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Operating Instructions
1–6
1503C MTDR User Manual
A standard instrument defaults to ft/div. A metric instrument (Option 05)
defaults to m/div, but either may be changed temporarily from the menu. The
default can be changed by changing an internal jumper (see 1503C Service
Manual and always refer such changes to qualified service personnel).
6. Vp: The two Velocity of Propagation controls are set according to the
propagation velocity factor of the cable being tested. For example, solid
polyethylene commonly has a Vp of 0.66. Solid polytetraflourethylene (Teflon
) is approximately 0.70. Air is 0.99. The controls are decaded: the left control
is the first digit and the right control is the second digit. For example, with a Vp
of 0.30, the first knob would be set to .3 and the second knob to .00.
7. POWER: Pull for power ON and push in for power OFF. When the front cover
is installed, this switch is automatically pushed OFF.
8. PULSE WIDTH: This is a five-position rotary switch that selects the pulse
width of the cable test signal. The available settings are: 2, 10, 100, 1000
nanoseconds, and AUTO. The selected value is displayed on the LCD adjacent
to the control. The AUTO setting sets the pulse width according to the distance
registered at the right side of the LCD. The selected value is displayed to the left
of this control on the LCD.
9.
n
o
POSITION: This is a continuously rotating control that positions the
displayed waveform vertically, up or down the LCD.
10.
n
o
POSITION: This is a continuously rotating control that moves a vertical
cursor completely across the LCD graticule. In addition, the waveform is also
moved when the cursor reaches the extreme right or left side of the display. A
readout (seven digits maximum) is displayed in the upper right corner of the
LCD, showing the distance from the front panel BNC to the current cursor
location.
11. MENU: This pushbutton provides access to the menus and selects items chosen
from the menus.
12. VIEW INPUT: When pushed momentarily, this button toggles the display of
the waveform acquired at the CABLE connector. This function is useful to stop
displaying a current waveform to avoid confusion when looking at a stored
waveform. This function defaults to ON when the instrument is powered up.
13. VIEW STORE: When pushed momentarily, this button toggles the display of
the stored waveform.
14. VIEW DIFF: When pushed momentarily, this button toggles the display of the
current waveform minus the stored waveform and shows the difference between
them.
15. STORE: When pushed momentarily, the waveform currently displayed will be
stored in the instrument memory. If a waveform is already stored, pushing this
Vp
.3
.4
.5
.6
.7
.8
.9
.00
.01
.02
.03
.04
.05
.06
.07
.08
.09
POWER
(PULL ON)
PULSE WIDTH
POSITION
n
o
POSITION
n
o
MENU
VIEW
INPUT
VIEW
STORE
VIEW
DIFF
STORE
Summary of Contents for 1503C
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Page 92: ...Appendix A Specifications A 6 1503C MTDR User Manual...
Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
Page 122: ...Glossary Glossary 6 1503C MTDR User Manual...
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