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10. Measured data acquisition
10.2.1
Sleep mode
For long-term monitoring involving large measuring cycles where power is
supplied by rechargeable or normal battery the measuring system can also be
operated in sleep mode. In energy-saving sleep mode the measuring instru-
ment switches off after each measuring point scan and switches on again au-
tomatically after the cycle expires ready for the next measuring point scan. In
this way with just one battery recharge up to 30000 measuring point scans can
be performed; for a cycle lasting 5 minutes this represents a measuring capa-
bility of over 100 days.
For a data recording in sleep mode go to AMR-Control <Device program-
ming> and take the following steps :
1. Enter a cycle lasting at least two minutes.
2. Activate saving to memory in the cycle.
3. Activate sleep mode.
4. Start measuring operation as normal; the device should then switch off; as
a check the LED ´ON´ (3) should flash rhythmically on and off.
6. In the specified cycle the instrument switches on automatically, performs
one measuring point scan, and then switches off again.
7. Terminating a measuring operation key twice presses (2e), function ´ON´
and ´STOP´.
In this way any number of measuring operations can be performed in sleep
mode up until when sleep mode is deactivated again. With cycles shorter than
2 minutes measuring operations are performed automatically in normal mode.
10.2.2
Device-internal measured value memory
(option S)
With option S the master measuring circuit board of system 5690-1M incorpo-
rates a memory with a 512-KB EEPROM, sufficient for 64000 to 100000
measured values (depending on the number of channels). This memory is
non-volatile; i.e. it retains data intact even in the event of a failure affecting the
lithium battery used to buffer the real-time clock. How this measured value
memory is organized and how data is recorded to it and output from it are de-
scribed in the Manual, Section 6.9. It can be configured either as linear
memory or ring memory; (see Manual 6.10.13.2).
As on all other ALMEMO ® data loggers the internal memory supports the fol-
lowing functions :
Recording to ring memory
Sleep mode
Data output in any normal format
Selective data output according to date and time
Selective data output by number
However, only one connector configuration is possible.
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