SRS Labs SR430, Manual

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18
Guide To Operation
The Right most displayed bin and time is the X
value of the right edge of the graph. These values
represent the X scale and translation. The X scale
is (Right-Left)/10 per division. The horizontal scale
ranges from 16 bins to N bins across the graph.
The actual position of the displayed data within the
record is given by the Left and Right values. Bin
#0 is the first bin in the record and Bin #N-1 is the
last bin where N is the programmed number of
bins per record. The Left and Right values mark
the region of the record displayed on the graph.
The graph may be horizontally translated in incre-
ments of 1/100 of the screen or 1 bin, whichever is
larger.
The Vertical scale is the number of accumulated
counts per division displayed on the graph. This
value is changed whenever the vertical scale is
adjusted. The vertical scale ranges from 1 to 5000
counts per division. The Minimum displayed Y
value corresponds to the Y value of the bottom
edge of the graph. This value is changed whenev-
er the graph is translated up or down. The graph
may be translated in the vertical direction in incre-
ments of 1/80 of the screen or 1 count, whichever
is larger.
The Number of Records accumulated is dis-
played in the bottom right corner. While data is be-
ing acquired and accumulated, the graph is being
constantly updated to display the data accumulat-
ed so far. Each time the data is updated, the num-
ber of records is updated. When the scan is com-
plete, the graph will show the total accumulated
data and the number of records accumulated will
be equal to the programmed number of records
per scan. While data acquisition is in progress, the
graph shows the data accumulated and the num-
ber of records completed.
CURSOR DISPLAY
The Cursor Region is the graph region between
the vertical dashed lines. The cursor region may
be set to 1 division (wide), 1/2 division (norm), or a
single vertical line (spot). The cursor region does
not change with horizontal scaling. The Cursor
Marker is a small square which seeks the mini-
mum, maximum, or mean of the data within the
cursor region. When seeking min or max, the cur-
sor marker is located at the position of the data
point which is the min or max. This allows peaks
and valleys in the data to be easily read out. When
seeking the mean, the X position of the cursor
marker is at the center of the cursor region and the
Y position is the mean of the data within the re-
gion. When a spot cursor region is used, the cur-
sor marker is confined to a single X screen loca-
tion. However, depending upon the horizontal
scaling, each X screen location may represent
multiple data points. The cursor marker can still
seek the min, max, or mean of the data at a single
X screen location.
The Cursor Position displays the X position (bin
# and time) and the Y data of the cursor marker. In
the case where each X screen location represents
multiple data points, the actual bin# corresponding
to the min, max, or mean is displayed. Pressing
the [CURSOR] key will draw a box around the cur-
sor information. When the cursor readout is sur-
rounded by a box, the spin knob is to adjusts the
position of the cursor region. The cursor region
moves in increments of one X screen location or
pixel.
MENU DISPLAY
The Soft Key menu boxes define the functions of
the 6 soft keys at the right of the screen. The
menu boxes are grouped into menus. Pressing
each of the ten menu keys will display a different
menu of boxes. Related functions are grouped into
a single menu. In general, pressing a soft key
does one of two things. One is to toggle between 2
or 3 choices directly. An example is the Trigger
Slope box illustrated on the previous page. Press-
ing the second soft key toggles the slope between
rising and falling. The second soft key function is
to highlight an entry field and knob function. An ex-
ample would be the Trigger Level. Pressing the
first soft key will highlight the Trigger Level value.
The Trigger Level may then be adjusted with the
knob or programmed with a value using the nu-
meric entry keys. Each menu is described at
length in a following section.
DATA ACQUISITION STATUS
The Data Acquisition status is displayed in the
upper left corner. The acquisition status is always
displayed and is always in inverse video. CLR indi-
cates that the accumulation memory and counters
are reset. The data are all zeroes. All parameters
can be changed while in the CLR state. Pressing
the [START] key will start data acquisition and the
status will change to BUSY. While in the BUSY
state, data is graphed as it accumulates and pa-
rameters related to the data acquisition may not
be changed. When the programmed number of
records per scan has accumulated, then data ac-
quisition is DONE. The graph will show the final
accumulation. Acquisition may be paused during
BUSY by pressing the [STOP] key. The status is
then PAUSE. While in the PAUSE state, the
[START] key continues data acquisition and the
[STOP] key will reset to the CLR state. In general,
pressing the [STOP] key twice in succession will