Operating Instructions
Auto vertical correction on/off
Use this option to force an automatic vertical correction each time an adjustment for
temperature occurs. Typically, the automatic temperature adjustment uses a table
of known values to calculate an appropriate adjustment. This option causes the
table to be ignored and a re-measurement of the vertical correction value. This
option is now obsolete due to new automated temperature correction and will be
removed in future versions.
Force vertical correction
This option forces the CT100 to perform an automatic correction of vertical
measurements immediately. Holding down the AUTOFIT button for one second,
then releasing it provides a shortcut to this option. This option is now obsolete due
to new automated temperature correction and will be removed in future versions.
Envelope Plot
The Envelope Plot system can create captures of transients, min-max envelope traces,
and trace density plots. It has three options.
Envelope Plot On/Off
This menu option enables or disables the feature. When turned on, the CT100
begins capturing trace data and displaying the envelope plot on the screen.
Reset
The reset option clears the captured trace data, clears the plot on the screen, and
begins drawing a new plot.
Fill Mode On/Off
This menu option toggles between fill mode and density plot mode. In fill mode, the
screen is filled in from the lowest value trace up to the highest value trace. This is
useful for finding rare transients and for finding the minimum and maximum
envelope of the trace. In density plot mode, each point on the screen is drawn in a
different color based on how frequently the trace visits that point.
ZTrace
ZTrace transforms a time domain trace from reflection coefficient (millirho) to
impedance (Ohms) in the vertical dimension. This works on saved or live traces.
Legacy Options
This submenu contains features from previous versions of the CT100 software.
Oversample on/off
When oversampling is turned on, the CT100 uses about 1.5 times oversampling
when the horizontal scale is large. Oversampling can assist in finding subtle faults
while using large scales but slows down the frame rate. An indicator appears on-
screen whenever oversampling is turned on.
Oversampling must be turned off while the CT100 is being calibrated.
RRC method
This item toggles between how the relative reflection coefficient is calculated.
Classic: The measurement is related to the input signal at the fault. 1502C: The
Mohr CT100 / CT100HF Operator's Manual 27
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