DCP LogIT DataMetern1000 Kullanım Kılavuzu - Sayfa 12

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Advanced Programming

Advanced programming enables you to change the reading type of individual

sensors and/or allocate all of the data memory to just one logging session,

greatly expanding the storage capacity for an experiment. Although these can

be very useful and powerful facilities, they are quite complex and only

recommended for those who are experienced with datalogging. Please note

that not all software is able to take advantage of all of these facilities.

•Advanced setup

DataMeter uses sensors which self identify and scale themselves automatically

to a standard default reading type/function.

Advanced setup allows you to choose other functions or parameters for some of

these sensors . For example, instead of reading the default frequency in Hz on a

digital sensor (counts per second) you could choose to display rate in counts per

minute.

Advanced setup can be found in the Setup Logging menu and it offers the

following sensor reading types which can be independently assigned to different

sensors using the blue key to select sensor and red / green keys to select reading

type:

Reading type

Description

Auto

The normal default automatic reading type

Displays analogue sensor actual voltage output in mV

0 or 1

Displays logic state of digital sensor-good for testing

Counts

Count digital events during selected interval(max 255)

Shows number of events / second from digital sensor

Per min

Shows number of events per minute from digital sensor

Period

Shows time between digital events (max. 2.5 seconds)

You may find this facility particularly useful when making your own sensors using

the Designer sensor adapter set but please use with caution - particularly when

using the mV setting with voltage probes and adapters (for example, it can

display mV instead of Volts!).

You can also program a specific logging rate similar to before but please note

the 'Set Logging rate - uses all memory!' display warns you that you are assigning

ALL of the memory to just one experiment. This gives you much more memory than

normal but if you use it all it will overwrite any other data you have in memory, so

use with care. Instead of logging you can go to meter mode to display readings

live (the display shows the reading type you have set regardless of any sensors

plugged in) or use AutoLog as normal (except for counting).

Because Advanced programming is so powerful it could also be confusing or

misleading if it were left in a programmed condition indefinitely (and maybe used

by somebody else). Therefore we have ensured that DataMeter returns to

standard logging settings after each advanced programmed logging session or

switch off.

AutoLog automatic data logging

AutoLog is DataMeter's built-in intelligent logging system. Although you can

manually program DataMeter's sampling speed, sensor types etc, AutoLog

works out the best compromise between memory & sampling rate and you will

probably find it will prove ideal for most of your work.

•Start AutoLog

Choose the sensor(s) you wish to use, plug them into DataMeter and check the

meter display. When you are ready to start Auto-logging just press the green

button (NB you will find Start AutoLog in the Setup logging menu but pressing

green button from meter mode is quicker).

•Power save

If your experiment lasts longer than a few minutes then DataMeter will blank the

display to save battery power but it is still recording results. To bring back the

display at any time, press the blue button.

•Marking events

You can add marker(s) at particular times or readings you wish to emphasise by

pressing the green button again whilst logging- this will appear as an arrow or

mark on the graph (not used on all software).

•Stop AutoLog

Pressing the red button will stop the logging and you can then either transfer the

data to your computer or do further experiments; DataMeter can store up to 4

separate experiments in its memory on a rotation basis so you always have the

last 4 sets of data available. AutoLog can record for up to 3 months, depending

on battery.

•How does AutoLog work?

AutoLog works on the principal that with short experiments you are likely to want

to capture a lot of data quickly, whereas longer experiments will probably

require less data so the sampling rate is slower. As you start Auto-logging

DataMeter does not know how long your experiment will be and so it starts

recording quickly (64 per second) and then gradually, as time goes on, reduces

the sampling rate. So that memory is used efficiently DataMeter manages space

so that old results are deleted to make way for new ones.

AutoLog sampling rates:

First 4 seconds

64 readings per second

Next 4 seconds 32 readings per second

Next 8 seconds 16 readings per second

Next 16 seconds 8 readings per second etc etc

In reality of course; all of this is worked out by the internal microprocessor and

stored as consistent sets of results so that you never actually need to worry about

how it works - after all, technology should make life better and easier, not more

difficult!

Tip Remember that shorter experiments store data at a faster rate.