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E1437A
ASCII Overview and Commands
FILTER:SYNC
Synchronizes the decimation counter.
Command Syntax:
FILTER:SYNC
Description:
This command causes the digital decimation counter to be reset by the next SYNC
line rising transition. Any measurement in progress is terminated and the module is
placed in the idle state. By calling FILTER:SYNC for every E1437 module using a
shared ADC clock, and then calling MEAS:CONTROL to cause a SYNC transition,
the decimation counters will be started at the same time. Once this is done the
decimation counters will stay synchronized as long as the same ADC clock is used. It
is not necessary to resynchronize the decimation counters when the digital filter
bandwidths are changed.
Comments:
If you also want to synchronize frequency or phase, see FREQUENCY:SETUP and
multi-module information .
Example:
The following example shows how to use this command while avoiding potential
conflicts and undefined conditions.
! Force all modules to Idle state
OUTPUT <addrAll>; "MEAS:CONTROL 1,0"
! Hold in IDLE to avoid undesired SYNC release */
! Release forced idle on all modules
OUTPUT <addrAll>;"MEAS:CONTROL 0,0"
!
! Wait for last module Sync/Idle Complete bit 7
REPEAT
OUTPUT <addrAll>;"STATUS?"
ENTER <addrAll>;Oper_status
UNTIL BIT (Oper_status,7)
! Put all modules into filter Sync mode
OUTPUT <addrAll>;"FILTER:SYNC"
!
!Assert & release sync to syncronize all modules
OUTPUT <addrMaster>;"MEAS:CONTROL 0,1"
OUTPUT <addrMaster>;"MEAS:CONTROL 0,0"
!Verify Sync Valid on Master
REPEAT
OUTPUT <addrMaster>;"STATUS?"
ENTER <addrMaster>;Oper_status
UNTIL BIT (Oper_status,7)
!
! Toggle SYNC line to arm all modules
OUTPUT <addrMaster>;"MEAS:CONTROL 0,1"
OUTPUT <addrMaster>;"MEAS:CONTROL 0,0"
!
!Allow trigger
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FILTER:SYNC
command
command
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