2558A AC VOLTAGE CURRENT STANDARD

  • The 2558A is a low-cost, high-precision instrument capable of outputting a wide range of AC voltages and currents for the calibration of electric meters and other devices. In terms of accuracy and other performance characteristics, this new model is a significant upgrade from our previous model, the 2558 AC voltage current standard, which was introduced in 1979 and discontinued in 2003.
  • Providing output ranges of 1.00 mV to 1200.0 Volts AC, and 1.00 mA to 60.00 Amps AC makes the 2558A the product of choice for the cost effective calibration of AC analog meters and other AC measuring instruments. Front panel controls and various computer interfaces enable the 2558A to be intuitively operated manually or controlled by an ATE system.

Product Description

The 2558A AC Voltage Current Standard offers users the simple operation and reliability customers have come to trust from Yokogawa.

  • Sweep (Voltage/Current/Frequency)

  • Output Divider

  • Direct Readout of the Deviation

  • Digital Display of Output

  • Common Current Output Terminals

  • High Accuracy

  • High Stability

  • Wide Output Range

  • Wide Frequency Range


The wide output ranges of 1.00 mV to 1200.0 V AC and 1.00 mA to 60.00 A AC mean that the 2558A is the instrument of choice for the cost effective calibration of AC analog meters. Rotary controls and a range of computer interfaces enable the 2558A to be intuitively operated through the frontpanel or controlled by an ATE system.

High Accuracy


AC Voltage: +/- 0.04 %
AC Current: +/- 0.05 %

The 2558A AC Voltage Current Standard is more than sufficient to calibrate meters with a class 0.1 % accuracy.



























10 to 120 % of range
+/- (% of setting + % of range)
50/60 Hz 40 ≤ f ≤ 400 Hz 400 < f ≤ 1 kHz
AC Voltage 0.03 + 0.01* 0.05 + 0.01 0.10 + 0.02
AC Current 0.04 + 0.01* 0.06 + 0.01 0.12 + 0.02

* Add 0.1% of range when output is 120% to 144%.



























1 to 10% of range
+/- (% of range)
50/60 Hz 40 ≤ f ≤ 400 Hz 400 < f ≤ 1 kHz
AC Voltage 0.013 0.015 0.03
AC Current 0.014 0.016 0.032

High Stability


AC Voltage/Current: +/- 50 ppm/h

+/- (20 ppm of range + 30 ppm of range)/h

Perform measurements with high repeatability over time

Wide Output Range


AC Voltage: 1.00 mV to 1200.0 V
AC Current: 1.00 mA to 60.00 A

6 voltage ranges (100 m/1/10/100/300/1000 ([V]))
4 current ranges (100 m/1/10/50 ([A]))


The generation range is 0 to 144 % of range

Wide Frequency Range


40 to 1000 Hz (Frequency accuracy: +/- 50 ppm)

The 2558A provides fixed frequencies of 50/60 Hz (commercial) and 400 Hz (marine and aviation), as well as variable frequencies from 40 to 1000 Hz.

The high frequency accuracy of the 2558A (50 ppm) also enables it to be used to calibrate frequency meters.

Multiple 2558A units can be synchronized using the internal phase shifter. This means that two 2558As can be used as accurate sources of voltage and current for calibrating power meters.

Datasheet

2558A_FrontLeft_Small_2