Section 3: Instrument description
Series 3700A System Switch/Multimeter Reference Manual
3-46
3700AS-901-01 Rev. D/June 2018
Selecting measurement triggers
You can also select the trigger to use to take a measurement for each scan step.
Immediate
: When immediate is selected, the measurement is taken as soon as the channel is
closed. This is the default setting.
Digital Input
: When selected, you select a digital line (1 to 14) that triggers the instrument to take a
measurement. You can select falling or rising for the digital input. Falling selects the falling edge
trigger. Rising selects the rising edge of the trigger.
Every N seconds
: This parameter adds a fixed delay after the channel is closed and before the
measurement is taken.
Advanced triggering
The Advanced Trigger tab of the Scan Builder allows you to set the options that are available from the
Simple Trigger tab, as well as more sophisticated options to control scan triggering.
The Advanced Trigger tab uses the trigger model flowchart to help you visualize and define the input
and output triggers to the scan.
For more information on the trigger model, see
(on page 5-24).
The options on the Advanced Trigger tab include:
•
Mode
: Select Open All to open all slots before the scan starts. Select Open Selective to open
only channels that are involved in scanning; closed channels that are not involved in scanning
remain closed. Select Fixed ABR to open all channels involved in the scan, but close all required
backplane relays before the scan.
•
Arm (Scan Start) Stimulus
: Select the event that causes the arm event detector trigger to be set
to the detected state (the scan can begin).
•
Measure Stimulus
: Select the event that causes the measurement event detector to be set to
the detected state (the measurement can begin).
•
Measure Complete Event To:
Select the recipient of the Measurement Complete Event.
•
Channel Ready Event To
: Select the recipient of the Channel Ready Event.
•
Scan Complete Event To
: Select the recipient of the Scan Complete Event.
There is also a
Config
button available for each of the options except Mode. When you click this
button, a dialog box with additional options for the selection is displayed.
Set the scan mode
The scan mode determines how channels are opened before the start of the scan.
You can select:
•
Open all:
All slots are opened.
•
Open select:
All channels selected in the scan list are opened; any closed channels remain
closed if they are not in the scan list.
•
Fixed ABR
: All necessary backplane relays are closed before the scan.
To set the scan mode from the web interface:
1. Select the
Advanced Trigger
tab.
2. Select
Mode
.
3. Select
Fixed ABR
,
Open All
or
Open Selective
.
