This chart shows the voltages and plug styles used throughout the world. Note that some countries have changed their standards, and some have multiple standards. per wall plug is typically not dependent on voltage. We hope that this Phone / Fax / Addresses High Voltage Power Supplies/ DC Power Supplies, High Voltage Power Supplies, AC Power Supplies, Electronic Loads Matsusada's high quality and reliable DC power supplies can easily satisfy your requirements for your OEM or laboratory applications. From this page you can access our full range of products and search to find the DC power supply which best suits your application. Varieties of high performance AC power supplies with versatile functions and high power in compact size. Such compactness and high efficiency is realized with proprietary switching amplifier method. Lineups include models with both AC and DC outputs or with 3 phase outputs, and they are ideal AC supplies for evaluation of all kinds.

Fast Frequency response, compact 4-quadrant bi-polar power supply and high voltage amplifier. 100 ton ac unitModels include super fast respose and/or integrated function wave generator are available. 3 ton ac unit reviewsIdeal for evaluations for; ac units for narrow windowsSolar cell panel, mortors and surface treatment application. High Voltage Power Supplies(Handy type / Rack-mount type) High voltage power supplies of [High Power] [Low Noise] and [Excellent Reliability]. With accumulated proprietary know-how, both high performance and high reliability are achieved for our onboard type, module type, bench top and rack mount power supplies. High Voltage Power Supplies(Module type / PCB mountable type) High voltage power supplies with [Compact size], [Low Noise] and [High Reliability].

These high voltage power supplies support various demands from highly precise measurement devices. Electric load which accepts high voltage and high power operation. These are the best devices for a lifetime evaluation for primary or secondary batteries and DC power supply or aging applications. With the master-slave operation feature, it is possible to operate more than 30 units in parallel. Charge-Discharge Power Supplies with High resolution D/A or A/D converter. This vast range of products support Charge-discharge tests for various batteries. The Sequence Software for Power Supplies Dedicated software that enables sequence operation of various power supplies, electric load, and digital controller for power supply made by Matsusada Precision with simple setting. This series is optimum for performance test and various simulation tests for DC power supply, various electronic parts, and electric components for vehicles. Digital Controller / Interface converter

Digital controllers are used to precisely control Matsusada DC, AC and HV power supplies and electrical load devices. Its compact design does not allow you to choose the location to control. Models with optical communication are also available, which is indispensable for high voltage application or applications with large electrical noise. Accessories for Power Supplies A large benificial list of accessories for Matsusada's product are listed here. Depending on the requirement of your application and usage, these accessories are available.An AC voltage measurement is needed to calculate real power, apparent power and power factor. This measurement can be made safely (requiring no high voltage work) by using an AC to AC power adaptor. The transformer in the adapter provides isolation from the high voltage mains. This page briefly covers the electronics required to interface an AC to AC power adapter with an Arduino. As in the case of current measurement with a CT sensor, the main objective for the signal conditioning electronics detailed below, is to condition the output of the AC power adapter so it meets the requirements of the Arduino analog inputs: a positive voltage between 0V and the ADC reference voltage (Usually 5V or 3.3V - emontx).

AC to AC power adapters are available in many voltage ratings. The first thing important to know is the voltage rating of your adapter. We have made a reference list of the main AC voltage adapters that we have used (we have standardised on a 9V RMS adapter). The output signal from the AC voltage adapter is a near-sinusoidal waveform. If you have a 9V (RMS) power adapter the positive voltage peak be 12.7V, the negative peak  -12.7V. However, due to the poor voltage regulation with this type of adapter, when the adapter is un-loaded (as in this case), the output is often 10-12V (RMS) giving a peak voltage of  14-17V. The voltage output of the transformer is proportional to the AC input voltage, see below for notes on UK mains voltage. The signal conditioning electronics needs to convert the output of the adapter to a waveform that has a positive peak that's less than 5V (3.3V for the emonTx) and a negative peak that is more than 0V. The waveform can be scaled down using a voltage divider connected across the adapter's terminals, and the offset (bias) can be added using a voltage source created by another voltage divider connected across the Arduino's power supply (in the same way we added a bias for the current sensing circuit).

Here's the circuit diagram and the voltage waveforms: Resistors R1 and R2 form a voltage divider that scales down the power adapter AC voltage. Resistors R3 and R4 provide the voltage bias. Capacitor C1 provides a low impedance path to ground for the AC signal. The value is not critical, between 1 μF and 10 μF will be satisfactory. R1 and R2 need to be chosen to give a peak-voltage-output of ~1V. For an AC-AC adapter with an 9V RMS output, a resistor combination of 10k for R1 and 100k for R2 would be suitable: The voltage bias provided by R3 and R4 should be half of the Arduino supply voltage. As such, R3 and R4 need to be of equal resistance. Higher resistance lowers energy consumption. For a battery powered emonTx, where low power consumption is important, we use 470k resistors for R3 and R4. If the Arduino is running at 5V the resultant waveform has a positive peak of 2.5V + 1.15V = 3.65V and negative peak of 1.35V satisfying the Arduino analog input voltage requirements.

This also leaves some "headroom" to minimize the risk of over or under voltage. The 10k and 100k R1 and R2 combination works fine for an emonTx powered at 3.3V, with a positive peak of 2.8V and a negative peak of 0.5V. If you would like detailed information on how to calculate the optimum values for the components, taking component tolerances into account, see this page. To use the above circuit along with a current measurement to measure real power, apparent power, power factor, Vrms and Irms upload the Arduino sketch detailed here: Arduino sketch - voltage and current This relatively simple voltage bias source does have some limitations. See Buffered Voltage Bias for a circuit that offers enhanced performance. The standard domestic mains supply for Europe is 230 V ± 10%, giving a lower limit of 207 V and an upper limit of 253 V. It is permissible under BS 7671 to have a voltage drop within the installation of 5%, which would give a lower limit of 195.5 V.