signal
»
Sources and measures current
Allows for calibration of transmitters in a twowire 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 to provide for easy
analysis of results
milliAmp Calibrator
mAcal
»
Timesaving features
Fast one-key-one-function access to the
features such as the step function or loop
supply power
»
Large display
Includes large numbers for unit reading, a
percentage display, and dedicated icons for
calibrator status including a low battery
indicator
»
Traceable calibration
For your confidence, the unit is supplied with
a calibration certificate that is fully traceable
to a national standards lab such as NIST or
NPL
»
Complete marine program
Part of a complete program of marine
approved temperature, pressure and signal
calibrators; including temperature sensors
ISO 9001 Manufacturer
The mAcal milliAmp Calibrator is an economical and easy-to-use calibration device for sourcing and measuring mA signals.
The instrument is designed specifically for 2-wire transmitter loops with 4
to 20 mA signals and it is delivered with traceable certification.
The keypad is easy-to-use and provides positive tactile feedback. 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. And is also 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 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 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.
Specification Sheet, SS-MACAL
PWR
Switch between external and
internal loop power supply EXT.
(the +24 VDC of the current
loop is generated by an external
power supply) and INT. (the +24
VDC of the current loop is generated by the mAcal itself).
Mains adapter
Connection to mains adapter.
6 VDC, 230 mA.
Note : The mains adapter does
not charge rechargeable batteries.
ON/OFF
Switching instrument on/off.
Auto shut-off to extend battery
life (user programmable).
mA/% / setup
Alternating between readout in
mA and %. If the key is held
down for more than 2 sec., a
change to SETUP takes place.
Under SETUP this key is used
to select next parameter.
Connection
Connection of +
test lead
Connection
Connection of - test
lead
Display
Shows numerical value in
mA, %, V or sec., and for
readout of error codes etc.
FUNC
This key allows for changing
functions between SOURCE
mA, MEASURE mA and
MEASURE Volt function.
Step
The STEP function is activated or de-activated.
Up arrow
Functions to increase
entered values or to scroll
up.
Auto
AUTO ramp or AUTO-STEP
function is started or stopped.
Down arrow
Functions to decrease
entered values or to scroll
down.
JOFRA mAcal in softcase
The mAcal calibrator is available separately and are supplied in a handy softcase that
allows for complete operation of the unit while in the case. The convenient internal
arrangement offers you the space to store test leads.
2 www.jofra.com milliAmp Calibrator • mAcal
FUNCTIONAL SPECIFICATIONS
PHYSICAL SPECIFICATIONS
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
Adjusting the instrument
Connect the mAcal to an external reference instrument as shown in Fig. 1.
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
Miscellaneous
Operating (ambient) temperature -14 to 104°F (-10 to 40°C)
Storage (ambient) temperature .....-4 to 122°F (-20 to 50°C)
CE Conformity ..........89/336/EEC, EN50081-1, EN50081-2,
.................................EN50082-1. EN50082-2, (91/157/EEC)
The JOFRA mAcal is type approved by Det Norske Veritas.
Find the certificate at www.jofra.com
Approval, Certificate no. .........................................A-10549
Fig. 1
The mAcal now carries out a self-calibration and adapts its circuits to that measured.
Switch on the mAcal. It is now adjusted and ready for use.
Note: The mAcal can only be adjusted in mA. Adjustment of the VDC function is not
possible.
Calibrating the instrument (measure mA)
Connect the mAcal to an external reference instrument and a current source as shown
in Fig. 2.
Calibration is carried out in the following points: 0 mA, 4 mA, 8 mA, 12 mA, 16 mA, 20
mA and 24 mA. If the mAcal displays EEEEE when measuring the 24 mA, you must
turn down the current until the EEEEE disappears.
Calibration must subsequently be carried out at a lower value (e.g. 23.995 mA).
The deviation between the read value of the mAcal and the read value of the reference
instrument must be 8 μA at a maximum.
Fig. 2
Calibrating the instrument (source mA)
Connect the mAcal to an external reference instrument as shown in Fig. 3.
Fig. 3
Calibration is carried out in the following points: 0 mA, 4 mA, 8 mA, 12 mA, 16 mA, 20
mA and 24 mA. The deviation between the adjusted value of the mAcal and the read
value of the reference instrument must be 8 μA at a maximum.
www.jofra.com 3mAcal • milliAmp Calibrator
ORDERING INFORMATION
75-MACAL mAcal Calibrator with standard accesories
STANDARD DELIVERY
• mAcal Calibrator:
• mAcal
• Soft carrying case
• 2 test leads with crocodile clip
• 4 batteries, type LR6, AA
• User manual
ACCESSORIES
103964 Mains adapter for mAcal - US / Japan
103950 Mains adapter for mAcal - Europe
103957 Mains adapter for mAcal - UK
124716 4x 1,5 Volt rechargeable batteries
124718 Charger for rechargeable batteries - 115/230 VAC
A business unit of AMETEK Measurement & Calibration
AMETEK Test & Calibration Instruments
Technologies Division offering the following industry
leading brands for test and calibration instrumentation.
JOFRA Calibration Instruments
Temperature Calibrators
Portable dry-block calibrators, precision thermometers
and liquid baths. Temperature ranges from
-90°C(-130°F) to 1205°C(2200°F). Temperature sensors
for industrial and marine use.
Pressure Calibrators
Convenient electronic systems ranging from -25 mbar to
1000 bar - fully temperature -compensated for problem-
free and accurate field use.
Signal Instruments
Process signal measurement and simulation for easy
control loop calibration and measurement tasks.
M&G Pressure Testers & Pumps
Pneumatic floating-ball or hydraulic piston dead weight
testers with accuracies to 0.015% of reading. Pressure
generators delivering up to 1,000 bar.
Lloyd Instruments
Materials testing machines and sof tware from Lloyd
Instruments guarantees exper t materials testing
solutions. The comprehensive program also covers
Texture Analysers to perform rapid, general food testing
and detailed texture analysis on a diverse range of foods
and cosmetics.
Davenport Polymer Test Equipment
Allows measurement and characterization of moisture-
sensitive PET polymers and polymer density.
Chatillon Force Measurement
The hand held force gauges and motorized testers
have earned their reputation for quality, reliability and
accuracy and they represent the de facto standard for
force measurement.
Newage Testing Instruments
Hardness testers, durometers, optical systems and
software for data acquisition and analysis.
AMETEK Denmark A/S
Gydevang 32-34 | 3450 Allerød | Denmark
T: +45 4816 8000 | ametek@ametek.dk
Information in this document is subject to change without notice. ©2012, by AMETEK, Inc., www.ametek.com. All rights reserved.
4 www.jofra.com
www.jofra.com
AMETEK Mansfield & Green (North America)
T: +1 800 527 9999 | cal.info@ametek.com
AMETEK Singapore Pte. Ltd. (Singapore)
T: +65 6 484 2388 | aspl@ametek.com.sg
AMETEK Inc. Beijing Rep. Office (China)
T: +86 10 8526 2111 | jofra@ametek.com.cn
AMETEK Instruments India Pvt Ltd. (India)
T: +91 22 2836 4750 | ametek@ametek.dk
AMETEK GmbH (Germany)
T: +49 2159 9136 510 | info.mct-de@ametek.de
AMETEK Calibration Instruments (UK)
T: +44 (0) 1243 833 302 | jofra@ametek.co.uk
Pub code SS-MACAL Issue 1201
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