Measurement Procedure - Extech Instruments TB400 User Manual

Measurement Procedure
Calibration
1. Ensure that the meter has been calibrated prior to use.
2. Refer to the calibration section for this procedure.
Sample Preparation
1. Place the testing liquid into the supplied sample bottle up to the 10mL line and secure
the cap to the bottle.
2. Clean and dry the outside of the sample cup to ensure a clean surface.
Measurement
1. The meter should be switched OFF.
2. Open the test chamber cover and Insert the testing bottle completely into the chamber.
3. Line up the white mark of the testing bottle with the white mark on the edge of the test
chamber.
4. Close the chamber cover and lock it in place.
5. Press the "POWER" button to turn on the meter.
6. Momentarily press the "TEST" button. The display will flash "tESt" for approximately 10
seconds and then the turbidity value, in NTU units, will be displayed.
7. Momentarily press the OFF button to turn off the meter.
Data HOLD
Press the "HOLD" button once while taking a measurement to freeze the value on the display.
Press "HOLD" again to release the Data Hold function.
Data Record (MAX/MIN Readings)
1. The data record function records the MAX and Min readings. Press "REC" button once to
begin data recording. The LCD will display the "REC" symbol.
2. In recording mode press "REC" once. The display will show the maximum reading and "REC
MAX" will appear on the LCD display.
3. Press "REC" button once again and "REC MIN" will appear on the LCD along with the
minimum reading.
4. To delete the MAX or MIN value press "HOLD" once. The LCD will display "REC".
Auto‐Power OFF
The Auto Power OFF feature automatically switches the TB400 OFF 10 minutes after the last key
press.
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