MAINTENANCE
Section 17, Page 9 May 2002
Move back to the Mux field and press
Home
SELECT UP
to display Mux CAL. Put the channel selector
switch on your lid panel to Channel 1. The needle will swing back and forth at a 1 Hz rate. This
was the default frequency selected during turn-on, and you can read it since channel 1 is turned
on and the Cal relay is IN.
To access the timing card fields, press , PREV and the cursor will be on the Freq line.
Press
Home
SELECT UP
or
SELECT DN
End
and notice the change of frequency in the needle movement following
the frequency selected on this menu.
Example using three boards
Suppose you are running a time-domain IP survey at 0.125 Hz with three channels turned on, and
the data for channel 3 looks strange. You want to check to make sure the receiver is working
properly, so get into the Diagnostics program to check out channel 3.
1. From the Main Program Menu press
, TDIP to enter the TDIP Survey Program.
2. Use the default values in the first menu: dipole-dipole survey, synchronous
mode, noisy gains, and quiet environment.
3. Press
Enter
Enter
to get to the Channel Menu and turn on channels 1, 2, and 3.
4. Press
Enter
again to get to the Data Acquisition Menu. Set the frequency to 0.125
Hz, and put the notch filter IN, (for example 60 to turn on the 60 and 180 Hz powerline
notch filters).
5. Press
Enter
to gather one cycle of data. This will just be noise, but it sets the gains and
SP buckout and gives us some numbers to look at in the Diagnostics program. After the
GDP acquires the data, press
Enter
to save the data.
6. Press
to leave the TDIP program and return to the Main Program Menu.
7. Press , Utilities and then press , Diagnostics.
8. The screen should now be similar to Figure 17.2(c):
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