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

$19,995

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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Capable of delivering from 1mA to 100 amps DC or RMS AC of precise constant current, the 2555A is ideal for direct calibration of ammeters, wattmeters, DMM’s, shunts, current transformers and Hall effect devices. The superb stability of Valhalla’s patented transconductance amplifier technology allows the 2555A to be used for transfer measurements on .001 Ω primary resistance standards. Applications for the 2555A outside of the field of metrology include component testing on fuses, circuit breakers, relays and high current connectors.

Constant current

The 2555A supplies four volts of compliance in order to drive heavy burden loads and still delivers constant current. The output compliance is continually monitored by the unit’s internal voltmeter. Compliance status is displayed at all times on the 2555A’s compliance indicators.

To ensure that the compliance voltage is available to drive the load (and not the leads), Valhalla offers two heavy duty six foot 100 amp cable sets. The “HMF” set is terminated in 2″ opening, 500 amp rated, injection molded clamps, while the “HC” version is terminated in no. 4 copper ring lugs.

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Simulate 1000 Amps

Valhalla offers the option “C1000” along with the Valhalla 2555A, to 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 envolves the 2555A driving 100 amps per turn into a 10 turn coil. The Valhalla 2555A Current Calibrator can easily drive the ten turn option “C1000” and simulate 1000 amps. By placing the clamp-on ammeter around and thru the windings of the “C1000” the clamp-on meter under test can be verified for accuracy, and frequency response.

The Valhalla 2555A is the “workhorse” in the metrology lab for the calibration of current shunts, ammeters, clamp-on meters, current transformers, and even low value resistance standards. The metrology lab isn’t the only place a Valhalla 2555A comes in useful. Production departments and Quality Control test areas using the Valhalla 2555A can also benefit. Many companies improve their product reliability by using the 2555A for the screening of fuses, relays, circuit breakers, and a multitude of current sensor incorporated devices.

General Specifications

  • Input Impedance:
    • 100kΩ
  • Compliance Voltage
    • 7VDC or 7Vac (RMS) to 60A
    • 4VDC or 4Vac (RMS) to 100A
  • Input/Output Ratio
    • 00000V input provides full-scale output
    • (1.0000V input produces 100.00A output)
  • Stability
    • +0.0005% -15min. (±0.005% for 24Hr)
  • Load Regulation
    • Output current level changes less than ±0.002%
  • Maximum Input:
    • 3VDC or 2Vac (RMS)
  • Maximum Isolation Voltage
    • ±200VDC or peak AC
  • Response Time
    • 1msec to ±0.01% of final value following input amplitude or frequency change
  • Input CMR
    • 60dB @ DC linearity decreasing to 40dB @ max frequency
  • Temperature Coefficient
    • ±0.001% of output ±0.002% of rng/double for AC

Power

  • Power Requirements
    • 115VAC/230VAC ±10% at 50 to 60Hz

Temperature

  • Operating Temp. Range:
    • 0°C to 50°C
  • Storage Temp. Range:
    • -30°C to 70°C
  • Humidity
    • 70% RH max @ 40°C (non-condensing)

Physical Specifications

  • Size
    • 266mm/10.5” L x 432mm/17” W x 584mm/23” D
  • Weight:
    • 100lbs / 45kg net;
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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Manual and Specifications

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What’s Included

All instrument orders include the following:

13-Month Comprehensive Instrument Warranty

All pre-paid orders include 13-month instrument warranty that covers component and labor costs in the event of needed repair or recalibration.

Certificate of Calibration

A fully-documented NIST-traceable Z540 certificate of calibration is included with your instrument.

Unlimited Phone & Email Support

Our engineering, sales, and customer support teams are always available to answer questions, walk you through particular product features, and assist with any issue that may arise.

Required Power Supply/Battery Pack

Unless you select a different option, every instrument ships with the cables and power supplies required to operate.

All Instrument Documentation

Includes user manual, calibration procedures, specifications, and any relevant materials.

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