Extech 412400 Operating Manual
Model 412400
Multifunction Process Calibrator
User's Guide
Introduction
Congratulations on your purchase of the Extech Model 412400 Process Calibrator. The Model
412400 can Measure or Source Current, Voltage, and Thermocouple Temperature signals. In
SOURCE/MEASURE mode, the meter can also Power and Measure simultaneously with 24Vdc
loop power.
The calibrator’s five (5) memory locations for each calibration function (which are also user
programmable) can be used to provide stepped outputs automatically. In automatic mode, the
output steps can be programmed to run continuously or in single-shot mode.
The Oyster Series meters employ a convenient flip up display with neck-strap (lanyard) for handsfree operation and run on battery power or from an AC adaptor.
This instrument is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service.
Meter Description
1. LCD display
2. Lanyard storage compartment
3. Positive test lead banana jack (red)
4. Negative test lead banana jack (black)
5. Thermocouple Input / Output jack
6. Lanyard posts (one on each side)
7. Battery compartment (bottom)
8. Keypad
9. AC adaptor jack
10. Flip up display
Display Description
10
9
8
5
7
6
1
2
3
4
1. Low battery icon
2. Auto Power Off icon
3. Numerical representation of measured, sourced, or stored signal value (also used to display
mnemonics for programming)
4. SOURCE or MEASURE mode status icon
5. Loop power indicator
6. Thermocouple types
7. Temperature unit of measure (Celsius)
8. Temperature unit of measure (Fahrenheit)
9. Millivolt unit of measure
10. Voltage unit of measure
11. Milliamp unit of measure
12. Per cent
13. Five memory locations
1
APO
2
3
4
5
6
2
24V Loop Power
412400-EU-EN v5.3 07/13
8
10
12
7
9
11
13
Operation
POWER BUTTON AND AUTO POWER OFF FEATURE
1. Use the POWER button to turn the unit ON or OFF. When the unit is switched on, a short selftest will display after which the LCD will stabilize.
2. This meter is powered by six (6) ‘AA’ 1.5V batteries or by an AC adaptor.
3. When the battery symbol appears on the upper left-hand corner of the LCD display, or if the
instrument does not switch on with a press of the POWER button, replace the batteries. 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 toggle this feature off and on, press and hold the POWER button (starting with the
meter ON) until the APO icon is on or off.:
MEASURE MODE
1. Press the POWER button. The meter will turn on in the MEASURE mode and in the function
last used.
2. Press and release the MODE I/O button to change to the function desired (Temperature,
Voltage, Current or Current with 24V Loop Power.
3. Press the UNIT TYPE button to select the current units (mA, %) or temperature units (°C, °F).
Voltage is autoranging.
4. In the temperature function, press and hold the UNIT TYPE button to change the thermocouple
type (J, K, T).
5. Connect the signal to be measured to the input jacks for current and voltage or the miniconnector for temperature.
6. Read the measured value in the display
INPUT ZERO
An input zero is performed when the meter is first turned on. The zero can also be performed
manually at any time (with or without an input signal connected
1. In the MEASURE mode, press and release the MEM/ZERO button.
2. The units icon will flash and after a few seconds the meter will return to normal operation.
MEASUREMENT OVER-RANGE and UNDER-RANGE INDICATION
In the Voltage and Current functions, measured signals above or below the specified ranges will
be indicated by “HHHH” for above range and “LLLL” for below range.
In the Temperature function, OPEN will be displayed if the measured signal is outside of the
specified range or a thermocouple is not inserted into the temperature jack.
3
412400-EU-EN v5.3 07/13
Loading...