Keithley 2001 Operator's Manual page 107

* Indicates that the setting is the BENCH RESET (and
factory) default condition.
Model 7001:
Idle state:
Reset = :INIT:CONT
Scan list = 1!1-1!10,
Arm layer:
Arm spacing = Immediate*
Arm count = 1*
Arm trigger control = Acceptor*
Scan layer:
Scan spacing = TrigLink
Trigger link mode = Asynchronous
Input line = #2
Output line = #1
Number of scans = 2
Scan trigger control = Source
Channel layer:
Channel spacing = TrigLink
Trigger link mode = Asynchronous
Input line = #4
Output line = #3
Number of channels = 20
Channel trigger control = Source*
* Indicates that the setting is the RESET (and factory)
default condition.
Notice that the Model 2001 is reset to BENCH defaults. With
this selection, the multimeter stays armed. Since the arm
source and scan source are set to Immediate, the Model 2001
waits in the measure layer for a trigger.
To run the test and store the readings in the Model 2001,
press STORE on the multimeter, enter the desired number of
readings (20), and press ENTER. The Model 2001 waits
(with the asterisk annunciator lit) for a Trigger Link trigger
from the Model 7001.
Press STEP on the Model 7001 to start the scan. The
following explanation on operation is referenced to the
operation model shown in
A
Pressing STEP on the Model 7001 takes it out of the idle
state and places operation at point A in the flowchart. Since
the arm layer is programmed for Immediate Spacing,
operation drops down to the scan layer at point A.
B
Since Scan Trigger Control of the Model 7001 is set for
Source, the scan does not wait at point A for a trigger.
2001-900-01 Rev. K/ August 2010
OFF*
Figure 3-35.
Instead, it bypasses "Wait for Trigger Link Trigger" and
proceeds to point B. Note that this Bypass is in effect only on
the first pass through the model.
C
Since Channel Trigger Source of the Model 7001 is also
set to Source, the scan does not wait at point B for a trigger.
Instead, it bypasses "Wait for Trigger Link Trigger" and
closes the first channel (point C). Note that the Bypass is in
effect only on the first pass through the model.
D
After the relay settles, the Model 7001 outputs a Trigger
Link trigger pulse (point D). Since the instrument is
programmed to scan ten channels, operation loops back up to
point B, where it waits for an input trigger. Note that Bypass
is no longer in effect.
E
The trigger pulse from the Model 7001 triggers the
Model 2001 to make a measurement of DUT #1. After the
measurement is complete, the multimeter outputs a Trigger
Link trigger pulse (point E).
The trigger applied to the Model 7001 from the Model 2001
closes the next channel in the scan, which in turn triggers the
multimeter to measure the next DUT. This process continues
until all ten channels are scanned and measured.
F
After the last channel is scanned and measured,
operation proceeds to point F, where the Model 7001 outputs
a trigger pulse. Since the Model 7001 is programmed to
perform two scans, its operation loops back up to point A,
where it waits for an input trigger. Note that Bypass is no
longer in effect.
G
The trigger pulse from the Model 7001 triggers the
Model 230 to output the next programmed voltage level.
After the voltage level is set, the Model 230 outputs a trigger
pulse (point G).
The trigger pulse applied to the Model 7001 from the Model
230 places operation at point B. The Bypass is again in effect
because this is the beginning of a new scan. This allows
operation to drop down to point C, where the first channel is
again closed and eventually measured. As previously
explained, all ten channels are scanned and measured.
After the last channel of the second scan is closed and
measured, the Model 7001 returns to the idle state.
Front Panel Operation
3-75