Keithley 707B, Справочное руководство

Страница: 184 / 559

Models 707B and 708B Switching Matrix Reference Manual Section 5: Remote commands
707B-901-01 Rev. A / August 2010 5-23
Relay setup commands
The following table shows DDC commands that refer to Model 707A and 708A relay setups. The
Model 707B or 708B equivalent of relay setups are called scans and patterns.
Scans allow a predetermined set of channels to be closed in a sequential order based on a particular
event or combination of events. For more information, see
Scanning and triggering (on page 3-1).
There are some distinct differences between relay setups and scans:
•
Scans can only be accessed sequentially. Unlike relay setups, you cannot specify an alternate
starting location.
•
You can only retrieve scan lists in string format.
•
You can only append steps to scans — you cannot insert scan steps before steps that are
already in the scan list.
•
You cannot remove scan steps from the scan list.
The correlation to scanning holds true for DDC commands
In
,
En
,
E0
,
Lbbbb
,
Pn
, and
Qn
, while the
DDC commands
Z0,n
,
Zn,0
, and
Zm,n
resemble patterns on the Model 707B or 708B instrument.
Patterns allow several channels to be associated by a name, and any operation that occurs to the
pattern (such as close or open) happens to each channel in the pattern. For more information, see
Channel patterns (on page 2-99).
Scanning trigger
DDC TSP equivalent command Description
En No corresponding command Point to present relay setup
E0
No corresponding command Point to stored relay setup
Lbbbb print(scan.list()) Download setups
Pn No corresponding command Clear relay setup
Qn scan.create("")
Delete setup
Z0,n channel.pattern.snapshot("patternName") Copy present relays to
n
Zn,0 channel.close("patternName")
Copy setup from
n
to relays
Zm,n channel.pattern.setimage(pattern1, pattern2) Copy setup from
m
to
n
In No corresponding command Insert blank setup to mem
Disable or enable the scan event trigger
When enabling external triggering on the Model 707A or 708A instruments, there were two possible
trigger sources, the external trigger line or a GPIB Get command. The Model 707B or 708B has
multiple trigger events that are available to iterate through a scan list. The following table shows that
specifying a scan event trigger automatically enables it. For more information, see Scanning and
triggering.
Scanning trigger
DDC TSP equivalent command Description
F0 scan.trigger.channel.stimulus = 0 Disable scanning trigger
F1 scan.trigger.channel.stimulus = eventID Enable scanning trigger