Ametek mAcal User Manual
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Ametek mAcal User Manual

Ametek mAcal User Manual

Ma loop calibrator
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User Manual
mAcal
mA loop Calibrator
 Copyright 2005 AMETEK DENMARK A/S

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Summary of Contents for Ametek mAcal

  • Page 1 User Manual mAcal mA loop Calibrator  Copyright 2005 AMETEK DENMARK A/S...

  • Page 2: Table Of Contents

    ERROR SITUATIONS ............10 4.1 TEST FOR “OPEN LOOP”............10 4.2 TEST FOR INCORRECT POLARITY ........... 10 4.3 TEST FOR “OVERRANGE” ............10 4.4 INDICATION OF BATTERY STATUS .......... 11 HOW mAcal IS ADJUSTED (service mode) ....12 TECHNICAL SPECIFICATIONS (23°C±3°C)....14 103887 01...

  • Page 3: Introduction

    INTRODUCTION The mAcal is a loop calibrator for measuring and generating mA. The mAcal is specially designed for use in industrial plants with 4-20mA signals. The mAcal can be operated with one hand, and operation is simple and intuitive. PACKING LIST When the instrument is received, the box should contain the following: ...
  • Page 4  Do not use the calibrator if it is damaged. Before you use the calibrator, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.  Select the proper function and range for your measurement. ...

  • Page 5: Operation

    +24VDC of the current loop is generated by an external power supply) and INT. (the +24VDC of the current loop is generated by the mAcal itself). The various segments of the display indicate the following (cf. Fig. 1 on the cover of the user’s guide):...
  • Page 6 ITEM DISPLAY SEGMENT Description: When this segment is lit, the voltage in the batteries LOW BAT (LOW is less than 3.5 V, and they should be replaced. BATTERY) When the segment flashes, the voltage is less than 3.1 V and the instrument cannot be operated. 0-20 0-20mA is selected as the range, which affects the readout in %, as well as STEP values.

  • Page 7: Switching The M Acal On/Off

    MEASURE mA or MEASURE Volt) which was active when it was last switched off. HOW THE CURRENT IS GENERATED Connect the mAcal to the instrument to be tested as shown in Fig. 3 or Fig. 4 on the cover of the user’s guide and switch the unit on.

  • Page 8: How The Current Is Measured

    The mAcal now generates the current shown in the display. HOW THE CURRENT IS MEASURED Connect the mAcal to the transmitter to be tested as shown in Fig. 5 or Fig. 6 on the cover of the user’s guide and switch the unit on.

  • Page 9: How New Parameters Are Selected (Setup)

    The mAcal now measures the voltage shown in the display. HOW NEW PARAMETERS ARE SELECTED (SETUP)  Press for approx. 2 seconds. The present selection of MODE is now shown in the display, e.g.  Press to cancel a selection. SETUP is exited and it is necessary to start all over again.

  • Page 10: Selection Of Step Size

    Press display.  Press and AUTOMATIC OFF is deselected. appears in the display.  Press to save the present selection. SETUP is exited and the mAcal is now ready for normal operation with new parameters. 103887 01...

  • Page 11: Error Situations

    ERROR SITUATIONS TEST FOR “OPEN LOOP” The text flashes in the display: CAUSE The unit is unable to generate the desired current. The current loop is probably open or selection of PWR is incorrect.  Check whether instrument is connected correctly. REMEDY ...

  • Page 12: Indication Of Battery Status

    INDICATION OF BATTERY STATUS  The text “LOW BAT” lights up in the display:  The text “LOW BAT” flashes in the display: CAUSE “LOW BAT” lights up: The batteries are about to be used up. However, the instrument can still be used. “LOW BAT”...

  • Page 13: How Macal Is Adjusted (Service Mode)

    HOW mAcal IS ADJUSTED (service mode) Connect the mAcal to an external precision instrument (with an accuracy higher than 0.02% of F.S.) as shown in Fig. 3 on the cover of the user’s guide.  Hold down and press 3 images appear in the display: ...
  • Page 14  Press to approve the value. 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. 103887 01...

  • Page 15: Technical Specifications (23°C±3°C)

    TECHNICAL SPECIFICATIONS (23°C±3°C) Current generation Range 0-24mA Resolution 0.01mA Accuracy (k=2) 0.05% F.S. Max. load 900 Ohm Current measurement Range 0-24mA Resolution 0.001mA Accuracy (k=2) 0.05% F.S. Input impedance 10 Ohm Voltage measurement Range OV to +45V Resolution 0.1V Accuracy 0.5V Operation temperature -10°C to +40°C...

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