H Heuer Instruments UMDT51A, User Manual

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LT51 User Manual xi
Distortion (THD, S/N, S/ND, SFR) ....................................................... 44
Distortion (Spectrum measurements) .................................................. 44
Distortion (Numerical measurements) .................................................. 47
Return Loss ......................................................................................... 48
Near End X-Talk (NEXT) / Loss ........................................................... 49
DC / AC Voltage................................................................................... 51
Loop Current ........................................................................................ 52
AC Impedance (MAGZ) ....................................................................... 53
Automatic testing ................................................................................. 54
Self-Test .............................................................................................. 56
Double Ended Loss.............................................................................. 58
Far End X-Talk (FEXT) ........................................................................ 59
TDR Measurement............................................................................... 60
Auto-TDR ..................................................................................... 60
Zo Impedance .............................................................................. 60
TDR Range .................................................................................. 60
PVF (Propagation Velocity Factor) .............................................. 60
Cable ........................................................................................... 61
Pulse width .................................................................................. 62
Adjusting the TDR display ........................................................... 62
Cursor .......................................................................................... 62
Vertical zoom ............................................................................... 62
Horizontal zoom ........................................................................... 63
Horizontal offset ........................................................................... 63
Vertical offset ............................................................................... 63
‘Peak’ Events ............................................................................... 64
‘Dip’ Events .................................................................................. 65
Blind spot ..................................................................................... 65
Saving measurements ......................................................................... 66
Recalling saved measurements ........................................................... 67
Recorder Mode .................................................................................... 68
7. PC interface ........................................................................................ 69
USB drivers .......................................................................................... 69
LT51View application program ............................................................ 70
Up-loading saved measurements ........................................................ 70
Up-loading Recorder results ................................................................ 70
Controlling the LT51 ............................................................................. 71
LT51 Commands ......................................................................... 72
Updating LT51 firmware ....................................................................... 76
8. Adjustment procedures ..................................................................... 77
Required test equipment ...................................................................... 77
TX Level ............................................................................................... 78
DC Voltage .......................................................................................... 79
Frequency (TX and RX accuracy) ........................................................ 80
Bridge O/C ........................................................................................... 80