P3W (three voltage three current) /3P4W

(1) Outputting balanced three-phase signals

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, and  a shutdown of the output is initiated.

(2) 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 on the slave side.

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.

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.

LS3300 Current Output To 180A



Support calibration of shunts and DC inputs

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 the auxiliary output is  0 to 6.25 V.
Users can select either the 500 mV or 5 V range according to the range of a current sensor input.

LS3300 Diversification By AUX Output

Endless array of features to simplify calibration of power measurement devices

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 able to view the unit information such as the serial number, firmware 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.

LS3300 LCD For Enhanced Viewing

Reduced calibration times

(1) Notification of output stabilization

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

LS3300 Stabilizing Indication

Safety features during calibration

(1) High voltage notification

This function notifies users of dangerous high voltage conditions when using high voltage ranges (300 or 1000 V). When the voltage output is set to 150 V or higher, the device beeps intermittently to notify users.

LS3300 High Voltage Notification

(2) Trip detection

If a connected  load  causes the output range to be exceeded, the Yokogawa LS3300 detects the abnormal load conditions to protect itself. This function monitors the error of overcurrent, 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 verifying interferences from the power source.

(4) Calibration software

The LS3300 calibration software allows a user to automatically run through the quality inspection standards tests for WT series power meters, as well as generate a report indicating PASS/FAIL, tolerance levels, and percentage error

Support for all commonly used communication interfaces

Communication interface

The LS3300 AC Power Calibrator is equipped with USB, Ethernet and GP-IB as standard communication interface to control external devices remotely.

LS3300 Communication Interface


Power Factor Validation

Power factor is an important element when users judge the efficiency of a device. Both power value and power factor are inspected during the calibration of a power meter. The LS3300 supports a power factor range 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.

LS3300 Power Factor

LS3300 Power Factor Phase Setting

Inspection of phase meter

Since the LS3300 guarantees the phase accuracy between the master unit voltage (V1) and the slave unit voltage (V2), it can also be used to inspect phase meters. It is equipped with the phase accuracy of ±0.03° and the minimum resolution of 0.001°, which 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 and unit need to be connected with each other via a BNC cable for phase synchronization.

LS3300 Inspection Of Phase Meter

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 highly accurate LS3300 can output voltage with an accuracy of 350 ppm and current with an accuracy of 450 ppm It can also output AC voltage/current separately and set the phase angle of power. With these features, it supports input/output characteristic adjustment,inspection in the power transducer production lines, and calibration inspection for periodic checkups.

LS3300 Input Adjustment 1

LS3300 Input Adjustment Voltage Setting

Needle sticking tests

This AC power calibrator is able to perform the Needle sticking tests with high reproducibility. If users stops sweeping halfway and hold the value near an arbitrary point, he/she can change the level ratio manually and perform an up/down sweep again. Users can set the sweep time to 8 s, 16 s, 32 s, or 64 s and the sweep range from 0% to 100%, 0% to 105%, 0% to 110%, or 0% to 120% of the output level. While the LS3300 can sweep voltage or current, it cannot sweep both simultaneously.

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

LS3300 Needle Sticking Test

LS3300 Renumbered

Front of Unit Back of Unit
  1. LO TO EARTH LAMP (voltage)
  2. LO TO EARTH LAMP (current)
  4. Current output terminals
  5. Voltage output terminals
  6. AUX output terminal
  7. OUTPUT ON/OFF key
  8. Output select key
  1. Output terminals for synchronized operation
  2. Input terminals for synchrenized operation
  3. Functional ground
  4. USB port
  5. Ethernet port
  6. GP-IB connector
  7. Link interface (UNIT2/UNIT3)

LS3300 Power Linearity

Example of Power Linearity Characteristic

LS3300 Power Stability

Example of Power Stability Characteristic

LS3300 Power Accuracy

Example of Frequency - Power Accuracy Characteristic

LS3300 Phase Stability

Example of Phase Stability Characteristic

Comparison with the 2558A (1 year)

