Ametek mAcal
MilliAmp Calibrator

  • Sources and measures current. Calibration of transmitters in a two-wire loop
  • Stable source. Internal 24 VDC supply for consistent loop power
  • High resolution. Read to 0.001 mA in the measurement mode
  • % of full scale reading. Displays a percentage for easy analysis of results
  • Fast one-key-one-function access to the features
  • Large display with percentage display, and dedicated icons for calibrator status
  • Traceable calibration to a national standards lab such as NIST or NPL
  • Complete marine program.
  • Direct keyboard entry or cursor entry with decade control

Click here for larger image - Ametek mAcal Handheld Pressure CallibratorClick here for larger image - Ametek mAcal Handheld Pressure Callibrator
Ametek mAcal Shown

Product Information
Datasheet 1.1 MBpdf
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The JOFRA mAcal keypad is easy-to-use and provides positive tactile feedback to the user. Each key is labeled for easy operation. A large, high-contrast, 5-digit LCD display indicates numeric values in mA, %, V or sec. The resolution is 0.001 mA in measurement mode. The user can change the display to read in % of Full Scale and flow readings are shown in % of Flow.

The display also indicates error codes. Visual warnings are displayed for loop mismatch, reverse polarity and over range. Plus, the unit is equipped with a user adjustable automatic shut-off feature that prevents accidental battery discharge when the unit is not in use. A built-in, permanent fuse eliminates the need to replace the fuse in the case of overloads: no need to return the unit to the factory to reset or replace the fuse.

The mAcal Loop Calibrator provides loop power in the range of 0 to 45 VDC and the instrument is designed to generate a stable 24 VDC supply for the loop. The mAcal Loop Calibrator also reduces the time and complexity often associated with loop calibration. The instrument features special fixed steps for performing linear and flow transmitter or valve positioner calibrations. The instrument has seven different built-in current values and the user may choose between manual or automatic steps with 10 or 30 seconds between steps. You can perform an entire test by placing the mAcal in the process loop and take readings from the control room.
Ametek mAcal Specification
Current Source
Range 0 to 24 mA
Resolution 0.01 mA
Accuracy (k=2) ±0.05% of F.S.
Maximum load 900 ohm
Temperature coefficient 0.005% per °C (-10 to 40°C)
0.003% per °F (-14 to 104°F)
Current Measurement
Range 0 to 24 mA
Resolution 0.001 mA
Accuracy (k=2) ±0.05% of F.S.
Input impedance 10 ohm
Temperature coefficient 0.003% per °C (-10 to 40°C)
0.002% per °F (-14 to 104°F)
Voltage measurement
Range 0 to +45 VDC
Resolution 0.1 VDC
Accuracy 0.5 VDC
Input impedance 10M ohm
Power supply
120 VDC Mains Adapters: 103964, 6 VDC / 240 mA US/ Japan - 1.3mm DC female connector
Batteries 4 Type LR6, AA, 1.5 VDC Alkaline
Battery life 200 hours with external loop power
20 hours with 12 mA output/internal loop power
Instrument weight (incl. batteries, leads and case)
Weight 0.8 lbs /355g
Instrument dimensions (incl. batteries, leads and case)
Size: L x W x H 6.85 x 2.6 x 1.0 in / 174 x 66 x 26 mm
Operating (ambient) temperature -4 to 122°F (-20 to 50°C)
Storage (ambient) temperature 10% of accuracy spec/°C
CE Conformity 89/336/EEC, EN50081-1, EN50081-2,
EN50082-1. EN50082-2, (91/157/EEC)
Ordering Information
Model Description Buy Online Price
MACAL Ametek mAcal MilliAmp Calibrator Discontinued
Included Accessories
  • 2 -Test Leads with crocodile clip
  • 4 -Batteries, type LR6 AA
  • 1 -User manual