Emerson 755A Manual De Usuario
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Instruction Manual
245364-V
May 2002
Rosemount Analytical Inc. A Division of Emerson Process Management
Circuit Analysis 5-11
Model 755A
5-7 BUFFER AMPLIFIERS U10 AND
ASSOCIATED ANTICIPATION FUNCTION
Refer to Figure 5-9 below. U10 is a non-
inverting buffer amplifier that incorporates an
anticipation arrangement in its input network,
thus providing slightly faster response on the
readout device(s).
inverting buffer amplifier that incorporates an
anticipation arrangement in its input network,
thus providing slightly faster response on the
readout device(s).
Potentiometer R30 provides a continuously
variable adjustment of 5 to 25 seconds for the
electronic response time (90% of fullscale)
and is factory-set for 20 seconds.
variable adjustment of 5 to 25 seconds for the
electronic response time (90% of fullscale)
and is factory-set for 20 seconds.
Since the anticipation network attenuates the
signal, a gain of 10 is provided by the
feedback network associated with U10 to
restore the signal to the desired fullscale
range of 0 to 10VDC.
signal, a gain of 10 is provided by the
feedback network associated with U10 to
restore the signal to the desired fullscale
range of 0 to 10VDC.
The pressure-corrected output signal from
U10 is routed to two output circuits:
U10 is routed to two output circuits:
•
Digital Output Circuit, Section 5-8 on page
5-12
5-12
•
Analog Output Circuits for Recorder and
Alarms, Section 5-9 on page 5-12
Alarms, Section 5-9 on page 5-12
Figure 5-9. Buffer, Anticipation, and Digital Output Circuit
-
+
U10
R30
R29
Differentiator
Network
ADC
71C03
8052A
REF
DISPLAY
DRIVER AND
CONTROL
+15V
5V
U18
5V
REGULATOR
To Analog Output Circuit
(Figure 6-9)
(Figure 6-9)
DIGITAL
DISPLAY