Model 2701 User’s Manual Scanning 7-9
Delays
As shown in the trigger models, operation may be subjected to one or more delays before
a channel is measured.
NOTE As previously explained, if the timer control source is selected and its user-set
interval is greater than the user-set Delay, the Timer interval will supersede the
Delay period after the first pass through the loop.
Delay (Auto or Manual) — The user can select either auto delay or manual delay. With
auto delay selected, the instrument automatically selects a delay period that will provide
sufficient settling for function changes, autorange changes, and multi-phase
measurements.
The auto delay period cannot be adjusted by the user. It is a fixed delay for the selected
function and range (Table 8-1).
NOTE When scanning, the auto delay times in Table 8-1 are valid for all control
sources (Immediate, External, Timer, Manual, or Bus).
With manual delay selected, the user can set the delay period from 0 seconds to 99 hours,
99 minutes, 99.999 seconds. However, if you set a delay shorter than the corresponding
auto delay period, measurement uncertainty increases (noisy and/or unsettled readings
may result).
NOTE Keep in mind that if the timer control source is selected, the Delay period is only
in effect for the first pass through the loop.
Ratio/Chan Average Delay — With ratio or channel average enabled, a delay is typically
used to keep the channel relays from cycling too fast. The default delay period is 0.5
seconds but can be set from 0 to 999999.999 seconds using remote programming (see
Section 5 for details). Ratio and channel average are covered in Section 5.
NOTE The Ratio/Chan Average Delay is in addition to the Timer or Delay (Auto or
Manual). That is, it occurs after the Timer interval or Delay period elapses.
Device action
The channel measurement process is performed at this block. If repeat filter is enabled, the
filter process is also performed.
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