Agilent Technologies L4400 - Manual (Page 155)

L4445A Microwave Switch/Attenuator Driver 7
L4400 User’s Guide 143
100mA continuous + 200mA (15ms pulse, 25% duty cycle)
For example, if the quiescent supply current required for a switch is 50mA
and the switching current is 200mA, the pulse width that activates the
switch must be < 15ms. To prevent an over- current condition, a 45ms
delay is required before the next activation pulse occurs.
Channel Numbering
The L4445A uses the following channel numbering scheme:
1<rem><channel>
where:
rem is the remote module being controlled, and is a single digit in the
range of 1 to 8.
channel is the channel number on the remote module.
The channel number is two digits spanning channels across each remote
module. Channel numbers are shown below (also see the figure on
page 140 ).
The channel numbers are arranged to facilitate the pairing of channels for
dual coil switches and attenuators. Dual coil devices require the use of
two channels, one for each coil. By pairing the upper and lower channels
in each bank, the devices can be controlled using only the lower channel
number. For example, when a paired- coil device is installed on bank 2,
channels 21 and 31 are paired and are controlled using only channel 21.
The following SCPI command closes channel 5 on the master remote
module connected to the L4445A.
ROUT:CLOS (@1105)
You can also use a range of channel numbers. You could close all the
channels on the master remote module connected to a L4445A by sending
the following command.
ROUT:CLOS (@1101:1178)
Note that when single- coil devices are used, the channel numbering is not
consecutive across all 16 channels in a bank.
Bank Channels Channels
Bank 1 1 to 8 11 to 18
Bank 2 21 to 28 31 to 38
Bank 3 41 to 48 51 to 58
Bank 4 61 to 68 71 to 78