A-6 Specifications 2400 Series SourceMeter
®
User’s Manual
Source-Delay-Measure (SDM) cycle timing
The following timing information assumes that the SourceMeter is being triggered exter-
nally via the Trigger Link.
For Cases I through IV, it is assumed that the Output Auto-Off feature is enabled
(:SOURce1:CLEar:AUTO ON), and the source setting changes for each triggered SDM
cycle. The discussion is applicable for linear, log, and custom sweeps. It is also applicable
to applications that use the “triggered source” feature (:SOURce1:VOLTage:TRIGger or
SOURce1:CURRent:TRIGger). The discussion is not applicable for memory sweeps
(:SOURce1:MEMory).
For Cases V and VI, it is assumed that the Output Auto-Off feature is disabled
(:SOURce1:CLEar:AUTO OFF), and the source setting remains the same for each trig-
gered SDM cycle. In this configuration, the static source remains on during all SDM
cycles.
Definitions
Trigger latency
Trigger latency is the time from when an external trigger event occurs to when the Source-
Meter takes the appropriate action. It is from when an external trigger is detected in the
Trigger Layer of the trigger model to when the trigger delay begins.
Trigger delay
Trigger delay is the time from when the external event is detected to when the source con-
figuration begins. This is a user-programmable delay that can be set from 0000.0000 sec-
onds to 999.99990 seconds.
Source configuration
This is the time it takes to configure the source DAC. For the following discussion, it is
assumed that the range and polarity do not change when the source value is changed.
Source delay
This is the time between the source configuration and the start of the first A/D conversion.
This programmable delay is typically used to allow the source to settle before starting the
measurement. With Auto-Delay enabled, 100µsec is added to the user-programmed source
delay. The user-programmed delay can be set from 0000.0000 seconds to 9999.99900
seconds.
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