SIREC D Display Recorder 7ND4000

4.8 MEASUREMENT
This menu item allows you to program items directly
affecting measurement of Inputs. The following
programming options are available in the
Measurement Menu:
• TCBO Interval - Allows you to change the
Thermocouple Burn Out (TCBO) check time
interval. This is how often the recorder checks
whether or not there is an open circuit on a
thermocouple input by injecting a small current
onto the input.
• Span & Offset - Allows you to turn Span and
Offset off or on for RTDs and Thermocouples.
• Demo Mode - Allows you to turn on the Demo
mode using internally generated signals
4.8.1 TCBO Interval. This function allows
defining the TCBO check time interval. Disabling
TCBO is accomplished by setting the TCBO Interval
to zero seconds. The default value is 300 seconds
(5 minutes).
1. Selecting TCBO Interval - From the Measurement
menu, use the UP (↑) or DOWN (↓) Arrow
Key to highlight “Tcbo intervl" and press ENTER.
The display will read “seconds�XXX�".
2. Programming TCBO Interval - Use the Numeric
keypad to enter the TCBO interval in seconds
up to a maximum of 600. When the desired
interval is displayed, press ENTER and the display
returns to the "Tcbo intervl" prompt in the
Measurement Setup Menu.
4.8.2 Span & Offset. This function enables
Span and Offset compensation to allow for
correction of known inaccuracies in Thermocouples
and RTD's.
1. Selecting Span & Offset - From Measurement
menu, use the UP (↑) or DOWN (↓) Arrow Keys to
highlight “Span&offset" and press ENTER. The
display will read either "spnofs=NO" or
"spnofs=YES".
2. Enabling Span & Offset - Press the YES to
change the display to "spnofs=YES". Press
ENTER and the display returns to the
"Span&offset" menu prompt. Span & Offset are
enabled.
Siemens AG C79000-G7374-C211-01
SIREC D Manual
Programming
3. Disabling Span & Offset- Press the NO key to
change the display to "spnofs=NO". Press ENTER
and the display returns to the "Span&offset" menu
prompt. Span & Offset are disabled.
NOTE
If enabled, a SPAN and OFFSET compensation
menu item will be displayed in the
POINT SETUP menu for Thermocouples
and RTDs.
4.8.3 Demo Mode. Demo Mode allows you
to put the Recorder in the Demo Mode of operation.
In the Demo Mode, live inputs are ignored and
calculated points use internally generated
waveforms.
1. Selecting Demo Mode of Operation - At the
"Demo control" prompt, press ENTER and the
display reads either "Demo = YES" or “Demo =
NO".
2. If needed, change the current setting using the
keypad then press ENTER. The Demo mode is
suited to the 1 volt scale. It is advisable to set up a
demo mode then save the configuration to disk.
This can be loaded anytime the demo mode is required.
NOTE
In the Demo Mode of operation, the Recorder
ignores all live inputs and uses an
internal generator for external or calculated
points.
3. Deselecting Demo Mode of Operation - At
the "Demo control" prompt, press ENTER and the
display reads either "Demo=YES" or "Demo=NO".
4. Use the YES or NO keys to select the Demo
mode ON or OFF and press ENTER. The display
will return to the "Demo control" prompt. Powering
the unit OFF loses the Demo mode.
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