Entering The Diagnostic Graph Screen; Diagnostic Text Display; Time Base Control; Correlated Plot - Siemens SITRANS F Instruction Manual

Section 2

Entering the Diagnostic Graph Screen

Before you can view the Diagnostic Graph Screen the FUE1010EN flow channel must first be properly
installed and operating in a non-empty condition (refer to the appropriate Sitrans F 1010 field manual).
If a previously installed channel is in a "Fault" condition, but not reporting "Empty", you can still access the
Graph Screen to aid in troubleshooting the cause of the failure to measure flow.
To view the Graph Screen first enter the [Test Facilities] menu, which is a submenu of the main [Diagnos-
tic Data] menu.
Pressing the <Up/Down Arrows>, scroll to the [Graph] menu item.
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Press the <Right Arrow> to enter the [Graph] menu and scroll to highlight the [Yes] item in the option
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list.
Now press the <ENTER> key to access the Graph Screen.
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To exit the Graph Screen and return to the main menu, press the <MENU> key once.
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Diagnostic Text Display

The text to the upper left-hand corner of the screen represents diagnostic items which can be individually
turned on or off to reduce unnecessary clutter on the screen. This text display can be modified by
pressing the <ENTER> key and scrolling up or down through the various parameters that appear in the
Graph Display menu. Pressing the <ENTER> key will select the highlighted parameter (a "+" sign ap-
pears next to selected items) and pressing <CLR> will deselect the item. Pressing the <Left Arrow> will
return you to the graph screen with the selected parameters appearing at the top left corner of the
screen. (The figure above is shown with all diagnostics items selected).

Time Base Control

The digitized receive signal can be moved either to the left or right on the screen by pressing the <Left>
or <Right> keypad arrows. The direction of the arrow actually represents the direction in which the
receive "window" will move, thereby causing the receive signal to shift in the opposite direction on the
screen (e.g., Pressing the <Left Arrow> moves the signal to the right).
The digitized receive signal can be expanded or contracted in the time domain by pressing the <+> or <-
> keys on the keypad. This allows you to see the entire contents of the receive window, or zoom in to see
greater detail. Pressing the <CLR> key once will automatically center the receive signal on the screen.
When zooming in on the receive signal small vertical "tick" marks may appear. These marks represent
the time at which the receive signal is digitally sampled.

Correlated Plot

During conditions of flow, the actual transit time delta (difference) can be observed in the displayed
receive signal waveform when the [Correlated Plot] menu parameter is not selected. To observe this
time difference simply depress the <+> key (to see greater signal detail) until the individual up and down
receive signals are clearly discernible.
To verify that the FUE1010EN signal processing algorithms are properly correlating the up and down
stream receive signals, select the [Correlated Plot] option from the display menu list. Return to the graph
screen and observe the relative position of the up and down waveforms. In a properly correlated receive
signal the two images should be nearly superimposed on top of each other, even during high flow con-
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