Ametek MAcal Manuale utente

User Manual

mAcal

mA loop Calibrator

103887 01 1

LIST OF CONTENTS

1. INTRODUCTION

1.1 PACKING LIST ...............................................................................2

2. SAFETY INSTRUCTIONS....................................................2

3. OPERATION ........................................................................4

3.1 DISPLAY AND KEYBOARD...........................................................4

3.2 SWITCHING THE MACAL ON/OFF .................................................6

3.3 HOW THE CURRENT IS GENERATED.........................................6

3.4 HOW THE CURRENT IS MEASURED...........................................7

3.5 HOW THE VOLTAGE IS MEASURED...........................................7

3.6 HOW NEW PARAMETERS ARE SELECTED (SETUP)...............8

3.6.1 SELECTION OF MODE...........................................................8

3.6.2 SELECTION OF SLOPE TIME................................................8

3.6.3 SELECTION OF STEP SIZE...................................................9

3.6.4 SELECTION OF STEP TIME ..................................................9

3.6.5 SELECTION OR DE-SELECTION OF AUTOMATIC OFF FUNCTION 9

4. 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

5. HOW mAcal IS ADJUSTED (service mode) ....................12

6. TECHNICAL SPECIFICATIONS (23°C±3°C)....................14

2 103887 01

1. 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.

1.1 PACKING LIST

When the instrument is received, the box should contain the following:

 mAcal

 Bag

 2 test leads with crocodile clip

 4 batteries, type LR6, AA

 This user’s guide

2. SAFETY INSTRUCTIONS

Read this manual carefully before using the instrument!

In order to avoid any personal injuries and/or damage to the instrument

all safety instructions and warnings must be observed.

Disposal – WEEE Directive

These calibrators contain Electrical and Electronic circuits and must be

recycled or disposed of properly (in accordance with the WEEE

Directive 2002/96/EC).

WARNING:

 The calibrator must not be used for any purposes other than those

described in this manual.

 Follow all equipment safety procedures.

 The calibrator has been designed for interior use only and should

not be used in hazardous areas, where vapour or gas leaks, etc.

may constitute a danger of explosion.

 Do not apply more than the rated voltage. See specifications for

supported ranges.

103887 01 3

 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.

 Make sure the battery cover is closed and latched before you

operate the calibrator.

 Remove test leads from the calibrator before you open the battery

door.

 Inspect the test leads for damaged insulation or exposed metal.

Check test leads continuity. Replace damaged test leads before

you use the calibrator.

 When using the probes, keep your fingers away from the probe

contacts. Keep your fingers behind the finger guards on the probes.

 Do not use the calibrator if it operates abnormally. Protection may

be impaired. When in doubt, have the calibrator serviced.

 Disconnect test leads before changing to another measure or

source function.

 To avoid false readings, which could lead to possible electric shock

or personal injury, replace the battery as soon as the battery

indicator appears.

 To avoid personal injury or damage to the calibrator, use only the

specified replacement parts and do not allow water into the case.

Caution…

 Disconnect the power and discharge all high-voltage capacitors

before testing resistance or continuity.

 Use the proper jacks, function and range for your measurement or

sourcing application.

 To avoid damaging the plastic lens and case, do not use solvents

or abrasive cleansers.

4 103887 01

3. OPERATION

3.1 DISPLAY AND KEYBOARD

The various keys on the keyboard have the following functions (cf. Fig. 1 on the cover of

the user’s guide):

ITEM KEYBOARD Description:

ON/OFF Switching instrument on/off.

% 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.

AUTO AUTO ramp or AUTO-STEP function is started

or stopped.

DOWN ARROW “Less” key. If the key is held down, the key

press is repeated.

UP ARROW “More” key. If the key is held down, the key

press is repeated.

STEP The STEP function is activated or de-activated.

FUNC. (FUNCTION) Change-over takes place between SOURCE

mA, MEASURE mA and MEASURE Volt

function.

PWR. (POWER) Change-over takes place between EXT. (the

+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):

ITEM DISPLAY SEGMENT Description:

Shows numerical value in mA, %, V or sec.,

and for readout of error codes etc.

EXT (EXTERNAL) External loop supply is selected.

INT (INTERNAL) Internal loop supply is selected, the internal

+24VDC of the mAcal being used to supply the

current loop with power.

MEASURE Measurement of current or voltage is selected

(indicated by unit).

SOURCE Generation of current is selected.

STEP The STEP function is active. When the

segment flashes, this indicates that the AUTO-

STEP function is activated.

%, s, V or mA Indication of unit for readout numerical values.

103887 01 5

ITEM DISPLAY SEGMENT Description:

LOW BAT (LOW

BATTERY)

When this segment is lit, the voltage in the batteries

is less than 3.5 V, and they should be replaced.

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.

4-20 4-20mA is selected as the range, which affects the

readout in %, as well as STEP values

FLOW FLOW transmitters are selected, which affects the

readout in %, as well as STEP values.

