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.

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

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
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.

Calibration & Meter Testing

The 2558A provides specific functions to enable meters to be calibrated accurately and efficiently.

Using the output divider and deviation

Calibrating two or more points is quick and simple. It is only necessary to preselect the number of required calibration points with the lower divider control and then use the upper control to step the output to the next calibration point. The deviation settings will then enable the output value and error of each calibration point to be displatyed directly.

Front

The deviation preset control can be used to move the output value in small increments (2 or 5 % of the step between calibration points).

This means that it is possible to finely approach the target calibration point, either from a lower value or a higher one, without exceeding it. This is particularly useful when the friction (hysteresis) of the moving part needs to be taken into consideration. In this case, the point is calibrated twice, once from a lower value and once more from a higher value and the final calibration result is the average of the two.

Guage

Using sweep

Needle sticking tests can be performed with high repeatability. It is possible to stop at any point and sweep around it in fine detail.

Sweep

Power Calibration

A power calibration system can be created by using two 2558As (one each for AC voltage and AC current) together with a Yokogawa WT3000 power analyzer as the reference.

One of the 2558As acts as the master unit and provides the synchronizing oscillator signal. The required power factors is set by adjusting the phase shifter on the slave unit and monitoring the result on the WT3000. A 3 phase power calibrator system can be simply built by adding further 2558As.

Synchronizing

Higher Current Output

To generate higher current than 72 A, two 2558As can be connected to double the output to 144 A.

Condition:

  • Accuracy, stability, temperature coefficient is the sum of the individual units.
  • 50/60 Hz only.

 

High Current

Use Existing 2558 Programs

The 2558A is backwardly compatible with the previous 2558 Model. The new 2558A supports a 2558 command mode, which means that you can switch from the 2558 to the 2558A without modifying your program. It is also possible to mix 2558s and new 2558As in the same system.

I Ok

Comparison with the 2558

 

    2558A
2558
AC Voltage
Output range of the specified accuracy
1.00 mV to 1200.0 V
1.00 mV to 1200.0 V
Accuracy (50/60 Hz)
+/- 400 ppm
+/- 950 ppm
Frequency of the specified accuracy
40 to 1000 Hz
50 /60 /400 Hz
AC Current
Output range of the specified accuracy
1.00 mA to 60.00 A
1.00 mA to 60.00 A
Accuracy (50/60 Hz)
+/- 500 ppm
+/- 950 ppm
Frequency of the specified accuracy
40 to 1000 Hz
50 /60 /400 Hz
Frequency
Output range
40 to 1000 Hz
40 to 500 Hz
Accuracy
+/- 50 ppm
+/- 1%
Max. Output
Approx. 36 VA (60 A/0.6 V)
Approx. 36 VA (60 A/0.6 V)
Stability
+/- (20 ppm of setting + 30 ppm of range)/h
+/- (0.03% of range)/h
Dimensions (mm)
426 (W) x 132 (H) x 400 (D)
439 (W) x 149 (H) x 415 (D)

 

Front of Unit Specifications

Front Of Unit Corrected

Back of Unit Specifications

 Rear Panel 2

Output

Range
Output Range
Specified Output Range*
Resolution
Maximum Output
100 mV
0 to 144.00 mV
1 to 120.00 mV
10 uV
---
1 V
0 to 144.00 mV
0.01 to 1.2000 V
100 uV

0.5 A or more

10 V
0 to 14.400 V
0.1 to 12.000 V
1 mV
Approx. 3 A
100 V
0 to 144.00 V
1 to 120.00 V
10 mV
Approx. 0.3 A
300 V
0 to 432.0 V
3 to 360.0 V
100 mV
Approx. 0.1 A
1000 V
0 to 1440.0 V
10 to 1200.0 V
100 mV
Approx. 6 mA
100 mA
0 to 144.00 mA
1 to 120.00 mA
10 uA
Approx. 15 V
1 A
0 to 1.4400 A
0.01 to 1.2000 A
100 uA
Approx. 15 V
10 A
0 to 14.400 A
0.1 to 12.000 A
1 mA
Approx. 3 V
50 A
0 to 72.00 A
0.5 to 60.00 A
10 mA
Approx. 0.6 V

* 1% to 144% of range when frequency is 50 or 60 Hz.

Accuracy

 

Upper: 180 Days

Lower: 1 Year

 
10 % to 120% of range
1% to 10% of range
 
+/- (% of setting + % of range)

+/- (% of range)

Range
50/60 Hz
40 Hz ≤ f ≤ 400 Hz
400 Hz
50/60 Hz
40 Hz ≤ f ≤ 400 Hz
400 Hz
100 mV

0.03 + 0.01*

0.04 + 0.01*

0.05 + 0.01

0.06 + 0.01

0.10 + 0.02

0.11 + 0.02

0.013

  0.014

0.015

0.016

0.030

0.031

1 V
10 V
100 V
300 V
1000 V
100 mA

0.04 + 0.01*

0.055 + 0.01*

0.06 + 0.01

0.075 + 0.01

0.12 + 0.02

0.135 + 0.02

0.014

0.0155

0.016

0.0175

0.032

0.0335

1 A
10 A
50 A

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

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

701902/701903 Safety BNC to BNC Cable 1m/2m

701902: 1000 Vtms-CAT II (BNC-BNC), 1 m
701903: 1000 Vrms-CAT II (BNC-BNC), 2 m

758917 DMM Measurement Lead Set

A set of 0.8m long red and black test leads, used in combination with a pair of optional 758922 or 758929 alligator-clip adapters.

758921 Fork terminal adapter

Adapters for fitting a 4mm banana plug to a fork terminal. Set contains 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

Rated at 1000V. Attaches to the 758917 test leads. Sold in pairs.

758931 Screw-Fastened Safety Voltage Terminal Adapter Set

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

Measurement lead 758933

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

B8506WA Measurement Lead Set

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

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