Chapter 6 Command Reference 241
SSRC
command allows you to synchronize bursts to an external signal or to a voltage
level on the input signal.
For synchronous ACV or ACDCV (SETACV SYNC command), the SSRC
command allows you to synchronize sampling to an external signal. You can also
use the HOLD parameter to prevent the measurement method from changing to
random should level triggering not occur within certain time limits. The time limits
are determined by the AC bandwidth (ACBAND command) setting.
Syntax SSRC [source][,mode]
source
The source parameter choices are:
* For synchronous ACV or ACDCV, the level triggering voltage (LEVEL command)
and the slope (SLOPE command) are determined automatically and cannot be
specified.
Power-on source = LEVEL
Default source = LEVEL
mode
The mode parameter applies only to synchronous ACV or ACDCV. The choices
are:
* The time limit for synchronous AC or ACDCV is determined by the bandwidth
specified using the ACBAND command.
source
Parameter
Numeric
Query
Equiv. Description
EXT 2 Synchronize to external input on the rear panel
Ext Trig connector
LEVEL * 7 Synchronize to a voltage Level (LEVEL
command> on the input signal using the slope
specified by the SLOPE command.
mode
Parameter
Numeric
Query
Equiv. Description
AUTO 1 For synchronous AC or ACDCV (SETACV SYNC)
using level triggering (default mode), if the input signal
is removed during a reading and does not return within a
certain amount of time, the measurement method
changes to random so that the reading can be completed.
(After the reading, the measurement method returns to
SYNC.)
HOLD 4 The measurement method will not automatically change
from synchronous to random when the input signal is
removed.
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