EXTECH EX840 [9/12] Automatic power off

EX840-EU-EN-V5.3-3/12

Data Hold

To freeze the LCD reading, press the HOLD button. While data hold is active, the HOLD icon

appears on the LCD. Press the HOLD button again to return to normal operation.

Peak Hold

The Peak Hold function captures the peak AC or DC voltage or current. The meter can capture

negative or positive peaks as fast as 1 millisecond in duration.

1. Turn the function switch to the A or V position.

2. Use the MODE button to select AC or DC

3. Allow time for the display to stabilize.

4. Press and Hold the PEAK button until “CAL” appears in the display. This procedure will zero

the range selected.

5. Press the PEAK button, Pmax will display.

6. The display will update each time a higher positive peak occurs.

7. Press the PEAK button again, Pmin will display. The display will now update and indicate the

lowest negative peak.

8. To return to normal operation, press and hold the PEAK button until the Pmin or Pmax

indicator switches off.

Note: If the Function switch position is changed after a calibration the Peak Hold calibration must

be repeated for the new function selected.

MAX/MIN

1. Press the MAX/MIN key to activate the MAX/MIN recording mode. The display icon "MAX" will

appear. The meter will display and hold the maximum reading and will update only when a new

“max” occurs.

2. Press the MAX/MIN key and “MIN” will appear The display icon "MIN" will appear. The meter

will display and hold the minimum reading and will update only when a new “min” occurs

3. Press the MAX/MIN key and a blinking “MAX MIN” will appear. The meter will display the

present reading, but will continue to update and store the max and min readings.

4. To exit MAX/MIN mode press and hold the MAX/MIN key for 2 seconds.

Temperature Units (˚F / ˚C)

The temperature units selection switch is located in the battery

compartment. To change the units, remove the battery door, lift out the

battery and set the switch for the desired units.

LCD Backlight Button

The LCD is equipped with backlighting for easier viewing, especially in

dimly lit areas. Press the backlight button to turn the backlight on. Press

again to turn the backlight off.

Automatic Power OFF

In order to conserve battery life, the meter will automatically turn off after approximately 25 minutes.

To turn the meter on again, turn the function switch to the OFF position and then to the desired

function position.

Units Switch