
Universal Adapter
I-30
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
These low sense voltages make good connections a necessity. All places
to which the Contact Cables are to be attached must be free of paint or
corrosion. Wire brushing the point of connection is advisable.
Connections to a hinge pin or similar device must be avoided. The
crocodile clip grip should not be loose or wobbly. The weight of the
suspended cables must not be supported by the crocodile clips; the
contact cable should be draped around a fixed object which supports the
weight of the cable.
On circuit breakers that have a very violent mechanical operation, a
clamp type connection may be warranted. The crocodile clip is bolted to
a metal tab at the cables’ end and can be removed to facilitate adding
another type of connector to the cables’ end.
Table I.3 lists the voltages used for EHV and OCB channels for the
TDR9000.
AN11: Sampling Rates
The basic concept for digital sampling is that the sampling rate should be
faster than the event that being captured. This sample rate captures the
event. However, if there is a need to determine the actual length of the
event, within 10%, then the sampling rate must be an order of magnitude
faster than the event. To detect and determine the length of bounces of 1
msec, with an accuracy of 10%, a sampling rate of 10 kHz (a sample
every 100
µ
sec) is necessary.
Sampling rates are a prime consideration in the resolution of motion and
velocity. Slower sample rates affect measurements that involve a contact
event and motion subsequent to that contact event. Measurement of
Contact Wipe can be affected by slow sample rates.
Instantaneous velocity measurements from digital travel transducers are
also affected by the sample rate.
Table I.3 TDR9000
™
Contact Sensing Voltages
Low
Ω
High
Ω
None
TDR9000
EHV
7.5V
15V
15V
OCB
15V
48V
15V
Содержание TDR9000
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