20
StarBand
®
Field Service & Maintenance Bulletins
StarBand
®
Field Service & Maintenance Bulletins
©2004-2013,
DC Resistance Check
If zero V DC was measured at the end of the transmit and/or receive IFL cable, a DC
resistance test can be performed to determine if there is an open or a short circuit in the
IFL. Set the multimeter to measure resistance in ohms. Many multimeters can also be
set to provide an audible tone, if the probes are shorted. It is suggested that you use this
setting, if it is available.
At one end of the IFL cable, install a jumper from the center conductor to the outer
conductor shield, as shown in the figures above. At the other end of the IFL, measure
the DC resistance. If there is an open circuit, the multimeter will read
OL
, for
overload, meaning the resistance is too high to measure. If there is a short, the
multimeter will measure a nominal resistance value from the short. An audible tone
will be heard, if the multimeter is set to provide a tone, when a short is measured.
