7. MEASUREMENT
The switchboard instrument ALMEMO
®
4490-2 provides the following options
for the acquisition of measuring data:
1. Continuous measurement of a selectable meas. point, see man. 6.4.
Output of measuring data to the analogue output, see man. 5.1.1.
2. Continuous measuring point scan, see manual 6.5.1.3.
Via serial interface only:
3. Single measuring point scan, see man. 6.5.1.1.
4. Cyclic measuring point scan, see man. 6.5.1.2.
7.1 Continuous Measurement of a Measuring Point
In the basic setting (e.g. after a reinitialisation, see 3.3) only the measured
value of a selected measuring point, which is at first M0, is continuously
acquired with the specified conversion rate (see man. 6.5.4). This is the
optimal operating mode for data recording with analogue output.
7.1.1 Selecting the Measured Value and Measuring Point
After switch-on the function
MEAS.VAL.
is automatically set and the measured
value of the previously selected measuring point will be displayed. After a reset
(see 3.3) this will be channel M0. After selecting other functions using the keys
F1
and
F2
it is possible to return to the display of the measured value by using
the key
MEAS.VAL.
▲
.
For ALMEMO
®
sensors with several channels, it is possible in function
MEAS.VALUE
and by using the key
MEAS.VAL.
▲
to successively select all other
active measuring points and to indicate the actual measured value. If the key
M
▲
is pressed and held (approx. 1s) the previous channel is indicated again.
The measuring point can be identified by the illuminated symbols M1, M2 or
M3; no symbol for M0. If the measuring range changes when switching over,
the abbreviation of the meas. range is indicated first. The selected meas. point
will be stored in the
EEPROM
and will be set again after a power failure.
Selecting the measured value:
MEAS.VAL.
2
3
.
4
°
C
Increase meas. channel with key:
M1
MEAS.VAL.
5
1
.
8
%
H
Decrease meas. channel with key:
press and hold (approx. 1s)
1s
MEAS.VAL.
In case of a sensor breakage the abbreviation of the
meas. range will flash instead of the meas. value (s. 6.2).
N
i
C
r
°
C
ALMEMO
4490-2
25
Continuous Measurement of a Measuring Point
