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Measuring Waveforms
3–138
TDS 500C, TDS 600B, & TDS 700C User Manual
To enable the optical reference receiver (option 3C and 4C) required by some
optical standards that require a Bessel–Thompson response, press MEA-
SURE ➞ Measure (main) ➞ Masks (pop-up) ➞ Mask Options (main). Then
toggle Filter (side) to Enable.
To determine the calibration status of the communication filter, press SHIFT ➞
UTILITY ➞ System (main) ➞ Cal (pop-up). Then read the calibration status
from the Comm Filter menu. If the status is not Pass, refer the oscilloscope to
service personnel for repair or adjustment. The oscilloscope determines the status
at power-up.
To manually align the waveform to a mask, press MEASURE ➞ Mea-
sure (main) ➞ Masks (pop-up) ➞ Time Base Position (main) ➞ Time Base
Position (side) and adjust the general purpose knob or the key pad.
To reset the time base position to 0 s, press MEASURE ➞ Measure (main) ➞
Masks (pop-up) ➞ Time Base Position (main) ➞ Set to 0 s (side).
After selecting a mask, setting mask options, and adjusting the time base
position, you can enable mask counting and see counting results. To enable mask
counting, press MEASURE ➞ Measure (main) ➞ Masks (pop-up) ➞ Mask
Counting (main) ➞ Count Masks (side).
If mask counting is enabled, read the results in the side menus:
H Waveform Count displays the number of waveforms that have contributed
to mask counting.
H Total Hits displays the total of all hits in all masks.
H Mask n Hits displays the number of hits for mask n.
To zero the counts for all masks, press MEASURE ➞ Measure (main) ➞
Masks (pop-up) ➞ Mask Counting (main) ➞ Reset Mask Counting (side).
You may create or edit user masks. If you edit a standard mask, the edited copy
of the mask becomes a user mask. To edit a mask do the following steps:
1. To start with a standard mask, do Selecting a Mask on page 3–136.
2. To select a mask to edit or create, press MEASURE ➞ Measure (main) ➞
Masks (pop-up) ➞ Mask Type (main) ➞ Edit (pop-up) ➞ User Mask
Editing (main). Then select the mask from the side menu.
Adjusting Time Base
Position
Counting Masks
Editing a Mask