Low Frequency Multiplexer Switch Modules 4
34980A User’s Guide 139
Lifetime of relays is severely degraded as current or voltage goes up.
If higher voltage is being switched, limits on source current are
recommended.
When the power is off, all channel and Analog Bus relays open.
CAUTION
Because user-attached reactive loads and backplane parasitic
capacitance may result in high in-rush currents, 100
Ω in-rush
resistors protect the reed relays from damage and performance
degradation. Therefore, you must consider these resistors when
you are designing a measurement. Refer to the simplified
schematics on page 140 and page143.
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