Basic Operation - Extech Instruments 407910 User Manual

Basic Operation

Meter Power
This device uses a 9V battery for power. If the meter does not switch on when the POWER button is
pressed or if the display shows LBT, replace the battery (refer to the Battery Replacement section
later in this manual).
In order to conserve battery life, the meter has an automatic power off feature (after 10 minutes). To
defeat this feature, access the RECORD mode by pressing the RECORD/RECALL button. In the
RECORD mode, the meter will remain on until the user turns it off or until the battery weakens.
Unit of measure
Press the UNIT button to select the unit of measure. This meter offers eight (8) units of measure as
listed below, in the specifications chart earlier in this manual, and on the face-plate of the meter.
Units
MBAR
Kg/cm2
mm of Hg
m H O
2
Atmospheres
PSI
Inches of Hg
Inches of H
Zero Adjust and Offset function
Before use and without fittings attached to the meter, press the ZERO button to calibrate the
meter's circuitry. The display should then indicate zero.
If it is desired to offset the meter's display, press the ZERO button while taking a measurement.
Subsequent readings will be the difference between the current measurement and the
measurement that was on the display when the ZERO button was pressed.
Fittings Connection
Connect tubing to the quick-disconnect fittings and then snap the supplied quick-disconnect fitting(s)
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.
Displayed Symbol
"m" at bottom of the LCD and "Bar" at the top
2
Kg /cm
mm /Hg
m H O
2
ATP
PSI
in/Hg
O inch H O
2 2
4
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