Current Calibrator & AC/DC Transconductance Amplifier

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

$19,800

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.)

Choose Your Level of Service

Our standard 1-year parts & labor warranty is included with every new instrument order and can be extended up to 3 years. For those seeking a higher service level with unlimited repairs, replacements, VIP turnaround, and free Z540.1 annual calibration, add a TrueCare Unlimited Support package to your order instrument tnow, so you’ll be fully protected from day one. You can find more information about the plan and how its different from the warranty by clicking here.

Choose Warranty Length

12-months of complimentary instrument warranty are cincluded with each instrument purchase. Please specify your warranty length below. Note: You cannot extend your warranty after its original term has expired.

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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

 

Instrument Accessories

Maximize Your Instrument’s Performance with Certified-Compatible Cables, Leads, Connectors, & More

We recommend the accessories below for your instrument.  Each has been specifically designed and configured for top performance with our precision instruments.

Documents & Downloads

Here you can download the documentation relevant to your instrument. This section will be continually updated as more media is added (tutorials, demos, etc).

Manual and Specifications

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.

Quick Contact

Use this form to quickly configure and request a formal quote from our sales department. You may always reach us at 800-548-9806 if you'd like immediate assistance.
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