Zonge GDP-32 - First Window Time Determination

GDP-32
II
INSTRUCTION MANUAL
October 2002 Section 12, Page 24
12.14 FIRST WINDOW TIME DETERMINATION
0306090120150180210240270µs
0306090120150180210240270µs
0306090120150180210240270µs
dB / dt response First window at 37 µs after
end of turn-off plus delays,
or 150 µs after beginning
of turn-off plus delays
Ideal dB / dt response of receiver
of turn-off reference set
End of turn-off, 74 µs
Beginning of turn-off
Current
Fixed 30 µs
sample width
A
ssume for this example
:
Begin turn-off
Current ramp
39µs 74µs 37µs
Delays Tx turn-off Time to first
End of turn-off
The software is set so that the first window time is always equal to or
greater than one sample width, or in this case greater than 30 µs.
39µs
113µs
132456
Window #
37 67 97 127 157 187 µs
Window times
Antenna delay 15
Fixed sample width = 30 µs
Current turn-off = 74 µs Total delays 39 µs
Filter delay 24
waveform with beginning
Transmitter current
to zero microseconds.
antenna without delays,
over infinitely resistive earth
over conductive
earth, with antenna
and filter delays
full sample width