Meter Description - Extech Instruments HD755-NIST User Manual

Introduction
Congratulations on your purchase of the Extech Manometer Model HD755. This device measures
gauge and differential pressure in the range of ±0.500 psi. The HD755 offers eleven (11) units of
measure (user selectable by front panel pushbutton) and has a differential input that uses
convenient quick‐disconnect fittings. Advanced features include DATA HOLD, MIN‐MAX‐AVG
RECORD mode, ZERO/OFFSET, AUTO POWER OFF, and USB PC interface. This meter is shipped fully
tested and calibrated and, with proper use, will provide years of reliable service. Please visit our
website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and
Customer Support.
Meter Description
1. P1 input
2. AC adaptor jack
3. P2 Input
4. LCD Display – Indicates the measurement data, unit of measure,
elapsed timer, and function symbols as described in this manual
5. USB PC interface jack (3.5mm) – For use with data acquisition
software
6. UNIT button – Press to select the unit of measure
7. DIF button– Press to display differential pressure. Also used to
OFFSET the displayed readings.
8. RECORD button– Press to access the MIN/MAX/AVG recording
mode
9. HOLD / ZERO button– Press to freeze the displayed reading. Also
used to zero the display (press and hold until display shows all zeroes).
10. BACKLIGHT
automatically turn OFF after 40 seconds.
11. POWER button – Press to turn the meter ON or OFF
12. Battery compartment (on rear)
button – Press to switch the display backlight ON. The backlight will
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