Keithley 705 Instruction Manual page 19

Steps 1 through 7 show how to get the Model 705 into a
scanning sequence. The next examples show how to use
the different scan modes, how to daisy chain several Model
705's for an extended number of channels, and scanning
using different scanner cards,
Example 1 Manual Scan-The Model 705 can be program-
med for the step scan mode, if it is desired to scan through the
programmed channels manually. In the step scan mode the
programmed channels can be scanned (closed for the pro-
grammed interval rate and then opened) one channel at a time.
Upon the actuation of the START/STOP button a single chan-
nel will be scanned. For this example, choose the following
parameters:
1. First channel is 1.
2. Last channel is 10.
3. Interval time is two seconds.
4. Number of poles is two.
5. Use the step scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2.
2. Select the appropriate line voltage and turn the Model 705
on. Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete information
refer to paragraph 2.6.7.
4. Press 0, 1, FIRST. (Programs channel 1 as the first channel.)
5. Press 1, 0, LAST. (Programs channel 10 as the last
channel.)
6. Press INTERVAL, 0, 0, 2, 0, 0, 0, ENTER. (Programs the in-
terval time for two seconds.)
7. Press CHANNEL, RESET. (Selects the channel mode for
display and resets to the first channel.)
8. Press the START/STOP button to initiate the step scan
mode.
Upon the actuation of the START/STOP button in step 8,
channel 1 is closed and the START/STOP LED is turned on.
Channel 1 remains closed for two seconds (programmed inter-
val rate) and then opens, The START/STOP LED turns off
and the Model 705 advances to the next channel. To scan the
remaining channels press START/STOP button each time a
channel is to be scanned. When the last programmed channel
is scanned, in this example, it goes through the same pro-
cedure as previously stated. The difference is that after the
channel opens up and turns off the START/STOP LED, the
Model 705 resets to the first programmed channel.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel simply press the RESET button.
Example 2 Single Scan-In the Single Scan mode all the
channels are scanned one time. The Scan runs as follows: the
first channel is closed for the programmed interval rate and
then opened. The Model 705 advances to the next channel,
closes it for the programmed interval rate and then opens the
channel. The sequence is repeated up to and including the pro-
grammed last channel, at this point the Model 705 reverts to
the programmed first channel and stops. Upon the actuation
of the START/STOP button all the programmed channels are
scanned at the programmed interval rate. For this example let
us choose the following parameters:
1. First channel is 3.
2. Last channel is 15.
3. Interval time is 0.5 seconds.
4. Number of poles is 2.
5. Use the single scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2
2. Select appropriate line voltage and turn the Model 705 on.
Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete details refer
to paragraph 2.6.7.
4. Press 0, 3, FIRST. (Programs channel 3 as the first channel.)
5. Press 1, 5, LAST. (Programs channel 15 as the last
channel.)
6. Press INTERVAL, 0, 0, 0, 5, 0, 0, ENTER (Programs the in-
terval time for 0.5 seconds.)
7. Press CHANNEL, RESET. (Turns on the CHANNEL LED,
selects the channel mode for display and resets to the pro-
grammed first channel.)
8. Press SINGLE. (Selects the single scan mode and turns on
the SINGLE LED.)
9. Press the START/STOP button to inititate the single scan
mode.
Upon the actuation of the START/STOP button in step 9,
channel 3 is closed for 0.5 seconds (programmed interval rate
and the START/STOP LED turns on). Channel 3 is opened
and the Model 705 advances to the next channel. Channel 4 is
closed for 0.5 seconds and then opens. The Model 705 then
advances to channel 5 and the cycle repeats itself until the last
channel is scanned (closed for the programmed interval rate
and then opened). At the end of the scan of the last channel,
the Model 705 resets to the programmed first channel and
turns off the START/STOP LED. At this point the single mode
has been completed.
Pressing the START/STOP button during a single scan stops
the scan at the presently displayed channel. The channel re-
mains closed and turns off the START/STOP LED. To start
the scanning sequence from the presently displayed channel
press the START/STOP button.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel simply press the RESET button.
Example 3 Continuous Scan-In the Continuous scan mode
all the programmed channels are scanned continuously. The
scan runs as follows: the first channel is closed for the pro-
grammed interval rate and then opened. The Model 705 then
advances to the next channel, closes it for the programmed in-
terval rate and then opens the channel. The sequence is
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