Operating Instructions
option to get accurate impedance measurements when using an impedance
matcher.
Vert. ref. start
Set the start of the vertical reference to the cursor position. The green line that
marks the beginning of the vertical reference will be moved to under the active
cursor.
Vertical Corrections menu
This menu contains options for adjusting or correcting vertical measurement.
Adjust Ohms/(unit distance)
This tool can be useful when examining long cables. Select this option to make the
M-FUNCTION
knob change the Ohms-per-unit distance loss setting for a cable.
When activated, the Ohms-per-unit distance tool will correct for resistive loss down
the length of the cable. The correction always extends from 0 distance to a position
that can be fixed using other menu commands below. When activated, the end
position will be displayed on the screen in a distinctively colored vertical line. This
correction requires accurate Vp measurements and accurate vertical measurements.
It is therefore best used in conjunction with a vertical reference (see above).
This tool may also be used to estimate resistive loss in a cable by adjusting the
value until the cable shows no upward or downward trend across its length.
Ohms/(unit distance) correct on/off
Toggle the application of the Ohms per meter correction, as described above. If the
end point of the correction has not been set, then it will be set to the position of the
active cursor.
Set Ohms/(unit distance) position
Set the position of the Ohms/(unit distance) position to that of the active cursor.
Adjust rho offset
When activated, the adjust rho offset option will change the
M-FUNCTION
knob to
adjust the vertical offset. The blue M-FUNC indicator at the top of the screen will
also change to show that the units are now in millirho. Turning the
M-FUNCTION
knob will directly change the vertical measurements at the cursor. Advanced
operators can use the
M-FUNCTION
knob to manually set vertical measurements to
a known value. The adjusted value is never saved; restarting the CT100 will cancel
the adjustment. When this correction is in use, automatic temperature adjustment
will not correct vertical readings. A message that rho measurements are being
manually adjusted will appear near on-screen measurements. Changing the rho
values will change all vertical measurements including impedance, return loss,
voltage, standing wave ratio (VSWR), and relative reflection coefficient (RRC).
Cancel rho offset
Use this option to cancel a manual rho correction. Automatic temperature
adjustment will resume auto-correction of the vertical measurements.
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Mohr CT100 / CT100HF Operator's Manual