10. Measured data acquisition
10.2 Offline measurement
For offline measuring operations, i.e. data logging in the device itself, either the
device's own 8-MB flash memory or an external memory connector with a mi-
cro SD card must be used.
It is an indispensable prerequisite that the following parameters be configured :
1. Date, time-of-day
2. Cycle or scan cycle with saving to memory activated
3. Sleep mode, possibly
The easiest way to do this is by means of our ALMEMO
®
Control software, in
menu <Program device> and <Measured value memory - Save to memory>.
To
start and stop a measuring operation
on site there are numerous me-
thods available. (see Man. 6.6)
1. Press the
START / STOP
key (2) on the device.
2. Program the start date and time-of-day and then either the end date and
time-of-day or the fixed measuring period. (see Man. 6.6.2)
3. Reaction in the event of a limit value being overshot or undershot (
see Man.6.6.3
)
4. Triggering in response to electrical signals (see Man. 6.6.4)
The status of a measuring operation and of data recording can easily be traced
by watching the LEDs. (see 9.2)
To
read out the measured data
select ALMEMO
®
Control menu item <De-
vices - Measured value memory>. (see Man. 6.9.3) Here you can transfer to a
file on the PC either the complete memory or parts of it selected according to
date or by number; the device memory can then be cleared.
10.2.1 Sleep mode
For long-term monitoring involving long measuring cycles where power is sup-
plied by rechargeable or normal battery the measuring instrument 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 auto-
matically after the cycle expires ready for the next measuring point scan. In this
way, with just one battery recharge, it is possible to perform up to 30,000 mea-
suring point scans; with a cycle lasting 5 minutes this represents a total runtime
of over 100 days.
For data recording in sleep mode go to ALMEMO
®
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. Switch sleep mode on.
4. Start measuring operation as normal; the device should then switch off auto-
matically; as a check the LED 'ON' (3) should flash rhythmically on and off.
24 ALMEMO
®
809
