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1.
Press MEMORY, 1, ENTER. (Selects memory location 1.)
2.
Press SOURCE, 5, EXPONENT, 0, ENTER. (Programs
source of memory location 1 to 5V.)
3.
Press I-LIMIT, 1, 0, 0, ENTER. (Programs I-limit of mem-
ory location 1 to 100mA.)
4.
Press DWELL TIME, 5, EXPONENT, 3, ENTER. (Pro-
grams dwell time of memory location 1 to 5msec.)
5.
Press MEMORY, 2, ENTER. (Selects memory location 2.)
6.
Press SOURCE, 0, EXPONENT, 0, ENTER. (Programs
source of memory location 2 to 0V.)
7.
Press I-LIMIT, 1, 0, 0, ENTER. (Programs I-limit of mem-
ory location 2 to 100mA.)
8.
Press DWELL TIME, 5, EXPONENT, +/-, 3, ENTER. (Pro-
grams dwell time of memory location 2 for 5msec.)
9.
Press CONTINUOUS, OPERATE, START/STOP. (Selects
the continuous program mode, outputs the source voltage
and starts the continuous program mode which fabricates
the +5V to 0V 100Hz waveform.)
NOTE
When fabricating output waveforms observe the
response time specifications of the Model 230.
Also, consider the effect of load impedance on the
waveform to be fabricated.
10msec
+5V
0V
Figure 2-3. Square Wave Output Waveform
NOTE
In this example the Model 230 does not change
range. If the Model 230 is programmed to change
from one range into another (e.g. 10V to 1V), the
output drops to zero for approximately 2msec
between range changes.
Example 7 Using External Trigger (Input and Output) — The
external trigger initiates the program mode (single, continu-
ous, or step) in the same manner as the START button. To out-
put any programmed values the program mode must be
selected, the OPERATE button enabled, and the instrument
must receive the external trigger input pulse.
The external trigger output is a pulse signifying the completion
of a programmed dwell time. The pulse is present at the exter-
nal trigger output in any of the three program modes. For the
single or continuous program modes there is an output pulse
at the end of every programmed dwell time. For the step pro-
gram mode, there is an output pulse at the end of the pro-
grammed dwell time for the one memory location. To go on to
the next step (memory location) and output another external
trigger output pulse, another external trigger pulse is required.
Using the Model 619 in conjunction with the Model 230 can
help illustrate this example. Like the Model 230, the Model 619
has external trigger input and output (electrometer complete
and external trigger) lines. Connect the two instruments as
shown in Figure 2-4. In this configuration and with the proper
programming, the Model 230 will output the programmed
voltage when the START button is pressed. At the end of the
specified dwell time the Model 230 outputs the external trigger
pulse. This pulse triggers the Model 619 to take a reading.
When the Model 619 measurement cycle is completed it will
output a trigger pulse (via the electrometer complete line) to
the Model 230. The trigger pulse from the Model 619 to the
Model 230 triggers the Model 230 to advance to the next
memory location and output the next programmed voltage.
The Model 230 must be in the step program mode for this
example.
At this point the cycle repeats itself and keeps on repeating
itself by advancing through the programmed memory loca-
tions of the Model 230. To stop the cycle, disconnect one of
the trigger lines.
The Model 619 can be set to the talk-only mode
and connected to an IEEE compatible printer. The
Model 619 measurement data would then be
recorded by the printer automatically. This would
free the operator from recording the data manually.
Only the Model 619's that have the electrometer
complete and external trigger connections can be
used for this example.
t
MODEL 6194 INPUT
Electrometer
Electrometer
KEITHLEY
6194
KEITHLEY
6194
Module 1
Module 2
MODEL 619 REAR PANEL
MODEL 230
OUTPUT
MODEL 230 REAR PANEL
Figure 2-4. Using External Trigger
NOTE
NOTE
ELECTROMETER
COMPLETE
IEEE Interface
KEITHLEY
6193
EXTERNAL
TRIGGER
EXTERNAL
EXTERNAL
TRIGGER
TRIGGER
OUTPUT
INPUT
IEEE-488 INTERFACE
1
O
A1
A2
A3
A4
DIGITAL I/O
EXTERNAL
TRIGGER
SENSING
LOCAL
INPUT
OUTPUT
REMOTE
LINE RATING
50-60 Hz AC, 80 VA MAX
FUSE
LINE VOLTAGE SELECTED
90-110V
180-220V
105-125V
210-250V
SLOWBLOW
3/4A 90-125V
MADE IN
KEITHLEY
U.S.A.
3/8A 100/250V
2-9
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