Keithley 6517A, Руководство пользователя

Страница: 99 / 343

Front Panel Operation
2-78
NOTE
The front panel TRIG key (see MANU-
AL) is active with the Trigger Link select-
ed, Pressing the TRIG key performs a
device action.
After selecting TRIGLINK as the measurement event, select
one of the following trigger link modes:
• ASYNCHRONOUS — The asynchronous trigger link
mode is used for trigger configurations that require in-
put and output triggers to be routed on separate lines.
After selecting this trigger link mode, you will be
prompted to select an input line and then an output line.
Note that you cannot use the same trigger line for both
input and output.
• SEMI-SYNCHRONOUS — In this mode, the input and
output triggers for the Model 6517A are assigned to the
same line. After selecting this trigger link mode, you
will be prompted to select the trigger line.
TIMER: Use the timer to control the time interval between
measurements. The timer can be set for an interval from
0.001 seconds (1msec) to 999999.999 seconds with 1msec
resolution.
The first measurement occurs immediately, while all subse-
quent measurements occur at the end of the programmed
timer interval. If however, the programmed timer interval is
shorter than the time it takes to complete a single measure-
ment, the next measurement will not start until the previous
one is done.
NOTE
The front panel TRIG key (see MANU-
AL) is active with the time selected. Press-
ing the TRIG key after the completion of a
measurement starts the next measurement
(assuming the Model 6517A is pro-
grammed for another measurement; see
COUNT).
HOLD: When HOLD is selected, the measure source is sup-
pressed. As a result, measuring is stopped and does not con-
tinue until HOLD is cancelled by selecting one of the other
measure source selections. Select HOLD from the SELECT
MEASURE SRC menu by pressing the cursor on HOLD and
pressing ENTER. The instrument returns to the SETUP mea-
sure layer menu.
DELAY
This delay is used to hold up operation in the measure layer.
After the measure event occurs, the instrument waits until the
delay period times out (0 - 999999.999 sec.) before perform-
ing a device action.
COUNT
With this selection, you determine the number (count) of
measurements per scan sequence. The user programmed
count can be smaller, equal to, or larger than the number of
channels in the scan list. For example, if the scan list is made
up of four channels, you can program a count of 12. With this
count value, the instrument repeats the scan three times. An
advantage of repeating channels (rather than scans) is that
delays in the scan layer of operation are avoided. The mea-
sure layer delays among all 12 channels are the same.
INFINITE: Use this selection to continuously repeat mea-
surements (and looping in the measure layer).
ENTER-CHAN-COUNT: With this selection, the user deter-
mines the number of readings per scan. You can program the
Model 6517 to measure up to 99999 times.
CONTROL
Use this menu item to enable or disable the source bypass.
The source bypass is used to bypass the measure event on the
first pass through the measure layer.
SOURCE: With this selection, the source bypass is enabled.
The measure event will be bypassed on the first pass through
the scan layer. This allows operation to proceed to the Delay
and Device Action without having to wait for the pro-
grammed event.
ACCEPTOR: With this selection, the source bypass is dis-
abled.
Configuring scan layer
The scan layer is used for the following operations:
• To select the scanning event (SOURCE) for the instru-
ment.
• To delay operation in the scan layer.
• To designate the number of scan sequences the instru-
ment will perform (COUNT).
• To enable or disable the Source Bypass.
The scan layer is configured from the SCAN item of the AD-
VANCED menu.