Chapter 2. Displaying Data
62
DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
2.5.3 Graphical Format (cont.)
In the typical graphical display shown, the first logged parameter
(VEL)
is shown to the left of the y-axis and there is
a
message line
below the graph that initially indicates the starting date and time of the current page. Notice that
most of the locator bar has been replaced by a
status line
in standard video that shows the value, units and time of
the record at the current cursor location. However, there is still an inverse video
pointer
at the far right of this line to
indicate that additional option bar choices are available.
Note:
The date in the message line includes only the day and the month (not the year), and the times in the status
line and the message line include only the hours and minutes.
2.6 Displaying Transducer Signals
The
SIGNL
submenu permits the direct graphical display of several transducer signals. Specifically, the signals listed
in Table 31 and Table 32 may be viewed in this format.
Complete the following steps to display the transducer signals:
Press the appropriate side of the
[SCREEN]
key to activate the desired pane of the display screen, then proceed as
follows:
Note:
For this discussion, it is assumed that the left pane of the display screen is active. If the right pane is active,
it is only necessary to replace the
[F1]-[F4]
keys designations by the
[F5]-[F8]
keys.
1.
To access the
Display Menu
, press the
[DISP]
key.
2.
Press [
and
[F1]
=
SIGNL
.
The signal graph is a plot of signal amplitude (y-axis) vs. time in microseconds (x-axis). When the
SIGNL
display
screen first appears, it may briefly remain blank. As soon as the signal is acquired, processed and loaded into the
display memory, the graph will appear. A
cursor
, which is displayed as a vertical line that extends the full height of the
graph window, is used to highlight any point in time along the x-axis.
3.
Use the [
, [
and
[F1]-[F4]
keys to select the desired option. The options are listed in Table 33 on page 63.
Table 31: Transit-Time Transducer Signals
Transducer Signal
Description
Sup
upstream signal
Sdown
downstream signal
Cup
upstream correlation
Cdown
downstream correlation
CC
cross-correlation
Table 32: TransFlection Transducer Signals
Transducer Signal
Description
Corr
correlated signal
Sig
receive signal