3. Getting Started
Table 3.4 (Continued) MENU Button and Menus
Menu Selection Purpose/Action
▷ Meas. Settings
▷ ▷ Autoset Vp
▷ ▷ ▷ Autoset Vp with Autofit Set Vp from a cable of known length using Autofit.
▷ ▷ ▷ Autoset Vp from Current
Cursors
Set Vp from a cable of known length using manual
cursor positioning.
▷ ▷ RRC Classic/1502C Mode
(Delta mrho)
Classic: Referenced to amplitude at inactive cursor.
1502C: Referenced to amplitude at test port.
▷ ▷ Vp 3/6 Sig Figs Toggles Vp significant digits from 3 to 6 digits.
▷ ▷ Vert. Units Selects vertical units for a time-domain trace from
reflection coefficient (mρ), impedance (Ω), or voltage
standing wave ratio (VSWR).
▷ ▷ Horiz. Units Toggles through horizontal units (meters, inches, feet,
yards, centimeters).
▷ ▷ Cable Len Adjusts the pulse timing for different length cables.
▷ ▷ Resolution Sets TDR trace horizontal sampling resolution.
▷ Vertical Correction
▷ ▷ Adjust mρ Offset Allows manual vertical measurement offset
adjustments. This lets advanced users manually
calibrate impedance measurements at a particular
location to a known value.
When activated, the M-FUNCTION knob adjusts the
vertical offset. The blue M-FUNC indicator shows the
offset in mρ (millirho).
▷ ▷ Cancel mρ Offset Use this option to cancel a manual mρ (millirho)
correction. Automatic temperature adjustment will
resume autocorrection of the vertical measurements.
▷ ▷ Adjust Ω/(unit) Use the M-FUNCTION knob to change the ohms per
unit distance resistive loss setting until the cable
shows no upward or downward trend across its length.
▷ ▷ Ω/(unit) Correct. On/Off Toggles resistive cable loss correction on/off, 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 Ω/(unit) Pos. Sets the position of the ohms/(unit distance) position
to that of the active cursor.
26 CT100B TDR Cable Analyzers Operator’s Manual
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