HT30 V3.0 08/07

5

Auto Power Off

The Auto Power Off feature automatically turns the meter off after approximately 20

minutes. To disable this feature, hold down the

/SET and MODE/

for 2 seconds when

powering on the meter. The meter will momentarily display an “n” and enter measuring

mode. The meter will reset to auto power off mode when it is powered off.

Battery Replacement

When it is time to replace the batteries, the low battery indicator

appears in the bottom

left-hand corner of the LCD display. To replace the battery:

1. Open the battery compartment on the back of the meter.

2. Replace the two AAA batteries and close the compartment.

RS-232 PC Interface

The RS-232 serial data port (3.5mm phono jack) is located on the right side of the meter.

The PC interface hardware is intended for use with the Extech software package, Part

Number 407752 which includes Windows

software and PC interface cable. For more information, contact Extech or refer to the

407752 User's Manual.

Error Messages

An error message will appear on the display if the meter fails an internal diagnostic test.

1.

E2: The value is under range.

2.

E3: The value is over range.

3.

E4: The value is in error.

4.

E11: RH Calibration error.

5.

E33: Circuit error. Repair/replacement necessary.