AC Voltage
Guaranteed accuracy range
10 mV to 1250 V
1.00 mV to 1200.0 V
Accuracy 50/60 Hz
±350 ppm
±500 ppm
AC Current
Guaranteed accuracy range
0.3 mA to 62.5 A
1.00 mA to 60.0 A
Accuracy 50/60 Hz
±450 ppm
±650 ppm
Output range
40 to 1200 Hz
40 to 1000 Hz
±100 ppm
±100 ppm
AC Power
Guaranteed accuracy range
Range of voltage, current and frequency
mentioned above
Accuracy 50/60 Hz
±450 ppm
Power stability
±100 ppm
Power factor (Lead/Lag)
−1 to 0 to 1
Phase angle
−180.000° to 359.999°
Maximum output
Approx. 36 VA
Approx. 36 VA
dimensions (mm)
426 (W) × 132 (H) × 450 (D)
426 (W) × 132 (H) × 400 (D)

Output Range

AC Voltage

Output Range
Maximum Output
Output Resistance *2
1 V
0 to ± 1.25000 V
10 μV
0.5 A or more
6 mΩ or less
10 V
0 to ± 12.5000 V
100 μV
Approx. 600 mA

6 mΩ or less

30 V
0 to ± 37.5000 V
100 μV
Approx. 60 mA
6 mΩ or less
100 V
0 to ± 125.000 V
1 mV
Approx. 60 mA
6 mΩ or less
300 V
0 to ± 375.000 V
1 mV
Approx. 20 mA
6 mΩ or less
1000 V
0 to ±1250.00 V
10 mV
Approx. 6 mA
6 mΩ or less

AC Current

Output Range
Maximum Output
30 mA
0 to ± 37.5000 mA
0.1 μA
Approx. 15 V
100 mA
0 to ±125.000 mA
1 μA
Approx. 15 V
1 A
0 to ± 1.25000 A
10 μA
Approx. 15 V
10 A
0 to ± 12.5000 A
100 μA
Approx. 3 V
50 A
0 to ± 62.500 A
1 mA
Approx. 0.6 V


Output Range
Maximum Output
Output Resistance *2
500 mV
0 to ±625.00 mV
10 μV
Approx. 0.1 mA
1 Ω or less
5 V
0 to ± 6.2500 V
100 μV
Approx. 5 mA

1 Ω or less

*1: The output level can be set up to 120% of the range. For outputs exceeding 120%, the ratio must be set to 100% or higher.

*2: When 758933, 758917, or B8506ZK is in use; excluding aging and the effects of measurement leads

LCA Reduced energy, emission of CO2, NOx and SOx about 50% compared to the previous model.

PDFResults of Life Cycle Assessment

366924 BNC to BNC 1m Cable

  • 366924 BNC to BNC cable for oscilloscope 
  • 1m BNC wire
  • Simultaneous measurement with 2 units
  • Input external trigger signal

758917 DMM Measurement Lead Set

  • Set of 0.8m long red and black multimeter test leads
  • Used in combination with a pair of optional 758922 or 758929 alligator-clip adapters
  • 1000 Vrms, 32 Arms CAT II

758921 Fork terminal adapter

  • 758921 Fork Terminal Adapters
  • For fitting a 4mm banana plug to a fork terminal
  • One black and one red clip
  • 1000 Vrms-CAT II

758922 Small Alligator-Clip Adapter 300V

Rated at 300 V. Attaches to the 758917 test leads. Sold in pairs.

758923 Spring Hold Safety Terminal Adapter Set

Two adapters in a set (spring-hold type).

758929 Large Alligator Clip Adapter 1000V

  • Yokogawa 758929 Alligator Clip Adapter 
  • Rated at 1000V
  • Attaches to 758917 test leads
  • Sold in pairs black/red

758931 Screw-Fastened Safety Voltage Terminal Adapter Set

Screw-fastened adapters. Two adapters in a set. 1.5 mm Allen Wrench.

758933 Measurement lead

2 pieces (red and black) in 1 set
length: 1.00 m
Used in combination with the 701959, 758921, 758922, or 758929
Rating: 1000 V CAT III/19 A

A1421WL USB Cable

Total length: 2 m
USB2.0 Hi-Speed

B8506WA Measurement Lead Set

2 pieces (red and black) in 1 set.
Length: 1.5 m, Rating: 80 A

B8506ZK Measurement Lead Set

2 voltage output cables (red and black). 1 m. Rating 1500 V

B8506ZL Alligator Clipadapter Set

2 safety terminal - alligator clip adapters (red and black). Rating 1500 V

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