Operating Instructions
1–22
1502C MTDR Service Manual
HORZ SET REF (
D
mode) allows you to offset the distance reading. For example,
a lead-in cable to a switching network is three feet long and you desire to start the
measurement after the end of the lead-in cable. HORZ SET REF makes it simple.
O
F
F
O
F
F
O
F
F
O
N
ac 0.000 ft
End of
3-ft cable
Figure 1–22: Waveform of Three-Foot Lead-in Cable
1. Turn the NOISE FILTER control to HORZ SET REF. The noise readout on the
LCD will show: set
D
.
2. Turn the
POSITION control to set the cursor where you want to start the
distance reading. This will be the new zero reference point. For a three-foot
lead-in cable, the cursor should be set at 3.00 ft.
O
F
F
O
F
F
O
F
F
O
N
ac 3.000 ft
move cursor to reference and Press STORE
Figure 1–23: Cursor Moved to End of Three-Foot Lead-in Cable
3. Push STORE.
4. Turn the NOISE FILTER control to 1 avg. The instrument is now in HORZ SET
REF, or delta mode. The distance window should now read 0.00 ft. As the cursor
is scrolled down the cable, the distance reading will now be from the new zero
reference point.
Using Horizontal Set
Reference
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