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6
CONNECTIONS
Connections to the patterns under test can be made in 2 different methods:
6.1
Cabling for Direct Hard Wiring Between A and Test Specimens
Maximum test and measurement voltage: 300V DC
Connections are made via a 34-way screened Halogen-free ribbon cable terminated with a 34-way IDC
cable-to-cable connector (coloured blue) at one end and bare wires at the other.
The Halogen-free insulation ensures that leaching of contaminant species from the ribbon cable insulation
does not contaminate the conditions within the test chamber.
The cable consists of 16 measurement wires interleaved between 16 grounded wires, also known as guard
bands.
Figure 52
The wires should be separated into pairs (measurement and ground) and the insulation stripped from the
measurement wire at the free end. The stripped measurement wire is then soldered to the appropriate
connection on the test pattern using the approved procedure (e.g. MIL-STD, IPC, IEC, ISO).
If a ground point is available on the test board then the ground wire should be soldered to this.
The process is repeated until all the required connections have been made. It is not necessary that all sixteen
test patterns should be connected on one test board or that they should be in the same test chamber. Each
control board has 16 measurement channels, and each can be connected to a test pattern on a separate test
board if required. It is also not necessary that all 16 channels on any given control board be used