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The blue connectors should be mated to one of the 4/8 blue sockets on the back panel of the Auto-CAF2+
Module.
6.1.1
Bias Connection
The Bias connection should be “daisy chained” to the bias connection on each board and then connected to
the red bias lead supplied and plugged into the Bias 1 socket on the A
The Rear panel of the Bias Power Supply fitted to the A is shown in the photograph below.
Figure 53
EXTV 1
For connection of an external bias. To be used only as a CONDITIONING bias, where there
is a need to apply a different bias voltage to condition than the sampling bias
EXTV 2
For connection of an external bias. Can be used as a sampling bias and a conditioning
bias, where both bias voltages are required to be the same
BIAS 1
For connection of an internal or external bias to the test site
BIAS 2
For connection of an internal or external bias to the test site, only when using the
BELLCORE test program
BIAS 3
For connection of internal or external bias to the test site, only when using the BELLCORE
25 test program
COM
For connection of external bias power supply commons
INTERLOCK
This socket must be connected to the safety interlock switch on the environmental
chamber, or linked out (see Bias Power Supply Connections photograph above)
The test boards are placed in the environmental test chamber with the free ends of the ribbon cable, which
include the IDC (insulation-displacement contact) connectors, and the power cables being fed through to
the outside of the environmental chamber and sealed.
Due to the numerous solder connections required to connect the test coupon to the A the setting
up of a test is a lengthy process and to this end the use of a pre-wired test rack is the quickest and easiest
way to connect test coupons in a fraction of the time. A test coupon employing a 1M
Ω
resistor for each
measurement channel is available for running continuity tests on the rack, which is useful for identifying any
faults in the test rack wiring before a lengthy test is undertaken.
Bias Power Supply
Connections