2575A Precision AC/DC Active Current Shunt


A versatile, powerful calibration tool, the 2575A Precision AC-DC Active Current Shunt measures both AC/DC current and works as a standard for low-level resistance calibration requirements. 

  • Precision AC-DC Active Current Shunt
  • AC & DC Current Measurement to 100 Amps
  • Built-In Chopper Stabilizer Amplifier
  • Measurement tool for AC and DC
  • Working Calibration Standard
  • Calibration Traceable to NIST
  • Six Independent Switch Selectable Current Ranges
  • Fan-cooled Shunts for Thermal stability
  • Low Resistance Lab Standard Resistance Bank

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.

2575A Recommended Peripherals *

100 Amp Cable Set (Spade Lugs)

Dual Banana to Dual Banana Lead Set

19” Rack Mount Adaptor

17025 Certification

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A versatile, powerful calibration instrument.

The 2575A Precision AC-DC Active Current Shunt measures both AC/DC current and works as a standard for low-level resistance calibration requirements.

What’s New?

  • Built-in precision gain 10  chopper stabilizer buffer amplifier.

What’s Wrong With Using DC Resistors to Certify AC Current?

Plenty! To start with most lab standard resistors are designed to permit close trimming to a nominal DC value. These DC resistors contain inductive components, which even though very small, can result in significant AC voltage error (especially in the lower resistance values). To this end, each range of the 2575A utilizes a specially designed non-inductive resistance element which insures a flat frequency response to 10KHz.

AC & DC Current Measurement to 100 Amps

In the current measurement mode, the 2575A offers six independent switch selectable ranges from 1 milliamp full scale to 100 amperes. All but the maximum range feature 100% overrange capability. The 100A, 10A and 1A range shunt resistors are fan cooled to insure minimum heat rise and thereby maximize thermal stability (<0.001% per°C).

Four-Terminal Performance You Can Bank On

When used as a lab standard resistance bank, the 2575A provides six decade values of 4-terminal resistors from .001 ohm to 100 ohms all ranges independentlhy calibratable. is independently adjustable.

Built-In Chopper Stabilizer Amplifier

The full scale voltage drop across the shunt is 100.00 millivolts at rated current. A precision gain of 10.000 wide-band chopper amplifier is incorporated to provide a higher level output, capable of driving thermal transfer standards. The amplifier is available for use with external inputs and features an input impedance of 10,000 megohms.

Key Specifications

Range Name & Maximum Input
Shunt Value
DC Accuracy (% of Range)
AC Accuracy (% of Range)
Frequency Response
100A 0.001Ω ±0.05% ±0.1% DC to 1kHz
20A 0.01Ω ±0.02% ±0.1% [1] DC to 10kHz
2A 0.1Ω ±0.02% ±0.1% DC to 10kHz
200mA ±0.01% ±0.1% DC to 10kHz
20mA 10Ω ±0.01% ±0.1% DC to 10kHz
2mA 100Ω ±0.01% ±0.1% DC to 10kHz
NOTES: [1] AC accuracy is ±0.5% of range above 1kHz

Amplifier Characteristics:

  • Amplitude Gain: 10.000
  • Gain Accuracy: ± 0.01% 10µV RTI @ DC
  • Frequency Response: ± 0.1% to 10 Khz
  • Input Resistance: Greater than 1010Ω
  • Output Resistance: Less than 0.1Ω
  • Temperature Range: 0 to 50°C
  • Temperature Coefficient: Less than .001% per °C
  • Voltage Drop (before amplifier): 100.00 mV for full scale input current
  • Power: 115/230 VAC 50-60 Hz 12 Watts
  • Size: 3.5″H x 17″W x 10″D (8.9cm x 43.2cm x 25cm)
  • Weight: 8 lbs. (3.6KG) Net 13 lbs. (5.9 KG) Shipping


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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