Geometrics, Inc. G-824A Magnetometer Manual
28
simply type ASCII again and hit ENTER. This will take the user to the configuration menu
shown below:
File (Safe default values# (Not saved)
S/N 824113 CM321 configuration Version 00.02
Mag Code Version: 01.00 Build Date: 8/29/2013 @ 18:11:31
A Assign file name B Baud rates C Cycle time
D Display all settings E Erase FLASH F Format of output
G Gate control I Input voltages L Load from FLASH
M Mode of operation N Next (multi systems) O Other devices
P Password R Run magnetometer S Save parameters
T Triggering
This menu controls all of the user adjustable parameters for the G-824A. For our first
example we will set up the magnetometer to output data in ASCII at the 250 Hz rate. We
will output the magnetometer reading in the first column, the Larmor signal level in the
second column and the PPS / Status byte in the third column. In the ASCII output mode, the
G-824 inserts a carriage return and line feed by default. This can also be changed if
required.
7.3.3 SET CYCLE TIME (Data Output Rate)
The first step is to set the rate at which the magnetometer acquires and transmits magnetic
field readings. This is done by setting the time between each cycle, called the cycle time.
For a 250 Hz output data rate, 1/250 = 4 milliseconds, so we enter 0.004. From the G-824A
configuration menu we type C. The G-824A immediately responds with the following:
File (Safe default values# (Not saved)
S/N 824113 CM321 configuration Version 00.02
Mag Code Version: 01.00 Build Date: 8/29/2013 @ 18:11:31
A Assign file name B Baud rates C Cycle time
D Display all settings E Erase FLASH F Format of output
G Gate control I Input voltages L Load from FLASH
M Mode of operation N Next (multi systems) O Other devices
P Password R Run magnetometer S Save parameters
T Triggering
->
The cycle time is set in seconds. For example, if you want
the magnetometer to cycle at a rate of 10 samples per
second (10Hz), set the value to 0.1 seconds.
This setting also controls the anti-alias filter and thus
is still needed when external triggering is used.
It should be set to the rate the trigger pulses are
expected to occur.
Type the letter C at this prompt to edit the cycle time
