Switchbox Measurements; Multiplexer Reset Conditions - Agilent Technologies E1476A User Manual

Switchbox
Measurements
Multiplexer Reset
Conditions
40 Switchbox Applications
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The multiplexer can be configured in switchbox configuration to perform
voltage, 2-wire ohms, 4-wire ohms or temperature measurements via the
internal analog bus. Measurements can be made using switching or
scanning methods.
•
Switching.
switching the channels with &/26H and 23(1 commands.
Individually switching the channels requires that you also close
appropriate tree relay(s) to connect channels to the analog bus.
•
Scanning.
channels. The advantage of scanning is that the appropriate tree
relays are closed automatically when you scan a channel list
with the 6&$1 command and set 6&$1 3257 $%86
NOTE
See "Switching Applications" for examples of measurements using
switching methods. See "Scanning Applications" for examples of
measurements using scanning methods.
At power-on or following the reset of the multiplexer ( 567 command), all
64 channels and the tree relays are open. In addition, after a 567
command, the current scan channel list is invalidated. Table 2-1 lists the
parameters and default values for the functions following turn-on or reset.
Table 2-1. E1476A Default Conditions for Power-on and Reset
Parameter
$50 &281W
75,*JHU 6285FH
,1,7LDWH &217LQXRXV
2873XW> 67$7H@
>5287H @6&$1 02'(
>5287H @6&$1 3257
Channel state
Tree relay state
Channel list from 6&$1
command (after 567)
All measurements can be made by individually
All measurements can be made by scanning a list of
Default
1 Number of scanning cycles is one.
IMM Advances through a scanning list
automatically.
OFF Number of scanning cycles is set
by $50 &281W
OFF Trigger output from EXT, TTL, or
ECL sources is disabled.
NONE Channel list is set for volts
measurement.
NONE Analog bus connections are
disabled from channels.
All 64 channels are open (channels 00 - 63)
All tree relays are open (channels 90 - 94)
Current channel list is invalidated following a
reset of the module with 567 command.
Description
Chapter 2