Megger TDR1000/2 Guide De L'utilisateur page 14

Operation
Except where otherwise stated, this specification
applies at an ambient temperature of 20C.
General
Ranges: 10m, 30m, 100m, 300m, 1000m, 3000m
(30ft, 100ft, 300ft, 1000ft, 3000ft, 10000ft)
Accuracy: 1% of range pixel at 0.67VF
[Note- The measurement accuracy is for the
indicated cursor position only and is conditional on
the velocity factor being correct.]
Resolution:
Input Protection:
1% of range.
This instrument complies with
IEC61010-1 for connection to
live systems up to 300V CAT
III. Fused leads must be used
if the voltage between the
terminals exceeds 300V.
Output pulse: 5 volts peak to peak into open
circuit. Pulse widths determined by range and cable
impedance:
25Ω
10m 7ns
30m 20ns
100m 100ns
300m 300ns
1000m 1000ns
3000m 3000ns
Gain: Set for each range with four user
selectable steps.
Velocity Factor: Variable from 0.30 to 0.99
in steps of 0.01
Impedance matching:
Tx Null:
Refresh Rate: Selectable from the menu.Once
per second or three times a second.
Power Down: Automatic after 5 minutes with no
key press.
50Ω 75Ω
7ns 7ns
20ns 20ns
60ns 100ns
120ns 170ns
520ns 680ns
2020ns 2340ns
25, 50, 75, 100
0 to 120
100Ω
7ns
20ns
100ns
300ns
1000ns
3000ns
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