Extech Instruments 412300A Manuale utente

User Guide

Model 412300ACurrent Calibrator

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Extech 412300A-NIST Current Calibrator Meter

Extech 412300A Current Calibrator Meter

412300A-EU-EN v3.4 07/132

Introduction

Congratulations on your purchase of the Extech Current Calibrator Model 412300A. The 412300A

can measure/source current and can also power a current loop. A built-in five location memory

can store customized calibration current output steps. The Oyster Series meters have a

convenient flip up display with neck-strap for hands-free operation. This meter is shipped fully

tested and calibrated and, with proper use, will provide years of reliable service.

Meter Description

1. LCD display

2. Battery Compartment

3. AC adaptor jack

4. Calibration Cable input

5. Function

switch

6. Neck-strap

posts

7. Keypad

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Keypad and Switch Descriptions

POWER BUTTON and AUTO POWER OFF FEATURE

1. Use the POWER button to turn the unit ON or OFF. When the unit is powered up, a short self-

test will ensue after which the display will stabilize.

2. This meter can either be powered by one 9V battery or an AC adapter.

3. When the battery symbol appears on the LCD display, replace the battery as soon as possible.

Low battery power may cause inaccurate readings and erratic meter operation.

4. This instrument is equipped with Auto Power OFF which turns the meter off after 10 minutes of

inactivity. To override this feature; press and hold the MODE button until the display shows

(auto power off de-activated) or (auto power off activated).

FUNCTION SLIDE SWITCH

1. Slide the Function switch on the side of the meter to the desired function (Source/Measure or

Power/Measure).

2. In the Source/Measure position the meter can be used to generate current or measure current

(MODE button is used to choose Source or Measure).

3. In the Power/Measure position, the meter can power a current loop with 24Vdc and, at the same

time, measure the current.

MODE BUTTON

Press the MODE button to select either SOURCE (output) or MEASURE (input). This applies when

the Function switch is set to Source/Measure.

UNIT BUTTON

Press the UNIT button to select mA or %units.

▲▼ INCREASE / DECREASE BUTTONS

Use the ▲▼buttons to increase or decrease the output current value in the source mode.

1. Press the

▲button once to increase the value in one digit steps.

2. Press and hold the ▲button to increase the value in 10 digit steps.

3. Press and hold the ▲button >2 sec and then press the ▼to increase the value in 100 digit

steps

4. To decrease the value, use the ▼button as described above.

ZERO BUTTON

The ZERO button manually zeros the display in the MEASURE mode.

1. Set the meter to the MEASURE mode

2. Short the input jack

3. Press and release the ZERO button

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MEM BUTTON

The memory feature provides the user with five (5) user programmable source values for stepped

calibration outputs. The feature is available for mA and %units in the SOURCE mode. The stored

values are kept in non-volatile memory (memory that is retained even after power is removed from

the calibrator).

Source from the stored memory values:

1. Select the Source mode as described earlier

2. Press the MEM button. The M1 icon (memory location 1) will appear in the display and the

value stored in that location will be displayed and sourced.

3. Repeated pressing of the MEM button will step through the 5 memory locations.

NOTE: The “SOURCE” icon will blink when the output value has not reached a stable level.

The common cause for the “SOURCE” icon to remain blinking is that the load impedance is

too high in the current mode.

Storing values into memory:

1. As described above, select and display a memory location (M1, 2, 3, 4, or 5)

2. Use the

▲▼buttons to adjust the display to the desired source value.

3. Press and hold the MEM button for > 2 seconds. The displayed value will be stored in the

displayed memory location.

Default memory values.

Five common source values are permanently programmed in memory as the default values.

These values can be replaced by user selected values.

To reset the meter to the default memory values:

1. Turn the meter on and select the SOURCE mode.

2. Press and hold the POWER button until appears in the display and then release the

POWER button. The memory locations will revert to the default values.

Default Memory Values

M1 M2 M3 M4 M5

mA 4mA 8mA 12mA 16mA 20mA

% 0% 25% 50% 75% 100%

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Modes of Operation

MEASURE (Input) Mode of Operation

In this mode, the unit will measure up to 50mADC.

1. Slide the function switch to the SOURCE/MEASURE position.

2. Turn the meter ON

3. Press the MODE button to select MEASURE

4. Connect the Calibration Cable to the meter.

5. Connect the Calibration Cable to the device or circuit under test.

6. Read the measurement on the LCD display.

SOURCE (Output) Mode of Operation

In this mode, the unit can source current up to 24mADC at 1000 ohms

1. Slide the Mode switch to the SOURCE/MEASURE position

2. Turn the meter ON

3. Press the MODE button to select SOURCE

4. Use the UNIT button to select %or mA units of measure

5. Connect the Calibration Cable to the meter

6. Connect the Calibration Cable to the device or circuit under test

7. Use the

▲▼buttons to select the desired output value. Use the LCD display to verify the

output level. Alternatively, use the stored calibration values in memory as described in the

MEM button section.

8. Note that while the SOURCE display icon is blinking the calibrator is preparing to provide an

output but only after the icon stops blinking will the current actually be sourced.

9. For the -25% to 125% output range the output is 0 to 24mA. Refer to the Table below.

Display 25% 0% 25% 50% 75% 100% 125%

output

0mA 4mA 8mA 12mA 16mA 20mA 24mA

POWER/MEASURE Mode of Operation

In this mode the unit can measure current up to 24mA and power a 2-wire current loop. The loop

voltage is 24V.

1. Slide the function switch to the POWER/MEASURE position.

2. Turn the meter ON

3. Connect the Calibration Cable to the meter.

4. Connect the Calibration Cable to the loop. Open the current loop at any convenient location

along the signal path.

5. Read the measurement on the LCD display.

6. Use the UNIT button to select % or mA units of measure. In “%” mode the display will read

from -25.0 to +230.0% representing 0.00 to 50.00mA.

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Specifications

General Specifications

Display 9999 count LCD

Meter Power 9 volt battery or AC adaptor

Auto Power OFF Meter automatically powers off after 10 minutes of inactivity

Current output capability 24mADC at 1000 ohms

Operating Temperature 5ºC to 40ºC (41ºF to 104ºF)

Storage Temperature -20oC to 60oC (- 4oF to 140oF)

Operating Humidity Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC

(104ºF)

Storage Humidity <80%

Operating Altitude 2000meters (7000ft.) maximum

Dimensions 96 x 118 x 45mm (3.8 x 4.7 x 1.8") folded

Weight 340g (12 oz.)

Accessories Supplied 9V battery, AC Adaptor and calibration cable with spade lugs

Range Specifications

Mode Function Range (Resolution) Accuracy (% of reading

Measure Current 0 to 50mA (0.01mA)

± (0.075% + 1 digit) or ± 3 digits

(whichever is greater)

Percent (%) -25% to +230% (0.1%)

Source Current 0 to 24mA (0.01mA)

Percent (%) -25% to +125% (0.1%)

Power Loop Power 24VDC, <50mA

Battery Replacement

When the battery symbol appears on the LCD, replace the 9V battery as soon as possible.

1. Open the calibrator’s lid as far as possible.

2. With a coin or wide blade screwdriver, open the battery compartment moving in the direction

of the arrow embossed on the compartment cover (location of compartment is identified in

the meter description section).

3. Replace the battery and close the battery compartment cover.

You, as the end user, are legally bound (Battery ordinance) to return all used batteries

and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators at collection points in your

community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

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