1502C MTDR Service Manual
3–1
Specifications
The tables in this chapter list the characteristics and features that apply to this
instrument after it has had a warm-up period of at least five minutes.
The Performance Requirement column describes the limits of the Characteristic.
Supplemental Information describes features and typical values or other helpful
information.
Electrical Characteristics
Characteristic Performance Requirement Supplemental Information
Excitation Pulse
Reflected Pulse
v
200 ps (0.096 feet) Vp set to 0.99; 10 to 90%, into a precision short
Aberrations
"
5% peak within 0 to 10 feet after rise
"
0.5% peak beyond 10 feet
Excluding front panel BNC
Jitter
v
0.02 feet (
v
40 ps) p-p Horz scale 0.1 ft/div
v
0.2 feet (
v
400 ps) p-p Horz scale 1 ft/div
Vp set to 0.99, DIST/DIV set to 0.1 ft/div
At 23.4 feet to 46.8 feet, jitter is
v
0.4 feet.
Output Impedance 50
W
nominal While pulse is on, typically
"
2%
Pulse Amplitude 300 mV nominal into 50
W
load
Pulse Width 25
m
s nominal
Pulse Repetition Time 200
m
s nominal
Vertical
Scales
Accuracy
Set Adj
0.5 m
r
/div to 500 m
r
/div,
Within
"
3% of full scale
> 240 values, includes 1, 2, 5 sequences
(accuracy depends on reference level)
Set incident pulse within 3%. Combined with
VERT SCALE control.
Vertical Position Any waveform point is moveable to center
screen
Displayed Noise
"
5 m
r
peak or less, filter set to 1
"
2 m
r
peak or less, filter set to 8
Distance Cursor
Resolution
1/25th of 1 major division
Cursor Readout
Range
Resolution
–2 ft to
w
2,000 ft
0.004 ft
Distance Measurement
Accuracy
1.6 inches or
"
1% of distance measured,
whichever is greater
For cables with Vp = 0.66
For delta mode measurements
Error
v
0.5% for distance
w
27 ft
Error
v
1.0% for distance
w
14 ft
Error
v
2.0% for distance
w
7 ft
Error
v
10% for distance
w
1.5 ft
(continued next page)
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