Alnor APM 150, Owner'S Manual, Page: 16 / 78

12
12
— O V dc.
— 4.965 to 5.025 V dc.
— battery voltage (3.5 V
fresh batteries)
Factory use only.
This option allows you to enable or
disable the serial port. In the normal
RUN
mode, the port must be
disabled (increases battery life).
To enable port
• At menu selection [
], press
↵
.
• Press
↑
or the
↓
until appears.
• Press
↵
.
To disable port
• At menu selection [
], press
↵
.
• Press
↑
or the
↓
until
appears.
• Press
↵
.
tc allows you to select from five
different speeds of display response.
• A setting of 1 is a quick response.
• A setting of 5 is a slow response.
B. Using the APM150
Basic Functions
To Change Units:
! Push the
UNIT
key until [ ] appears.
! Use the
↑
and
↓
keys to view new measurement
units.
!
The display annunciator ▲ will move to the
selected unit (see Figure 3).
!
Push
↵
to select a new measurement unit.
For example: To change the units of measurement
from cubic feet per minute (cfm) to cubic meters
per hour (m
3
/h) while using a thermo-anemometer
probe:
Figure 15—Display with annunciator and units of
measure
!
Push the
UNIT
key until [ ] appears.
! Push ↑ until the display annunciator ▲ moves
to m
3
/h, selecting cubic meters per hour.
! Push
↵
to select the measurement unit.
Note: Not all units are achievable with the
attached hood.
To Hold a Reading (For storage or printing):
! Push the
HOLD
key briefly until the measured
value flashes.
!
Push
HOLD
again to
STORE
this reading to
memory, or push
ON/OFF
to reject it and return
to
RUN
mode.
! If the meter is attached to the base, you may also
push the red button on the right handle for your
hold functions.
Measurement Modes
You can set the APM 150 for temperature or
volume measurement by pressing the
UNIT
key.
Volume Selection
(when a 175 or 275 probe is attached):
Air volume measurement is achieved by
multiplying a velocity reading by an area.
• When you press the
VOL
key, the [ ]
menu appears on the display and provides a way
to choose whether you are measuring by area (in
square units) or by a round or rectangular cross-
section.
• Make your selection by scrolling using the
↑
and
↓
keys, then pressing the
↵
key to accept your
choice.