2555A 100-Amp Current Calibrator and AC/DC Transconductance Amplifier

$17,995

World’s Leading Precision 100-Amp AC/DC Current Standard – For 30 years Valhalla Scientific’s design has proven rock-solid reliability in metrology labs worldwide.  The 2555A is a calibration powerhouse with wide-ranging applications and unsurpassed quality.

  • Up to 20 Amps/phase direct (self contained shunt 0.1%)
  • Precision AC/DC Transconductance Amplifier
  • Programmable AC~DC 100Amp Current Calibrator/Current Source
  • Calibration Traceable to NIST
  • Maximum Output Current: 100A DC or RMS AC
  • Highly Accurate
  • Ultra-low Noise
  • Ultra-Stable
  • Excellent Response time
  • High CMR
  • Load Regulation: Output current Δ < ± .002%
  • Dynamic Range: 0 to 100% of range up to maximum rated output (100A max.)
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The 2555A is the world’s leading AC-DC current calibrator for one big reason. It’s earned that position through years of rock-solid reliability and unmatched performance. Our satisfied and discriminating customers include the U.S. Army, Navy, Air Force and the National Institute of Standards and Technology, as well as an impressive list of hundreds of other proud 2555A owners around the world.

Valhalla’s proprietary internal shunt design with low TC (2ppm/°C) is just one of the technologies which provide the 2555A with rock-solid constant AC or DC current. Supplies 400 watts (i.e. 7 volts at 55 amps) in output compliance capability to drive heavy burden loads and still delivers constant current. The output compliance is monitored by the unit’s internal voltmeter. Compliance voltage status is displayed with a green L.E.D. indicator for “OK” or within compliance, a yellow L.E.D for marginal” compliance, and a red L.E.D. for compliance exceeded” indication.

To ensure that compliance voltage is available to the load (and not just the leads). The C1000 along with the 2555A, make the calibration of clamp-on ammeters, current transformers, and a variety of current sensor (magnetic field based) devices a simple task. The basic principle involves the 2555A driving 100 amps per turn into a 10 turn coil. The 2555A can easily drive the ten turn option “C1000” and simulate 1000 amps.

Range Specifications

Range
DC Accuracy
AC Accuracy
100Hz
400Hz
1000Hz
100A ± 0.03% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
20A ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
2A ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
200mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
20mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
2mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output

 

Input Impedance: 100kΩ Input CMR 60dB @ DC linearity decreasing to 40dB @ max frequency
Compliance Voltage 7VDC or 7Vac (RMS) to 60A

4VDC or 4Vac (RMS) to 100A

Temperature Coefficient ±0.001% of output ±0.002% of rng/double for AC
Input/Output Ratio 00000V input provides full-scale output

(1.0000V input produces 100.00A output)

Power Requirements 115VAC/230VAC ±10% at 50 to 60Hz
Stability +0.0005% -15min. (±0.005% for 24Hr) Operating Temp. Range: 0°C to 50°C
Load Regulation Output current level changes less than ±0.002% Storage Temp. Range: -30°C to 70°C
Maximum Input: 3VDC or 2Vac (RMS) Humidity 70% RH max @ 40°C (non-condensing)
Maximum Isolation Voltage ±200VDC or peak AC Size 266mm/10.5” L x 432mm/17” W x 584mm/23” D
Weight: 100lbs / 45kg net;

 

 

Input Impedance: 100kΩ Input CMR 60dB @ DC linearity decreasing to 40dB @ max frequency
Compliance Voltage 7VDC or 7Vac (RMS) to 60A

4VDC or 4Vac (RMS) to 100A

Temperature Coefficient ±0.001% of output ±0.002% of rng/double for AC
Input/Output Ratio 00000V input provides full-scale output

(1.0000V input produces 100.00A output)

Power Requirements 115VAC/230VAC ±10% at 50 to 60Hz
Stability +0.0005% -15min. (±0.005% for 24Hr) Operating Temp. Range: 0°C to 50°C
Load Regulation Output current level changes less than ±0.002% Storage Temp. Range: -30°C to 70°C
Maximum Input: 3VDC or 2Vac (RMS) Humidity 70% RH max @ 40°C (non-condensing)
Maximum Isolation Voltage ±200VDC or peak AC Size 266mm/10.5” L x 432mm/17” W x 584mm/23” D
Weight: 100lbs / 45kg net;

 

Range Specifications

Range
DC Accuracy
AC Accuracy
100Hz
400Hz
1000Hz
100A ± 0.03% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
20A ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
2A ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
200mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
20mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output
2mA ± 0.015% of range ± 0.03% of output ± 0.15% of range ± 0.1% of output ± 0.2% of range ± 0.2% of output ± 0.3% of range ± 0.3% of output

 

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