The Tektronix A621 and A622 are clamp-on current probes in the A600 Series, designed to support current measurements with the TekMeter or an oscilloscope. The A621 is an industrial-style clamp-on probe with a BNC connector that measures AC current. The A622 is a 'long nose' style clamp-on probe that uses a Hall Effect current sensor to provide a voltage output to oscilloscopes, and it measures both AC and DC current. Both probes terminate in a BNC connector and can be used with a shrouded banana plug adapter, so they work with digital multimeters, the TekMeter, and oscilloscopes.

A clamp-on current probe lets an engineer measure the current flowing through a conductor without breaking the circuit, sensing the conductor's magnetic field and converting it to a proportional voltage output. The A600 Series probes are designed for measurements on motor drives, inverters, power supplies, and avionics.

ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every used unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer.

Brand Heritage

Tektronix, founded in 1946, was acquired by Danaher Corporation in 2007. In 2016 Danaher spun off its test and measurement portfolio into Fortive Corporation, of which Tektronix is now a part.

Compare Other Models in This Series

The A600 Series consists of two clamp-on current probes, the A621 and the A622, both designed to support current measurements with the TekMeter or an oscilloscope. The two models share a common clamp-on form factor and BNC termination but differ in coupling, current range, frequency range, and the maximum conductor diameter they accept.

The A621 is the industrial-style AC probe built for high-current measurement, while the A622 is a 'long nose' AC/DC probe that uses a Hall Effect sensor. Selecting between them comes down to whether DC content must be measured and the magnitude of the current involved.

Each pre-owned model below is listed on its own dedicated product page with condition-matched pricing. Select the model that matches your measurement requirements, then choose the configuration that fits your budget.

The clearest difference between the two models is coupling and range: the A621 measures AC current from 100 mA to 2000 A peak across 5 Hz to 50 kHz, whereas the A622 measures both AC and DC current from 50 mA to 100 A peak across DC to 100 kHz. The A622's Hall Effect current sensor is what enables its DC measurement capability.

The probes also differ physically. The A621 accepts conductors up to 54 mm (2.13 in.) in diameter and offers 1, 10, or 100 mV/A output scaling, while the A622 accepts conductors up to 11.8 mm (0.46 in.) and offers 10 or 100 mV/A scaling. Both share the same 600 V (CAT III) bare-wire voltage rating. See the comparison table below for a side-by-side summary.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

Important: For instruments with banana-jack inputs, the Tektronix 012-1450-00 Female BNC-to-banana lead adapter is required.

Recommended pairing: use these probes with Tektronix TPS2000, TDS1000B, TDS2000C, or TDS3000C Series oscilloscopes and DMM4020, DMM4040, or DMM4050 digital multimeters.

About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

• Warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.