Built upon the technology of its predecessor, the 2558A, the LS3300 is an AC signal generator capable of outputting both current and voltage simultaneously, thus allowing it to calibrate power meters. Providing output ranges of 10mV-1250V, and 0.3 mA to 62.5 A, and upto 78.125 kW, the unit is capable of calibrating up to 0.15 % Class Power meters. New features on the LS3300 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.

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%

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

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.

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.

 (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.

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.

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.

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.

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.

(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.

Communication interface

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