Sensor Programming
A new feature is the presence of four device-internal channels:
M9 is programmed by default as differential channel M1-M0; this applies if
there are two sensors with the same units and same decimal point position
connected at measuring points M0 and M1. However, all four channels can be
used in conjunction with any function channels with standard reference chan-
nels Mb1=M1 and Mb2=M0 assigned; i.e. if you want to program a function pa-
rameter without reference channel on a device-internal basis, the sensor must
be connected to M1.
Advantage of device-internal channels:
If several sensors are being used for the same application, they do not have to
be reprogrammed and can be freely exchanged without losing their function
channel assignment. However, if the whole application operates with just one
sensor, then programming on the sensor itself makes more sense.
11.3.11 Special meas. ranges, linearization, multi-point calibration
Thanks to the new ALMEMO special connectors with extra memory for addi-
tional data (larger EEPROM, code E4) the following tasks can now for the first
time be elegantly performed :
1. Provision of special measuring ranges with internal characteristic (s. 10.3.9)
2. Linearization of signals for voltage, current, resistance, or frequency
set by the user
3. Multi-point calibration of all sensors
The ALMEMO 2890-9 can as standard evaluate all appropriately programmed
connectors. With the special KL variant it is also possible to convert measur-
ing signals into appropriate display values in line with a characteristic of up to
30 support values. These support points are programmed to the EEPROM in
the ALMEMO connector using the AMR-Control software. During a measuring
operation the measured values are interpolated between these on a linear ba-
sis. When correcting non-linear sensors (e.g. with Pt100 or thermocouple sen-
sors) initially the original characteristics are considered; then only the
deviations are interpolated on a linear basis and inserted.
If a channel with a characteristic is deactivated or programmed with a different
range, the characteristic is subsequently reactivated by programming the spe-
cial range ´
Lin
´ by means of the keyboard or command
“B99”
.
ALMEMO
®
2890-9
61
M0 M1 M2 M3 M4
00
10
20
30
03
13
23
33
04
14
24
34
01
11
21
31
02
12
22
32
1.Channel
2. Channel
3. Channel
4. Channel
A2 A1 DC
05
15
25
35
Device internal channels
Difference M01-M00
Sensor channels