Keithley 486 Instruction Manual page 73

SECTlON 3
Front Panel Operation
1.
2.
3.
Select function (amps or V/I ohms) and range to be
used to
make
measurements. Autorange may be
ning at the first memory location, overwriting
the previously stored data.
used.
- .
Set the trigger mode, interval and delay as follows:
Press SETUP and verify that the multiple trigger A.
B.
C.
D.
mode is selected as follows:
TRIGMODE ~~JLTIPLE
If necessary, use the rotary knob or the 4 and b
keys to display the multiple trigger mode.
Press SETUP and use the rotary knob or the 4
and b keys to display the desired trigger (stor-
age) interval. For example, the following mes-
sage denotes a trigger interval of l/2 second:
TRlG
INTVL 000.500
Press SETUP and use the rotary knob or the4 or
b keys to display the desired trigger delay. If you
do not wish to delay the initial trigger that starts
the storage process, set trigger delay to Osec as
shown:
TRIG DELAY
oo0.000
Exit trigger setup by pressing SHIFI and then
SETUP.
Arm the data store
and
set the buffer size as follows:
NOTE
Details on arming the data store and entering
buffer size parameters are contained in para-
graph 3.8.1.
A.
B.
Press and release MENU until the data store is
selected, and use the rotary knob or the4 and k
keys to display the following
message:
DATA STORE
YES
Press MENU. The currently defined buffer size
will be displayed. For example, if the buffer size
is currently set for 100 readings, the following
message
will be displayed:
BUFFFRSIZ 100 RDGS
Note:Thesizevaluedetermineshowmanyread-
ings wi!J be stored (up to 512) before the storage
cycle stops. However, a buffer size of 000 indi-
cates that the storage cycle will conhue even af-
ter all 512 readings are stored. After the 512th
reading is stored, readings will be stored begin-
4.
5.
C.
D.
Use the rotary knob or the 4 and b keys to dis-
play the desired buffer size value.
Enter the data store parameters by pressing
MENU. The instrument will exit the menu and
will wait for a trigger to start the storage process
as shown in the following example:
-.-----tie
The "*" indicates that the data store is armed and
is waiting for a trigger as denoted by the flashing
TRIGGER indicator.
Press TRIGGER to initiate storage. The instrument
will begin storing data at the programmed interval.
While storage is active, you can be@n to examine
stored readings by entering the data recall mode (see
paragraph 3.11.3).
After all readings have been stored, the displayed
"v' wiIl turn off to indicate that the storage process
has been completed (except for continuous wrap-
around storage).
NOTES:
1.
2.
3.
4.
The data store can be disarmed, even after the stor-
age process has started, by changing a trigger setup;
trigger mode, trigger interval, trigger delay or trig-
ger source. Data storage can also be aborted by re-
arming the data store. The displayed "w' turns off
when the data store is disarmed.
Arming the data store clears the buffer of previously
stored readings.
With the operate trigger source selected (see para-
graph 3.9.4), placing the V-Source of the Model 487
inoperatewilltrigger thestartof thestorageprocess.
The front panel TRIGGER key can be used to start
the storage process with any trigger source selected
(see paragraph 3.9.4).
3.11.2 Triggering One-shot Readings into
Data Store
Reading storage can be controlled by bigger pulses ap-
plied to the rear panel EXTERNAL TRIGGER INMIT
(paragraph 3.10), by using the front panel TRIGGER key,
or by placing the V-Source of the Model 487 in operate. In
a one-shot trigger mode, each trigger stimulus will proc-
ess and store a single reading.
For one-shot operation, the data store is configured the
same
as for multiple trigger operation as explained in the
3-24