5.8 Load coils
Load coil are used on telephone lines to increase the line inductance, so improving the transmission
characteristics of long lines. TDR generally will not test pass load coil so the inductive load coils appear
as open circuits to the cable fault locator, so the upward reflection will be displayed as Fig 8.
Fig. 8
6. Specification
6.1 Technical specification
Measure Range:
100, 300, 1000, 3000m and Auto range
Accuracy:
0.9% of Range
Resolution:
1% of range
Gain:
Auto Set across screen
Output Pulse:
5V nominal in open circuit
PVF:
Variable from 0.01 to 0.99
Output impedance:
120 Ohm
Pulse Width:
Automatically varied
Connectors:
Two 4mm safety terminals
LCD Display:
128x64 graphic LCD with backlight
Update Rate:
Once per second
No touch shutdown:
5 minutes
Display view area:
44x62 mm
Power supply:
Batteries 6 AA alkaline or nickel- cadmium cells
Battery Low indicator:
6.5V nominal
6.2 Environment
Operating temp:
-20 to +60’C
Storage temp:
-30 to +70’C
Humidity:
93%
6.3 Physical
Case Dimensions:
210 X 100 X 50 mm
Case Material:
Fiberglass Nylon 6/6
Weight:
550g (with batteries)
Leads:
2 metres safety plug and Alligator clip
7.
8.
