13. Sensor programming
60
A new feature is the presence of 4 device-internal channels. The first
(M2/M4) is programmed by default as differential channel M1 – M0 (see 11.3), if
two sensors with the same units and same decimal point position are connected
at measuring points M0 and M1; the fourth is used for average values (see 12.2).
However, all four channels can be used in conjunction with any function chan-
nels with standard reference channels Mb1 = M1 and Mb2 = M0; i.e. if you want to
program a function parameter 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.
13.11 Special meas. ranges ,Linearization ,Multi-
point calibration
Thanks to the new ALMEMO
®
special connectors with extra memory for addi-
tional data (bigger EEPROM, code E4) the following tasks can now be per-
formed for the first time with great elegance :
1. Provision of special measuring ranges with internal characteristic (see 13.9)
2. Linearization of signals for voltage, current, resistance, or frequency - set by the user
3. Multi-point calibration of all sensors
The ALMEMO
®
2590A as standard can evaluate all appropriately programmed
connectors. On leaving the factory any device as of ALMEMO
®
2690-8 with the
special KL variant can, using the ALMEMO
®
-Control software, program meas-
uring signals as per a characteristic of up to 36 support values to the EEPROM
on the ALMEMO
®
connector. During a measuring operation the measured val-
ues between these points are interpolated on a linear basis. When correcting
sensors with linearization in their standard measuring range (e.g. with PT100 or
thermocouple sensors) initially the original characteristics are considered; only
then are the deviations interpolated on a linear basis and inserted.
If a channel with a characteristic is deactivated or programmed with a different
range, the characteristic can subsequently be reactivated by programming the
special range ´Lin ´ using the keypad or command ´B99´.
13.12 Special functions
On the 2590A measuring instrument, in the 2
SPECIAL FUNCTIONS
menus, all sensor parame-
ters can be accessed; these may be needed only
occasionally in routine operation but may be very
useful in many applications (see Manual 6.10).
Some of these functions are highly complex and
should only be used if you are fully aware of how
they work and what effect they have.
These 2 special functions menus can be reached
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