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Version 1.27 (April 2001)

Version 1.26 (March 2001)


Version 1.25 (Feb 2001)


Version 1.24 (Feb 2001)


Version 1.23 (January 2001)


Version 1.22 (January 2001)


Version 1.21 (December 2000)


Version 1.20 (December 2000)


Version 1.19 (October 2000)


Version 1.18


Version 1.17 (September 2000)


Version 1.16 (August 2000)


Version 1.15 (August 2000)


Version 1.14 (not for user distribution)


Version 1.0 to 1.13

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Can I get a version of the OmniLog Software for Windows 3.1

The Omnilog Data Management Program will not run on Windows 3.11 or earlier. There is no plan, at present, to produce a Windows 3.11 version of this application.

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What is a Derived Channel

A Derived Channel is a channel derived from the data of existing channels and added to a dataset.
Examples of derived channels include:
    Absolute Humidity from Temperature and Relative Humidity
    Dew Point from Temperature and Relative Humidity
    Wind Chill Factor from Temperature and Windspeed

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I want to log a switch input on a GP-HR. How do I do it ?

This depends on the information you require from the switch. If you want to count the number of switch closures in each logging period, connect the switch to the logger Digital Pulse input (Channel 4, Pin 5 on the GP-HR) and set this channel up as a counter. If you need to know the state of the switch at each logging interval, connect the switch to any one of the three analog inputs (Channel 1 to 3 Pins 2 to 4 on the GP-HR) and set the channel to Switch.
Information on connecting a switch to the digital pulse input
Information on connecting a switch to an analog input

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What are plug-in reports

A number of reports come as a standard part of the Omnilog program. These include:

Logger Status Report Report on the Logger and Channel setup
Periodic Report For dividing logged data up into Hour, Day, Week and Month periods including Totals ,Averages, Maximums and Minimums for each period.
Grow Degree Days Report Accumulative Grow Degree Day calculations for a wide variety of crops
Switch Report Report showing the state of a switch on an analog channel including On and Off times and durations

These reports are included because they will be used by a large number of Omnilog users.

Other reports are available but are distributed separately to avoid make the Omnilog installation file too large. These reports will only be used by a small group of Omnilog users.

These Plug-in reports are small exe files that you put into the same folder as your Omnilog system. The Flow Totals Report is a good example of OmniLog Plug-in Reports.  

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Is there some detailed instructions about setting the gain etc in
the units and scaling and calibration sections of the channel set up screen.
They both appear to have the same affect. However sometimes if for instance
in Rain fall if the gain is set to 0.5 on one of them the pulses increment
by 0.5mm but the data is only recorded to the nearest 1mm and at other times
the recorded data is to the nearest 0.5mm.

Calibration Gain and Offset
These are used to convert the A2D converter and counter readings to SI Units
As much as possible we try to convert everything to SI units then Scale the readings to whatever the user requires.
There are five exceptions we have made because the SI units are of inconvenient scale
These are:
1... Temperature we use degC not degK
2... Distance we use millimeters not metres
3... Pressure we use hectaPascals not Pascals
4... For a milliVolt logger we use milliVolts not Volts
5... For a 20mA channel we use milliAmps not amps

Scale Gain and offset
These are used to convert the SI units (or our preferred units as listed above) to the users required units.
So for example:
A 4-20mA channel will be calibrated so that the Calibration Gain and Offset will give the correct result in mA
The Scale Gain and offset can be used to convert the mA's to any other units the user may want.
Another example:
Temperature Logger - the Calibration Gain and offset will give a reading in degC - the Scale Offset and Gain can be used to scale this to degF or degK.
This scaling can be done automatically by clicking the Select button in the Scale box and selecting the required units.

In the case of the rain gauge the Calibration offset and gain are used to get the logger reading in mm. .5mm per tip therefore 2 tips per mm therefore gain of .5
The scale offset and gain could be used to read in metres or feet or yards of kilometers or miles or even fathoms if the user requires. The Select button will only give the common conversions and as feet and metres of rain are uncommon the only options available are inches and tips.

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Your web site says that the GP-HR logger has 64k of memory in 8 bit mode
and 32k of memory in high resolution (12 bit mode), The data sheet I rececived from the agent said it had 32k in 8 bit and 16k in 12 bit modes. Which is correct?

The HR series of loggers was originally released with 32K of memory giving 32,000 readings in low res and 16,000 readings in high res mode. When a compatible 64K memory chip became available at a price that we could upgrade the HR's to 64K without increasing the price, we decided to do so. This happened in Jan 2002. You can determine if an HR logger has 32K or 64K by looking at its Firmware Number. This is shown in the Logger Status Screen in the Logger Control Window. If the Firmware number is 3.3 or less the logger has 32K memory. If the Firmware number is 3.4 or greater the logger has 64K of memory. The Omnilog software was updated at the changeover so that it would correctly identify the loggers that had 64K of memory. This was Omnilog Version 1.35. If you are using an HR logger with a firmware number of 3.4 or greater you should be using Omnilog 1.35 or greater. The latest version of Omnilog can be downloaded from our website.

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The Help in the Omnilog software I got with the GP-HR mentions a Timer 1 function on the Start Logger Dialog box that can be set to 0 for standrd counting of pulses that resests each logging interval or averages the pulses over a set time interval. The Start Logger Dialog box on our software does not show this fuction yet it is shown on example on your website. Do we have an out of date software version? If so what can we do about it?

The Omnilog software is used to read a number of different logger types
including our older DL series, the HR series you are using, our GP-MC Multi
channel logger and some Weather stations we also support. The help file
includes reference to Channel 1 Incremental Smoothing, Timer 1 Average Time
and Averaging Sub Interval. These functions are only available on the GP-MC
and Weather stations. They are not available on the HR or DL series of
loggers and will therefore not show in the Logger Control Screen when a DL or HR loggers is connected.

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To maximise data storage we set channel 4 of a GP-HR to 8 bit as there will never be
more than 255 pulses per logging period. Can you explain why the pulses are not being recorded when channel 4 is set to 8 bit res? Is this not permitted or are we not setting something up

The HR series of data loggers has 12bit Analog to Digital converters and 16 bit digital counters
In Hi Res mode the full AtoD value or Counter value is stored in the loggers memory
In Low Res mode only the Most Significant 8 bits are stored
In the case of the AtoD channels the Least Significant 4 bits are truncated off
In the case of the Counter the Least Significant 8 bits are truncated off
This means that if the counter has less than 256 counts it will be stored as 0 in Low Res mode

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