Windmill Software Ltd
Windows Engineering Software

Windmill Logger

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Windmill Logger records data from up to 100 analogue and digital channels. To log from more channels simply open more copies of Logger. Each set of samples is time stamped, and you can vary the sampling rate from less than once per hour up to 200 samples per second. For long term logging Logger will create a separate file for each hour, each day or each week, and if required can overwrite old data to continue logging indefinitely.

The picture above shows data being logged from 3 channels every 5 seconds. Channels in alarm are shown in red.

To start and stop logging from different rigs independently, or to log several sets of channels at different rates, start several Logger windows.

Logger saves the data in an ASCII text file. The data file will look like this

Windmill Logger
File opened at 18:23:39 Tue 20 Mar 2005
File closed at 18:23:45 Tue 20 Mar 2005  

Time        InputA     Channel2
Secs        volts      volts	
18:23:39    1.21869    10	
18:23:40    2.41922    10	
18:23:41    3.58368    10	
18:23:42    4.69471    -10	
18:23:43    5.73576    -10	
18:23:44    6.6913     -10	

You have four choices of how to trigger data logging.

• Start logging when your equipment sends new data
• Start logging when readings cross one of your alarm thresholds
• Start logging when you press the space bar on the keyboard
• Start logging when you press the software Start button

The first option lets your equipment determine when Windmill takes readings. It is useful, for example, if you are using a balance and don't want to record the weight of the same item twice. Windmill monitors the balance, and only saves new readings. Even if two items weigh the same, Windmill knows that a change has occurred and logs the second reading.

With Windmill you can set warning and critical alarms on each channel of data. Should you only be interested in saving data when alarm levels are crossed, you can tell Windmill to start logging only on alarm. You can also set the duration of logging. Say a temperature reading rose above a set point for 5 minutes. Windmill would log data throughout this time. When the temperature returned to normal, Windmill would continue logging for your chosen duration. It would then stop until another alarm occurred.

For more information about Logger you can download its Help file.