Extech HD700 Differential Pressure Manometer (2psi) HD700 用户手册

HD700-EU  V1.2  12/09 

3 

The HD700 uses a 9V battery for power. If the meter does not switch on when the POWER 
button is pressed or if the display shows BAT, replace the battery. 

When the POWER buttons is pressed, the meter performs a short self-test and reverts to 
the settings in place when the meter was last turned off. 

In order to conserve battery life, the meter has an automatic power off feature (after 20 
minutes). To defeat this feature, press and hold the HOLD button while turning the meter 
on. Release the HOLD button when ‘n’ appears on the display. The meter will now remain 
on until the user turns it off or until the battery weakens. Note that the Auto Power OFF 
feature will be reactivated the next time the meter is turned off and then on. 

Press the UNIT button to select the unit of measure. This meter offers eleven (11) units of 
measure as listed below. 

 

Pounds per square inch 

psi 

Inches of Mercury 

inHg 

Milli-bar mbar 

 

Millimeters of Mercury 

mmHg 

Kilo-Pascals kPa 

Kilograms per centimeter squared 

Kgcm

2

 

Inches of water 

inH

2

O 

Feet of water 

ftH

2

O 

Centimeters of water 

cmH

2

O 

Bars Bar 

Ounces per square inch 

ozin

2

 

 

Connect tubing to the P1, P2 (or both) input port(s). If both inputs are used (differential 
mode), the meter displays a positive pressure reading if the P1 pressure is greater than P2 
and a negative reading if P2 is greater than P1. 

 

To ZERO the meter: Before use and without fittings attached to the meter, press and hold 
the HOLD button for 3 seconds or until the display shows all zeroes. 

 

To OFFSET meter readings: Press the DIF button while taking a measurement. 
Subsequent readings will represent the difference between the current measurement and 
the measurement that was on the display when the DIF button was pressed.