BARTINGTON INSTRUMENTS
Page 17 of 61 OM1800/26
9. Setting Up
The gradiometer must be set up using an automated procedure to help it adjust to the
environment in which it is to be operated. The same procedure also removes alignment errors
and scaling differences between the sensing elements forming the gradient sensor.
This operation is to be carried out over a magnetically quiet area on or near the site to be
surveyed.
Details of the procedure are given in
Checking and Adjusting the Sensors
. A
training video is also
available
.
Note:
After assembly, switch on the Grad601 for a period of at least 15 minutes before
carrying out the setting up procedure. During this warm-up period the instrument must
be left in the environment in which it will be operating. For example, if it will be used in the
sun, let it warm up in the sun rather than in the shade.
Note:
The alignment should be checked at intervals over the course of a day by returning
to the quiet area and measuring the variation in magnetic gradient when rotating the
gradiometer by 180 degrees. The setting up procedure should be repeated as necessary.
Note:
This procedure, which takes only a few minutes, must also be repeated whenever
the sensors are adjusted for height relative to the beam. It will remove any offset error
generated by changes in the position of the battery and other magnetic components
relative to the sensor elements.
10. Keypad Operation and Display
The Grad601 Data Logger DL601 (see Figure 9) has 6 keys to set parameters and control the
operation. A two-line, 20-character display shows the menus, results etc. The functions of the
keys are as follows:
Figure 9: DL601 Data Logger control panel.
