LDE800 Data Sheet Brochure
User Manual: LDE800-Data-Sheet-Brochure
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LDE 800
Extension for reflectometers
LDE 800
Long distance extension for all
applications where normal reflection
measurements fail
The LDE 800 functions as an add on to reflectometers for
measurements on cables with extreme physical conditions
including excessive lengths, high attenuation and resistance,
very low or high impedance and other difcult-to-overcome
values. Such cables include:
■Long sub-sea cables (power or umbilical)
■Overhead lines
■Heating cables and district heating monitoring
■High attenuation cables
■Large cross section cables
The technology
Instead of using the internal impulse generator of the reflec-
tometer (TDR) the LDE 800 has its own powerful measuring
pulses which are measured by the reflectometer in the pas-
sive transient mode.
■Range extension for reflectometers
■The high impulse voltage minimises the
limitations of distance, resistance and
attenuation on reection measurements
■Distance-dependent amplitude correction
compensates for cable attenuation of any
type
■Adjustable filtering eliminates most
interfeing effects and distortions
■External compensation provides the best
compensation possible
DESCRIPTION
The typical output voltage is 800 V at 50 Ohms impedance.
The unit consists of 4 main modules that can be adapted to
different requirements:
■The module with impedance matching and adjustment to
provide the adaptation to cable parameters from 3 to 400
Ohms.
■The filter module with adjustable high and low pass filter
circuits compensates for inductive effects and external
influences, especially on long cables.
■The impulse generator for output pulses that vary by cable
impedance from 100 to 2200 Volts and pulse widths of
up to 10 ms.
■The amplifier module with adjustable gain and distance
pending amplitude correction.
To simplify its use, the system has a basic default setting for
all parameters. Tuning these defaults will then guide the user
to the best results.
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Seba Dynatronic
Mess- und Ortungstechnik GmbH
Dr.-Herbert-Iann-Str. 6
96148 Baunach
T +49 (0) 9544 680
F +49 (0) 9544 2273
team.dach@megger.de
Hagenuk KMT
Kabelmesstechnik GmbH
Röderaue 41
01471 Radeburg
T +49 (0) 35208 840
F +49 (0) 35208 84249
team.dach@megger.de
CERTIFICATION ISO
Registered to ISO 9001 Cert. no. 000677 QM08
LDE800_DS_EN_V02
www.megger.de
Megger is a registered trademark
GERMANY
Megger GmbH
Obere Zeil 2
D-61440 Oberursel
T +49 6171 92987 0
F +49 6171 92987 19
info@megger.de
SCOPE OF DELIVERY
OPTION
* We reserve the right to make technical changes.
ORDERING INFORMATION
Product Order no.
LDE 800 899005565
Option:
Discharge transformer
■LDE 800 unit
■Set of cables
■Accessory bag
■Discharge transformer (for residual charges and termina-
tion of open ends)
TECHNICAL DATA*
LDE 800
Pulse amplitude @ 50 Ω100 … 800 V in Steps
Pulse width 0,5 ... 10 µs in Steps
Filter 0 ... 12 kV or 0 ... 4 kV
High pass fLL = 6 ... 587 kHz in Steps
Low pass fUL = 16 ... 15.500 kHz in Steps
Adaptation 240 V / 4 Ω, 800 V / 50 Ω,
2.000 V / 400 Ω
Low 33 / 22 / 15 / 10 / 6 / 3 Ω
High 50 / 75 / 100 / 175 / 250 / 400 Ω
Supply 230 V / 50 Hz; others on request
Dimensions (W x H x D) 483 x 295 x 200 mm (19“, 6 HU)
Weight 13 kg
