Keithley 2001 User Manual

Front Panel Operation
3-79
The BENCH RESET condition arms the Model 2001
and places multimeter operation at point A in the flow-
chart, where it is waiting for a Trigger Link trigger. Note
that since both the arm layer and scan layer are pro-
grammed for Immediate Source, operation immediately
drops down to the measure layer at point A.
Pressing STEP takes the Model 7001 out of the idle
state and places operation at point B in the flowchart.
Since both the arm layer and scan layers are programmed
for Immediate Spacing, operation drops down to the
Channel Layer at point B.
Since Channel Trigger Source is set to Source, the
scan does not wait at point B for a trigger. Instead, it by-
passes “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.
A
B
C
After the relay settles, the Model 7001 pulls down the
Trigger Link trigger line (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Note that Bypass is no longer in effect.
and Remember that the Model 2001 operation is
at point A waiting for a trigger. When the trigger line is
pulled low by the Model 7001, the leading negative-
going edge triggers the Model 2001 to measure DUT #1
(point E). Note that the multimeter holds the trigger line
low. After the measurement is complete, The Model 2001
releases the trigger line (point F) and then loops back to
point A where it waits for another input trigger.
When the Model 2001 releases the trigger line, the leading
positive-going edge triggers the Model 7001 to close the next
channel in the scan. This pulls the trigger line low, triggering
the Model 2001 to measure the next DUT. The process con-
tinues until all ten channels are scanned and measured.
D
E F
Figure 3-39
Operation mode for semi-synchronous Trigger Link example
Idle
Bypass
B
Wait for
Trigger Link
Trigger
Scan
Channel
C
Pull Trigger
Line Low
D
No
Scanned
10
Channels
?
Yes
7001
Make
Measurement
Made
10
Measurements
?
2001Press STEP to start scan
Arm
A
Wait for
Trigger Link
Trigger
E
Release,
Trigger Line
F
No
Yes

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English