Operating Instructions
3) Position the active cursor at the left most 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 CT100 for calibration
purposes. Attach these terminators to the CT100 when prompted to do so. (For the
CT100, CT100-AC-IBMM is used to open the shorting BNC.) For the short condition,
shorting caps are provided for both the CT100 with a shorting BNC and the CT100 with
SMA connections.
When the reference measurement is finished, cursor measurements will now appear in
blue, and a line saying using vert. ref. will appear underneath.
A green line will appear under 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 millirho is taken to be 50 Ohms. This value can be
changed with the Vert. Ref. Center Imp. menu option.
The CT100 is now configured for impedance measurements better than 2% across a wide
range of impedances.
The menu option at the top of the right hand side can be used to toggle the vertical
reference on and off as needed for a given cable length setting.
Cable resistance correction
The CT100 also has a system for correcting for resistance in cables.
Under the Measurement menu, there is an item to set Ohms per unit length and another
item to toggle the correction on and off. The calculations of this feature assume a linear
serial resistance to an attached cable and no other loss. Use with caution.
1) From the Main menu, go to the Measurement menu.
2) Select Vertical Correction. The Vertical Correction menu will appear.
3) Select Adjust Ohms/m.
4) Select Ohms/m correct off to turn on the correction. The first time you turn on the
correction, the end point will also be moved to the location of the active cursor.
Subsequently, the end point of the correction can be moved by choosing the Set
Ohms/m position menu option.
5) Use the CURSOR button to switch to the other cursor.
Mohr CT100 / CT100HF Operator's Manual 51
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