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Grad-601

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30-Apr-2012 03:26 PM

Tom

Tom

Posts: 30

We have added some commonly asked questions with answers for your interest.  Please do not hesitate to ask more.

Tom Simcox
Technical Sales Executive
Bartington Instruments
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11-May-2012 09:39 AM

Tom

Tom

Posts: 30

Q The Grad-601 works for other people but not for me. A Coarse error appears during setup of the equipment.

A It is important that the user is magnetically clean. Make sure to remove all metallic items from your person: watches, mobile phones, jewellery etc. The steel underwire in bras and parts of shoes will also contribute and are often forgotten. Those with metallic implants such as plates, pins or pacemakers may be unable to use the equipment.

To test your magnetic cleanliness set the gradiometer to the 100nT range with the appropriate setting for the number of sensors and run in Scan mode. Hold the gradiometer stationary and check the readings when the operator approaches the gradiometer sensor. The operator should check all parts against the end of a gradiometer sensor until a change of less than 0.1nT is seen.

Tom Simcox
Technical Sales Executive
Bartington Instruments
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01-Aug-2012 06:47 PM

Not Available

Posts: 1

Dear Sirs:

¿Is it possible to orientate the grids no exactly to the north to adapting to the survey area?. I am thinkinhg, for example, in a rotation of 30 degrees to the west (or to the left).

Sorry for my broken english,

 

Regards,

Carlos Otero

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02-Aug-2012 01:03 PM

Tom

Tom

Posts: 30

Dear Carlos

It is possible to orientate your grids in other directions.  Using the main menu on your datalogger select Set parameters and press ENTER. The third item on the list is Start, this is the starting direction of your survey, step through the options and select the direction you wish to start in.  It allows for rotation in 45 degree increments.

With a different starting direction you can orientate your grids accordingly.  I hope this offers you the adaptability you were looking for.

Best regards

Tom Simcox
Technical Sales Executive
Bartington Instruments
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29-Jan-2013 10:35 AM

Tom

Tom

Posts: 30

Q Can the Grad601 be used with GPS data?


A The current way to use the Grad601 alongside GPS is by having the firmware in the data logger adapted to provide an NMEA output.  With this set up the data is streamed out to an external logger which is also connected to a GPS device, the logger would contain software cable of logging both GPS and Grad601 data.  This version is usually used for cart based systems.  Having the NMEA output does means that you cannot use the system in normal grid mode.  


If you are looking to still use the grid system, a simple solution is to take a GPS reading in the starting corner of the grid before your survey so the position is recorded and ensure that the starting direction is correct.  Unfortunately we don’t currently have a set up to combine the standard grid format with GPS data integrated into the readings.

 

Tom Simcox
Technical Sales Executive
Bartington Instruments

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18-Mar-2014 03:34 PM

Tim

Tim

Posts: 13

Q When downloading my data to a computer I get NaN values throughout my survey

A You may be using the wrong version of the download software. When turning on the data logger your firmware version will be displayed on screen.

For versions 6.3 and before you will need to download software version 313.
For version 6.6 you should use software version 316.



Tim Dale
Sales Support Representative
Bartington Instruments

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18-Mar-2014 03:41 PM

Tim

Tim

Posts: 13

Q What is the minimum sensor separation?

A The minimum separation between gradiometer sensors is 3cm; however it is likely that some interference may be picked up if the gap between them is less than 10cm.

 
Tim Dale
Sales Support Representative
Bartington Instruments

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18-Mar-2014 03:44 PM

Tim

Tim

Posts: 13

Q Can I use the Grad-601 in the rain?

A Yes the Grad-601 is waterproof and can be used in the rain, however it is recommended to put a plastic bag over the data logger to limit its exposure to water. The seals around the sensor connectors should also be checked for cracks or holes and repaired using silicon sealant if required.


Tim Dale
Sales Support Representative
Bartington Instruments
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15-Jul-2014 04:56 PM

smc

smc

Posts: 1

Hello,

I am using a grad 601-2 Dual Gradiometer but the sensors are quite old and there is no heading arrow. Instead there are crosshairs & circles on each sensor. Can you please confirm which direction is the heading - i.e. should the crosshairs be facing outward (i.e. in the direction of survey)??

susan
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24-Jul-2014 10:36 AM

Tim

Tim

Posts: 13

Dear Susan,

The cross hair and circle represents an arrow with the cross hairs being the flights. The circle should be pointed in the survey direction as if it were the point of the arrow, with the cross hairs orientated toward the user.


Tim Dale
Sales Support Representative
Bartington Instruments
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25-Jul-2014 10:16 PM

Jeroen

Jeroen

Posts: 1


The Barrington Grad-601 can measure in a range of 100 nT/m to 1000 nT/m. I assume these are not absolute values, but relative (range between minimum and maximum expected value in a survey). How do I know what would be an appropriate range for a survey. E.g. a river plain with clayey sediments with possibly small scale brick ovens or a sands with possible iron works? I the is less pronounced in case of a clayey sand filling in a flood plain consiting of clay and peat sediments? Can anyone explain?
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08-Aug-2014 04:46 PM

Tim

Tim

Posts: 13

Dear Jeroen,

Thank you for posting on the Bartington Forum. You are correct that the ranges are not a measure of the absolute value of the magnetic field, in fact they represent the difference between the background field and the field measured closer to the ground.

The +-100nT range has a better resolution (0.03nT) so it is best to take your survey in this range. If the values are over-ranging because your location has a strong magnetic signature then you also have the possibility of using the +-1000nT range (0.1nT resolution).


Tim Dale
Sales Support Representative
Bartington Instruments
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