4. Operating Instructions
2. Press the FILE button. The File menu appears.
3. Press the Masks option to enter into the Masks menu.
4. Select the Load/Save Mask option. A scroll dialog appears, showing all saved masks.
5. Use the M-FUNCTION knob to highlight the mask you wish to export.
6. Press the Export → USB option.
7. The mask will be copied to the USB drive.
To import a mask to the CT100B, do the following:
1. Insert the USB drive with the mask into the front panel port of the CT100B.
2. Press the FILE button. The File menu appears.
3. Press the Masks option to enter into the Masks menu.
4. Select the Load/Save Mask option. A scroll dialog appears, showing all saved masks.
5. Use the M-FUNCTION knob to highlight BROWSE USB.
6. Press the Select option. This will navigate to the attached USB drive.
7. Use the M-FUNCTION knob to highlight the mask to be imported.
8. Press the Import → Internal option.
9. The mask will be copied to internal storage of the CT100B.
4.11.5. Deleting a Mask
Once masks are backed up to a computer, they can be deleted from the CT100B as follows:
1. Press the FILE button to open the File menu.
2. Press the Masks option to enter into the Masks menu.
3. Select the Load/Save Mask option. A scroll dialog appears, showing all saved masks.
4. Mark specific masks for deletion using the Toggle Selected option or select them all with the
Mark All option.
5. Select the Delete option. You will have to confirm the deletion.
4.12. Envelope Plot (Transient/Intermittent Fault Detection)
Cable system troubleshooting frequently involves detecting and localizing transient or intermittent
faults, such as a twisted-pair cable with frayed insulation that briefly shorts its conductors when
mechanically disturbed, or a coaxial connector that reflects an open when shaken. The CT100B’s
Envelope Plot mode simplifies characterization of these types of intermittent faults. There are two
ways to create an Envelope Plot.
Using the Special Main menu:
1. Position the TDR trace such that the area of interest is located on the screen at a satisfactory
horizontal and vertical scale. Resolution from previous measurement will be preserved.
2. Select MENU → Intermittent. Intermittent will toggle the Envelope Plot on and off. Note:
This menu option does not access the other Envelope Plot features described below.
Using the Envelope Plot menu:
1. Position the TDR trace such that the area of interest is located on the screen at a satisfactory
horizontal and vertical scale. Resolution from previous measurement will be preserved.
68 CT100B TDR Cable Analyzers Operator’s Manual
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