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Yellow rectangular handheld calibrator with digital display and test lead ports

MASTECH

MASTECH MS7221 Volt/mA Calibrator 0-10V 0-24mA

SKU CH-9EJV-B76ND

Sources and measures 0-10 V DC and 0-24 mA loops with 0.015 % accuracy and 1 µA resolution

  • TypeDigital Multimeters
  • Measures loop current to 0.015% accuracy with 1uA resolution
  • Sources and simulates DC current up to 24 mA for loop testing
  • Sources DC voltage to 100 mV or 10V with 0.02% precision
  • Built-in 24V loop supply powers transmitters while measuring current
  • High-count 88888 display shows fine detail for calibration work

Purpose and user

The MASTECH MS7221 is a portable calibrator for technicians who source and measure DC voltage up to 10 V and current loops up to 24 mA. It suits process-plant commissioning, PLC loop verification and transmitter bench checks where a single handheld tool must both simulate and read signals.

Capacity and headroom

The instrument sources or measures 0–100 mV and 0–10 V with ±0.02 % accuracy and handles 0–24 mA loops at ±0.015 % with 1 µA resolution. A built-in 24 V loop supply powers transmitters while current is measured, but the unit cannot source and measure at the same time.

Thermals, noise and power

Battery-powered from a 9 V 6F22 cell, the calibrator runs cool and silent during typical loop tests. The 88888-count display remains readable without backlight, and the compact 19 × 9.0 × 4.3 cm enclosure adds no fan noise or noticeable heat in normal use.

Highlights

  • Measures loop current to 0.015% accuracy with 1uA resolution
  • Sources and simulates DC current up to 24 mA for loop testing
  • Sources DC voltage to 100 mV or 10V with 0.02% precision
  • Built-in 24V loop supply powers transmitters while measuring current
  • High-count 88888 display shows fine detail for calibration work

Specifications

TypeDigital Multimeters

Questions about this item

Can the MS7221 0-10 V source work with my existing 0-10 V PLC inputs?

The calibrator sources 0-100 mV and 0-10 V DC with ±0.02 % accuracy, matching standard 0-10 V process signal ranges used by many PLC analogue inputs.

How do I verify the MS7221 is measuring loop current correctly after connecting it?

The 88888-count display shows loop current with 1 µA resolution and ±0.015 % accuracy; compare the reading against a known reference transmitter to confirm operation.

What accessories come with the MS7221 and what must I supply myself?

The box includes the meter, two test leads, a carrying case and a user manual; you must provide a 9 V 6F22 (1604) battery for power.

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