User`s guide

Microwave Switch/Attenuator Driver 8

34980A User’s Guide 211

Power Supplies

The switches and attenuators on the first remote module may be powered

from the 34980A or use an external power supply. All additional remote

modules must use an external power supply.

Each remote module has a terminal strip used to connect external switch

power. The three most common power supply voltages used by the

microwave switches and attenuators are:

• 5 Volts

• 15 Volts

• 24 Volts (most common)

Power Consumption

Each 34945EXT can drive up to 6A continuously using an external power

supply. The actual amount of power available for the switches on each

34945EXT module varies with the type of switches being used and the

settings for those switches.

• Some switch types consume power even in their quiescent state.

Be sure to review the switch data sheets for the switches you are using.

• Set the pulse width to the minimum necessary to activate the switch

using the

ROUTe:CHANnel:DRIVe:PULSe:WIDTh command.

• Add power supply recovery time using the

ROUTe:CHANnel:DRIVe:TIMe:RECovery command

• Use an external power supply if possible.

• When the drive source for the master remote module is set to internal,

each driver interface module may supply up to 6A.

GND

EXTERNAL

POWER INPUT

30 VCD MAX