Sensor Programming
channel assignment. However, if the whole application operates with just one
sensor, then programming on the sensor itself makes more sense.
10.4 Special Functions
The data logger 2690-8 has a separate menu
allowing access to all ALMEMO
®
special func-
tions, which despite only rarely being required
during routine operation, are very useful for
some applications (see manual 6.10). These
functions can (to a certain extent) be very
complex and should only be used if their ope-
ration is completely understood.
10.4.1 Print Cycle Factor
For the adaptation of the data recording to the update speed of the individual
measuring points it is possible to program a print cycle factor between 00 and
99 to output measuring points less often or not at all (see manual 6.10.6). Only
disturbed measuring points, e.g. on exceeding of limit values will always be
output. Generally, the print cycle factor of all measuring points is cleared or set
to 01, i.e. all activated measuring points will be output at each cycle. If a diffe-
rent factor, e.g. 10 is programmed, the corresponding measuring point will only
be put out once in ten times, however, if 00 is programmed it will not be output.
The data recording also allows to suppress unnecessary measured values
and, as a result, saves memory space.
Enter the print cycle factor (s. 8.5) in function:
Print cycle factor: 01
Clearing the print cycle factor with the key:
<CLR>
10.4.2 Minimum Sensor Supply Voltage
Similarly to all ALMEMO
®
devices, the sensor supply voltage is also monitored
in the 2690-8. It is also displayed in the menu
Power supply
(s. 10.7). Howe-
ver, there are also sensors, which require for a correct operation a supply vol-
tage, which requires a charged accumulator or a power supply unit. To avoid
measuring errors, the sensor programming allows to individually program the
required minimum sensor voltage for each transducer. In case of falling below
this voltage the measured value is treated as sensor breakage (indication L
flashes).
Entering the minimum sensor supply voltage:
U-Sensor Min: 12.0 V
Switching off the voltage control with the key:
<CLR>
U-Sensor Min: ---- V
ALMEMO
®
2690-8
59
* SPECIAL FUNCTIONS *
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±
Connector: 1 Channel: 11
Print cycle factor:
01
U-Sensor min:
12.0 V
7 Action max:
Start R1
7 Action min:
Ende R2
6 Analog-start:
0.0 °C
6 Analog-end:
300.0 °C
Output function:
MESS
1 Reference ch. 1:
(01)
1 Multiplexer:
(B-A)
Element flags:
IR
Calibration offset: -12345
Calibration faktor: 43210
M PRINT ESC