VALVE Proportional transmitters are selected, which

affects STEP values and the AUTO-STEP function.

ITEM CONNECTIONS Description:

- Connection of black test lead -

+Connection of red test lead +

Connectio230mA.n to mains adaptor

6V DC, 230mA.

Note : The mains adapter does not charge

rechargeable batteries.

6 103887 01

3.2 SWITCHING THE mAcal ON/OFF

Press and the unit is switched on/off.

When the unit is switched on, the present battery voltage appears in the display for approx.

1 second.

Fit the red test lead into the connector marked “+”.

Fit the black lead into the connector marked “-“.

The mAcal is now ready for use. The unit automatically starts up in the function (SOURCE

mA, MEASURE mA or MEASURE Volt) which was active when it was last switched off.

3.3 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.

Press until the display shows SOURCE mA or SOURCE%.

Press for selection of INT or EXT (the present selection is shown in the

display).

If INT. is selected, the +24VDC of the current loop is generated by the mAcal itself. If EXT is

selected, the +24VDC of the current loop is generated by an external power supply.

Press for selection of readout in mA or %.

The display has the following appearance when 4mA is generated with internal loop supply:

Press and the generated current is increased.

Press and the generated current is decreased.

Press for activation of pre-defined current values (values depend

on selection of MODE and STEP SIZE).

103887 01 7

Press for automatic changing of current value. If STEP is selected

(the AUTO-STEP function), change-over takes place automatically between the pre-

defined current values. For proportional transmitters (VALVE), change-over takes

place between 3.8 - 4 - 4.2 - 4..... and 19 - 20 - 21 - 20..... mA

(the range is selected using the “up arrow” or “down arrow” keys).

The mAcal now generates the current shown in the display.

3.4 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.

Press until the display shows MEASURE mA or MEASURE %

Press for selection of INT or EXT (the present selection is

shown in the display).

If INT is selected, the +24VDC of the current loop is generated by the mAcal itself. If EXT is

selected, the +24VDC of the current loop is generated by an external power supply.

Press for selection of readout in mA or %.

The display thus has the following appearance in the measurement of 20mA in the current

loop.

The current is printed out with a resolution of 0.001mA:

The mAcal now measures the current shown in the display.

3.5 HOW THE VOLTAGE IS MEASURED

Connect the mAcal to the instrument to be tested as shown in Fig. 7 on the cover of the

user’s guide and switch on the unit.

Press until the display shows MEASURE V. Readout in %

cannot be selected.

The display thus has the following appearance in the measurement in V. The voltage is

printed out with a resolution of 0.1Volt:

8 103887 01

The mAcal now measures the voltage shown in the display.

3.6 HOW NEW PARAMETERS ARE SELECTED (SETUP)

Press for approx. 2 seconds. The present selection of

MODE is now shown in the display, e.g.

mA.

3.6.1 Selection of MODE

It is possible to choose between 5 different MODES:

 4-20mA LIN

 0-20mA LIN

 4-20mA FLOW

 0-20mA FLOW

 4-20mA VALVE

LIN - % calculated linearly.

FLOW - % calculated logarithmically.

VALVE - % not calculated.

AUTO-STEP function 3.8 - 4 - 4.2 - 4..... or 19 - 20 - 21 - 20..... mA.

Press or for selection of new MODE.

Press to save the present selection.

3.6.2 Selection of SLOPE TIME

After MODE has been selected, SLOP TIME (ramp time in the case of AUTO) can be

changed.

The text sis shown on the display for approx. 1 second.

Press or for setting of SLOPE TIME. The time can be

adjusted between 30 - 999 S.



ress to cancel a selection. SETUP is exited and it is necessary to

start all over again. This option can be selected at any time.

103887 01 9

Press to save the present selection.

3.6.3 Selection of STEP SIZE

After SLOPE TIME has been selected, STEP SIZE (step size in % of range) can be

selected for the transmitter types LIN and FLOW. If MODE 4-20mA VALVE is selected, a

fixed STEP SIZE is applied. The text is shown in the display for approx. 1 second.

Press or for setting of STEP SIZE. A choice can be

made between the step sizes 5%, 10%, 20%, 25%, 50% and 100%.

Press to save the present selection.

3.6.4 Selection of STEP TIME

After STEP SIZE has been selected, STEP TIME (the time between changes in the

AUTO-STEP function) can be changed. Either sor sis shown in the display.

Press or for setting of STEP TIME.

Press to save the present selection.

3.6.5 Selection or de-selection of automatic OFF function

After STEP TIME has been selected, it is possible to select or de-select the AUTOMATIC

OFF function (mAcal automatically switched off approx. 30 minutes after a key has last

been activated).

The text is shown in the display for approx. 1 second. Alongside, the text or

appears.

Press and AUTOMATIC OFF is selected. appears in the

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.

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