HP 4145A - Page 36

Model 414.5A
SECTION III
NEXT: Advances the display to the next
page.
Each time this key is
pressed, the instrument checks the
presently displayed page for any
illegal settings, and if it detects
any
errors, it displays the
corresponding error message and
does not advance to the next page,
Qr
automatically changes the
settings.
PREV : Returns the display to the previous
page*
Each time this key is
pressed, the instrument checks the
presently displayed page for any
illegal settings.
3 MEASUREMENT Keys :
These keys start and stop the measurement.
After all measurement conditions have been
set and the GRAPHICS PLOT page, LIST
DISPLAY page, MATRIX DISPLAY page, or
SCHMOO PLOT
Page
is
displayed,
measurement is started by pressing SINGLE,
REPEAT, or APPEND. Measurement can be
stopped by pressing STOP. Measurement is
a sequential operation consisting of voltage
or current sweep, measure-ment, and storage
of the measurement result.
SINGLE: When this key is pressed, results
of the previous measurement are
erased from memory, the new
measurement is made, and the
results are stored in memory.
REPEAT : When this key is pressed,
measurement is repeatedly made
until STOP is pressed. Results
of the previous measurement are
updated during each new mea-
surement.
APPEND : Functions similarly to the
SINGLE key except that results
of the previous measurement are
not erased from memory of the
CRT. Results of a measurement
made using this key are stored in
the remaining unused portion of
memory and are displayed over
(overlay plot) the previous plot.
Measurement can be made using
this key until
“Buffer full” is
displayed.
STOP : Immediately stops the measure-
ments.
@ AUTO SEQ Key:
These keys start and stop the ASP (Auto
Sequence Program) listed on the SETUP
AUTO SEQUENCE
page*
Refer to
paragraph 3-61 for details on Auto Sequence
Programs.
START/STOP : Starts the ASP from line 1.
If pressed during the ASP,
the ASP stops immediately.
Once stopped, the ASP
cannot be continued from
the stop point.
CONT: If the ASP contains a
PAUSE statement, this key
continues the program from
the line immediately follow-
ing the PAUSE statement.
@ INTEG TIME Keys:
These keys are used to select the digital
integration time. When MED or LONG
integration is selected, the integration time
is an integral number of the line frequency
period, eliminating line frequency noise.
SHORT is the initial control setting. The
integration time can be changed at any
time, even during measurement.
SHORT : Measurement data is stored
directly into memory without
integration.
MED :
Integration time is set to one line
frequency period. Sixteen
samples are
taken at each
measurement point.
LONG: Integration time is set to sixteen
line frequency periods. A total of
256 samples are taken at each
measurement point.
Figure 3-2. Front Panel Features (Sheet 2 of 6).
3-3