4. Operating Instructions
4. Press the Select button to load the screenshot.
5. After the screenshot has loaded, pressing the OK or Cancel button will remove the
screenshot from the screen.
Screenshots can also be exported to a USB drive for storage or to transfer to CT Viewer 2 or
another CT100B. To export one or more screenshots:
1. Insert a USB drive into the front panel port of the CT100B.
2. Go to MENU → Measurement → Envelope Plot.
3. Make sure Envelope Plot is toggled to Off.
4. Select View Saved.
5. Use the M-FUNCTION knob to scroll through the list of screenshots. Mark specific
screenshots for transfer using the Toggle Selected option or select them all with the Mark All
option.
6. Press the Export → USB menu option. Press OK to confirm the export. A message should
appear after a short time confirming that screenshots were transferred.
The screenshots will be saved on the USB as an .env file, which can be opened by CT Viewer 2 or
viewed with any program that can display .bmp files.
4.13. Improving Measurements
4.13.1. Vertical Reference (Vert. Ref.) Calibration
Use the vertical reference (Vert. Ref.) system to increase the accuracy of vertical measurements,
including impedance, reflection coefficient, and return loss. The Vert. Ref. feature can be used with
a direct connection, through impedance matching adapters, and using baluns. To calibrate with
the Vert. Ref. feature, use the following procedure:
1. Go to the MENU → Measurement menu.
2. Select the option for Vert. Ref. to display the Vert. Ref. menu.
3. Position the active cursor at the leftmost position where the Vert. Ref. should apply.
Typically, this will be the position where you will apply the open and short attachments in
step five. This position can be changed after the setup.
4. Select the Set Vert. Ref option.
5. A set of terminators, both open and short, are included with the CT100B for calibration
purposes. Attach these terminators to the CT100B when prompted to do so (pn:
CT100-AC-ISS, CT100-AC-ISMM, CT100-AC-IBS, CT100-AC-IBMM).
When the reference measurement is finished, cursor measurements will now appear in blue at the
right side of the screen, and the notification using vert. ref. will appear underneath.
A green line will appear at the position of the active cursor (see step 3 above). Vertical reference is
applied to all points to the right of the green line. Standard vertical measurements are used for all
points to the left of the green line. The position of this line can be changed with the Vert. Ref
Start menu option.
By default, the impedance value at 0 mρ (millirho) is taken to be 50 Ω. This value can be changed
with the Vert. Ref. Center Imp. menu option. If you are using an impedance matcher or balun
adapter, the center impedance should be changed to the value of the impedance of the adapter. For
CT100B TDR Cable Analyzers Operator’s Manual 71
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