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display are standard feet per minute (S fpm) and
standard meters per second (S m/s), depending on
what units were ordered when the meter was
purchased. The units of measure cannot be changed
in the field.
Selecting Battery Life / Velocity Display
The
BATT/VEL
switch on the instrument allows you
to determine remaining battery life without turning
the unit off. With the unit on, slide the switch to
BATT
to read the approximate percentage of battery
life remaining. Slide the switch to the
VEL
position
to read the current velocity.
Selecting The Sensor Response
The Model 9880 has a
FAST/SLOW RESPONSE
switch for setting the display averaging time. In the
slow response mode, the Model 9880 displays the
average velocity measured during the past 12
seconds. This is a running average, so the display is
still updated once per second. In the fast response
mode, the meter displays the average velocity
measured during the past 3 seconds. The way the
Model 9880 averages velocity is by saving the
velocity measured each second into separate
locations in memory. Every second, a new reading
is taken and the oldest is thrown out. Depending on
the position of the sensor response switch, either
