Alnor APM 150, Owner'S Manual, Page: 14 / 78

10
10
A. APM 150 Keypad and Menus
The APM 150 Keypad
Each key has two different functions. The
primary
function is shown above the diagonal line on the
key’s surface. The
secondary
function is shown
below the diagonal line. A more detailed
description of each function follows.
In the
RUN
mode, if a key is held for
less than
three seconds
, the primary function is activated.
When a key is held for
more than three seconds
,
the secondary function is activated. The
exceptions to this are the
↑
and
↓
keys. Because
they are used to move between menu options,
these keys do not function in
RUN
mode.
The cycle time of the
APM 150 software
may cause the meter to react slowly to a key push.
The reaction time of a key push will vary with
different functions (1–3 seconds). Do not push a
key twice because of a slow response time. Doing
so may result in accidental activation of a
secondary function or duplication of a desired
function.
Primary Key Functions:
ON/OFF
This key is used to turn the
instrument on or off when in the
RUN
mode. If the instrument is in
any other mode, pressing this key
will exit that function and go back
to the
RUN
mode without making
any changes.
VOL
(Used only if a 175 or 275 probe is
attached.) The
VOL
key prepares
the APM 150 for air volume
measurements. After pressing this
key, you must indicate whether
you’re measuring by area, or
whether you’re measuring a round
or rectangular duct. Choose one of
these options by pressing the
↑
or
↓ key, followed by the ↵ key to
make a selection. After you make
your selection, use the
↑
or
↓
key
to enter the dimensions, then the
↵ key to enter the units.
MENU MENU
allows you to select one of
several options. Use the
↑
or
↓ keys to move through the
choices. To choose a selection,
push
↵
, or return to
RUN
mode by
pushing
ON/OFF
. The
MENU
selections are as follows:
[
] Changes memory page
[ ] Prints all stored data
[ ] Correction Factor
[ ] Enables or disables auto
shut-off
[ ] Scans meter voltages
[ ] This is only used by the
factory
[ ] Enables or disables the
serial port
[ ] Time constant selection
(See also “Menu Selections,” next
page.)
HOLD
Pressing this key freezes data in
RUN
mode for input to memory or
output to a printer. The display
flashes. Pushing
HOLD
again
stores and prints your data.
Pressing
ON/OFF
returns you to
RUN
mode without storing or
printing.