Operating Instructions
1–8
1502C MTDR Service Manual
2. Help with Instrument Controls explains the operation of each control. When
a control or switch is adjusted or pushed, a brief explanation appears on the
LCD.
3. Cable Information has these choices:
a. Help with Cables gives a brief explanation of cable parameters.
b. Velocity of Propagation Values displays a table of common dielectrics and
their Vp values. These are nominal values. The manufacturer’s listed
specifications should be used whenever possible.
c. Impedance Values displays impedances of common cables. In some cases,
these values have been rounded off. Manufacturer’s specifications should
be checked for precise values.
d. Finding Unknown Vp Values describes a procedure for finding an
unknown Vp.
4. Setup Menu controls the manner in which the instrument obtains and displays
its test results.
a. Acquisition Control Menu has these choices:
i. Max Hold Is: On/Off. Turn Max Hold on by pushing MENU then
STORE. In this mode, waveforms are accumulated on the display. Max
Hold can be deactivated by pushing STORE or the mode exited by
using the Setup Menu.
ii. Pulse Is: On/Off. Turns the pulse generator off so the 1502C does not
send out pulses.
iii. Single Sweep Is: On/Off. This function is much like a still camera; it
will acquire one waveform and hold it.
b. Ohms-at-Cursor is: On/Off. When activated, the impedance at thee point
of the cursor is displayed beneath the distance window on the display.
c. Vertical Scale Is: dB/m
r
. This offers you a choice as to how the vertical
gain of the instrument is displayed. You may choose decibels or millirho.
When powered down, the instrument will default to millirho when powered
back up.
d. Distance/Div Is: ft/m. Offers you a choice of how the horizontal scale is
displayed. You may choose from feet per division or meters per division.
When powered up, the instrument will default to feet unless the internal
jumper has been moved to the meters position. Instructions on changing this
default are contained in the 1502C Service Manual.
e. Light Is: On/Off. This control turns the electroluminescent backlight
behind the LCD on or off.
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