Insertion loss
Insertion loss indicates signal lost while passing through the switch. This loss occurs in the
various signal path components through the switch connectors, PC board traces, and relay.
Refer to the specifications located at the front of this manual for Model 7999-4 insertion loss
information.
RFI/EMI
RFI (Radio Frequency Interference) and EMI (Electromagnetic Interference) are general
terms used to describe electromagnetic interference over a wide range of frequencies across the
spectrum. Such interference can be particularly troublesome at low signal levels, but is can also
affect measurements at high levels if the problem is of sufficient severity.
EMI can be caused by steady-state sources such as radio or TV broadcast signals, or some
types of electronic equipment (microprocessors, high speed digital circuits, etc.), or it can
result from impulse sources, as in the case of arcing in high-voltage environments. In either
case, the effect on the desired signal can be considerable if enough of the unwanted signal is
present.
EMI can be minimized in several ways. The most obvious method is to keep the equipment
and signal leads as far away from the RFI source as possible. Shielding the switching switch,
signal leads, sources, and measuring instruments will often reduce RFI to an acceptable level.
In extreme cases, a specially constructed screen room may be required to sufficiently attenuate
the troublesome signal.
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Страница 41: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...