Extech Instruments 412300A User Manual Download Page 3

412300A-EU-EN v3.4   07/13 

3

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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Summary of Contents for 412300A

Page 1: ...User Guide Model 412300A Current Calibrator actoolsupply com actoolsupply com actoolsupply com Extech 412300A NIST Current Calibrator Meter Extech 412300A Current Calibrator Meter ...

Page 2: ... 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...

Page 3: ... 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 Mea...

Page 4: ...e 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 locat...

Page 5: ...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...

Page 6: ...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 ...

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