Doble TDR900 User Guide
72A-2612-01 Rev. A 09/06
6
2.3.1 Safety/Chassis Ground
Grounding of signal cable shields, specimen, and instrument chassis is important to
ensure safety.
Figure 4. Safety Ground
The Safety Ground, also known as the instrument Chassis Ground, shown in Figure 4, is
used to connect the instrument chassis to the ground of the transformer.
2.3.2 Safety Switch + Flag
The safety switch and safety flag allow the software to actually run a test.
2.3.3 Fuses
The TDR900 uses a 3-amp fast blow fuse as indicated on the panel and instrument label.
2.4 Software
Software to control the TDR900 must be run on a PC; the PC is connected to the
TDR900 via a USB cable or an Ethernet cable.
2.5 Overall Test Cable Option (OCB – Dead tank)
This cable option allows for an overall test (also known as an OCB or dead tank test) on a
breaker. This test makes one timing measurement per phase: first break (on and open or
trip) and last make (on a close). The OCB cable is one per breaker spanning all three
phases simultaneously.
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