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Operator Tutorial
2–16
1502C MTDR User Manual
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ac 0.000 ft
return FILTER to desired setting ...
Figure 2–21: VERT SCALE adjusted to Make Pulse Two Divisions High
6. Return NOISE FILTER to the desired setting.
The vertical scale now reads 500 mr/div.
Return-loss measurements at the far end of the cable (or a similar cable in that
bundle) can now be made using normal methods. To make measurements closer
or farther from the instrument requires that you reset the VERT SET REF.
NOTE. Care must be taken in changing the VERT SET REF because of the
calibration change. The 1502C automatically starts the pulse at two divisions
high. When you change the vertical reference, you essentially defeat this
function.
7. To change the VERT SET REF, turn the noise filter back to VERT SET REF
and repeat the preceding procedure.
8. If you wish to totally exit VERT SET REF, do the following:
a. Turn NOISE FILTER to VERT SET REF.
b. Turn VERT SCALE for a pulse two divisions high.
c. Push STORE.
d. Return the NOISE FILTER control to the desired setting.
This function can also be exited by turning the instrument power off and
back on again. The automatic function will adjust the pulse to two divisions
high.