Front Panel Operation
3-75
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 follow-
ing explanation on operation is referenced to the operation
model shown in Figure 3-35.
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 Spac-
ing, operation drops down to the scan layer at point A.
Since Scan Trigger Control of the Model 7001 is set
for Source, the scan does not wait at point A for a trigger.
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.
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.
After the relay settles, the Model 7001 outputs a Trig-
ger 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that Bypass is no longer in effect.
A
B
C
D
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.
After the last channel is scanned and measured, oper-
ation 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no longer in effect.
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 op-
eration to drop down to point C, where the first channel is
again closed and eventually measured. As previously ex-
plained, all ten channels are scanned and measured.
After the last channel of the second scan is closed and mea-
sured, the Model 7001 returns to the idle state.
E
F
G
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