9
8
D. MEASUREMENT TECHNIQUES
1. Controls and Functions (continued):
Instrument Layout
Keypad
Gooseneck
Display
Sensor cage containing
the sensor and visual
alarm indicator
Speaker
Alarm LED
On Indicator
Tick adjust wheel
D. MEASUREMENT TECHNIQUES
2. Step by Step Procedures:
WARNING!
Turn the 721 in a “clean air” environment away from the
test area. Failure to do so may cause the 721 to display
sensor error and turn off.
Measurement Procedure:
1. Turn the 721 on by pressing the key. The 721 will begin
a 30 second countdown and “wait” will display. During this
countdown the sensor is being self tested and set to zero.
2. After the countdown is complete the 721 will display “0” and a
tic rate will begin.
3. At this point the display mode can be selected. Once the dis-
play mode is selected the 721 will turn on in the same mode
each time unless changed. If the display mode does not need
to be changed, proceed to step 8.
4. To change the display mode press and hold the key for
approximately 3 seconds to enter menu mode. The following
will be displayed:
5. Press the key to proceed to the display mode screen.
Earphone
Jack
721 manual_082208.qxd 11/11/2008 7:09 AM Page 8
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