TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 3-21
Monday, November 26, 2001 1:09 pm
Event
The Event module is split into two parts:
• Analog channels
• Auxiliary contact channels
Analog Channels
The analog part of the Event module has three general purpose analog
inputs for use in monitoring voltages or currents. These inputs are
individually configurable via the software to read inputs from current
shunts and probes, as well as voltages. Analog inputs are converted by a
high speed 12-bit analog-to-digital converter and then recorded at the
Instrument 10 kHz sample rate.
N
OTE
For applications where a current probe is used, a probe zeroing process
must be completed. Refer to ”Current Probes” on page 4-34.
Auxiliary Contact
Channels
The Auxiliary Contact portion of the Event module monitors the state of
up to three sets of auxiliary contacts.
These contact circuits ascertain whether a contact is:
• Open or closed
• If open, wet or dry, regardless of the polarity of the
excitation voltage
The TDR9000 has an automatic wetting circuit that wets a dry contact,
which allows the open/closed state of the circuit to be determined.
This module comes with three analog and three auxiliary contact
channels. For the present, this module can be used in Locations 1
through 5.
N
OTE
Ensure that the physical connections completed on the Physical Front
Panel reflect the numbering order of the Event module.
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