DCP LogIT DataMetern1000 Instruction Manual - Page 13

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Snapshot Datalogging

An innovative facility built into DataMeter is Snapshot logging. It allows manual

control of when single sets of sensor readings are recorded.

Standard electronic datalogging records data at regular programmed or

automatic time intervals. But there may be times when you want to record

readings at a precise moment which you decide.

For example, if you wanted to check environmental (pH, temperature, DO2 etc)

levels at various points along a river you could take DataMeter and sensors and

when you are happy with sensor readings just press the green button to record

those results.

In this mode DataMeter works as a sort of electronic note pad, recording data

when you press a button.

•Start Snapshot logging

Select Start SnapLog from the setup logging menu. DataMeter will then record the

time and date and wait for you to start storing data.

•Recording data

Each time you want to record a set of readings press the green button - the

display will acknowledge with 'Readings stored'.

Tip You may wish to note where you take the readings.

•Power save

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

display to save battery power but it will still record data. If this happens just press

the blue button then take readings with the green button as before.

•Stop logging and downloading results

Press the red button to stop snapshot logging. You can then carry out further

logging sessions (up to 4 sets in total) or download results into your computer. The

way individual software displays this data will vary considerably but some will

show the time along the bottom of the graph and others will show the number of

readings (The start time and date may also be shown).

•Logging capacity

Snapshot logging can store up to 240 readings before the memory is filled. It can

be over a long period of time but the time stamp, which records the time from

start in seconds, will reset after 18 hours (not all software utilises the time stamp

facility).

Tip Some software will automatically extrapolate between data points to

produce a continuous line. However, If you want to see the points of actual data

at which individual readings were taken try selecting the 'display points' option or

alternatively analyse the data in tabular form (if available on your software).

Programmed Logging

This facility enables you to program DataMeter's logging parameters and is

divided into two menus; 'Set log rate' and 'Advanced setup'.

Set Log rate allows you to program the time interval between readings only,

whereas Advanced setup also enables you to set sensor logging types etc.

Before programming you need to consider the minimum time resolution you need

for your experiment as there is a direct trade off between time interval and the

total logging time.

•Set Log rate

This option is found in the Setup Logging menu. You can choose to either edit the

existing interval or start logging with the time interval shown (which will be the last

interval you set). If you select EDIT with the blue button you will be first asked to set

the time units required (using red and green buttons) which can be either ms

(milliseconds/ thousandth of a second), secs (seconds) or mins (minutes). When

you have reached the units of sampling interval required press the OK (blue)

button to move on to selecting the actual time interval from the choices given,

again using the red and green buttons to increase or decrease times.

As you change times you will notice that the 'Max:' number on the right changes

at the same time to give you the maximum duration of the experiment before the

memory is filled.

Your programmed logging interval

10mins:Max39 hrs

METER EDIT START

Go back to Meter

Change logging interval

When you have finished editing the interval just press the blue OK button and then,

if you are ready to start logging, press the green button to START logging. The

setup will remain the same until you change it (or DataMeter is reset) but you

always need to go to the Set Log rate menu to start programmed logging. When

the memory is full the DataMeter display will show 'Logging stopped' and return

to meter display. As with the other types of logging on DataMeter you can store

up to 4 sets of different results in the memory.

Setting the clock

DataMeter has an internal clock which some software makes use of to provide a

time and date stamp or record of exactly when an experiment was started.

To check or set the clock, press the blue button several times to reach the Time

and Date displayed on the top line - METER and ADJUST are shown below it.

Press the Green ADJUST key and then use the Red - and Green+ keys to increase

or decrease the part of the time or date the flashing cursor is over - then press

Blue OK button to move onto the next part of the time or date.

Maximum duration of experiment

Start programmed logging