8 - Manual setup
Timing options
67
SMU4000 Series Instruction Manual
Timing options
Delay
CNFG >
[Source Measure Action] Manual Setup
>
[Timing] Delay
The Delay defines the measurement delay, also known as the source settling time delay.
This delay provides a time delay between the source being enabled (Run) or changed in terms of
level and the first measurement at this new level being made. Essentially, this provides a settling
time for the source to reach its aiming value and settle.
The delay time can be set between 200us and 5s.
The actual source settling time is dependent upon many factors including mode, slew rate, load,
magnitude of change, polarity change etc. As such, careful consideration needs to be made
when deciding upon the delay. See ‘
’ for more details on source settling times.
To simplify this setting an Auto Delay feature is included. As opposed to defining an exact
settling time delay, the delay can be set to Auto. This automatically delays the first measurement
of the new source level until it appears that the output has settled to the desired level for each
measurement.
This should be the most suitable and the default setting for most applications. However, If
accurate/repeatable timing is required then it is recommended that a fixed delay is set. The auto
delay feature is measurement dependant, as such it can vary from level to level.
The auto delay function can only delay for a maximum of two seconds. This can occur if the
source output exceeds a user defined limit and never reaches the desired source level.
NOTE
When the off condition is set to Open, the relay switching delay is dealt with automatically and
requires no additional measurement delay to cater for the relay switchover. However, a delay
may still be required for allowing the source to settle.
Automatic Settling Delay
Manual Settling Delay