Page
42
of
42
8
HIGH VOLTAGE TESTING - CLR1250 BRIDGE
A CLR1250 Bridge
This assembly provides a "bridge" between the A measurement instrument and the Test
Specimens (also known as Test Coupons) permitting tests to be conducted at 1250Vdc.
The input voltage to the A instrument is a maximum of 500Vdc.
The CLR1250 Bridge comprises:
1 Cable Interface
a)
The Cable Interface between the A measurement instrument includes 16 x 1m cables
rated at 300V
b)
Each cable is fitted with a connector suitable for direct fitting to the A
c)
The other end of this cable is fitted with a "socket" to connect with a "plug" on the Bridge Box
2 Bridge Box
a)
2x 128 channel bridge boxes to provide a 256-channel measurement capability
b)
There are 8 "plug" connectors to receive the Cable Interface as referenced in item 1
c)
Output voltage rating = 300V
d)
The opposite side of the Bridge Box has 8 "plug" connectors to receive the Coupon Connecting
Cable
e)
Input voltage rating = 1250V
f)
The design is fully compliant with EU Low Voltage and Safety Regulations
g)
The design is such that if anyone inadvertently unplugged either the input socket (1250V) or the
output socket (300V), there is no risk to the operator safety from the Bridge Box
3 Coupon Connecting Cable
a)
In compliance with system integrity, performance and IPC SIR, ECM, & CAF Standards it should
be noted that only hard wiring of the Test Specimen / Coupon is permitted
b)
There is no present acceptance for the use of a test rack and, to date, we have not yet identified
any suitable connectors that are rated for 1250V at 85%RH/85°C conditions for 1000hours
c)
The Coupon Connecting Cable we have opted to employ is a PTFE dielectric coated coaxial
cable rated at 1250V with an FEP jacket
d)
This cable is only warranted for 1x 1000hour, 1250V test at 85%RH/85°C
e)
Care should be taken to solder the coaxial Coupon Connecting Cable to the test coupon, as in
compliance with both IPC and IEC test methods, fluxless solder wire should be used
4 Alternative Coupon Connecting Cable
a)
Gen3 continue to research alternative cabling solutions and will issue the updated advisory
notes when we have these available for use
b)
Ordinary single strand, unshielded cabling should NOT be used, as this will be prone to EM
interference
c)
If using cabling not supplied by Gen3 specifically for use with the CLR1250 Bridge, care must be
taken to ensure the avoidance of EM interference