October 2002
12. TRANSIENT ELECTROMAGNETICS PROGRAM
12.1 INTRODUCTION.................................................................... 2
12.2 FIXED FUNCTION KEYS ..................................................... 3
12.3 TEM PROGRAM OPERATION ........................................... 4
12.4 POWERLINE NOISE REJECTION ................................... 12
12.5 GATHERING DATA............................................................. 13
12.6 A NOTE ON SCALING ........................................................ 17
12.7 SAMPLE RATES AND ANTIALIAS FILTER DELAYS. 18
12.8 TEM WINDOW CENTERS FOR ZERO DELAY ............ 19
12.9 WINDOW CENTERS AND WIDTHS ................................ 20
12.10 SAMPLE DATA BLOCKS ................................................... 21
12.11 FIELD SETUPS AND MAGNETIC ANTENNAS ............. 22
12.12 ESTIMATING RAMP-OFF TIME...................................... 22
12.13 TEM RECEIVER / TRANSMITTER ARRAYS................ 23
12.14 FIRST WINDOW TIME DETERMINATION................... 24
12.15 FIELD CONFIGURATIONS................................................ 25
TEM RECEIVER SETUP WITH Z-AXIS COIL.................................................25
TEM RECEIVER WITH 3-AXIS (X,Y,Z) COILS ............................................26
ZT-20 ZEROTEM TRANSMITTER SETUP (STANDARD) ...............................27
ZT-20 ZEROTEM TRANSMITTER SETUP (XMT-32)...................................28
HIGH-POWER TEM TRANSMITTER SETUP ..................................................29
12.16 EQUAL-INTERVAL MODE, TEM..................................... 30
12.17 METHOD TO FIELD-CHECK MAGNETIC SENSORS. 32
12.18 THE NANOTEM SYSTEM .................................................. 33
12.19 NANOTEM HOOKUP DIRECTIONS................................ 34
12.20 NT-32 TRANSMITTER SYSTEM....................................... 35
12.21 NANOTEM TURNOFF TIMES........................................... 38
12.22 NANOTEM FIELD DATA CACHE.................................... 38
12.23 NANOTEM WINDOW CENTERS...................................... 41
SAMPLE PERIOD: 1.6 MICROSECONDS ........................................................41
S
AMPLE PERIOD: 1.2 MICROSECONDS ........................................................42
SAMPLE PERIOD: 1.2 MICROSECONDS, SHALLOW APPLICATIONS ..............43
12.24 NANOTEM SAMPLE DATA ............................................... 44
12.25 THE NANOTEM CALIBRATE BOX ................................. 45
NT-20 NANOTEM CALIBRATE SETUP .......................................................46
NT-32 NANOTEM CALIBRATE SETUP .......................................................47
N
ANOTEM CALIBRATOR DECAY TRANSIENT ............................................48
12.26 NANOTEM FIELD SETUP.................................................. 49
NT-20 F
IELD SETUP ...................................................................................49
NT-32 F
IELD SETUP ...................................................................................50
12.27 EQUAL-INTERVAL MODE, NANOTEM......................... 51
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