17
ZOC33
Section 4: Electronic Components
SECTION 4: ELECTRONIC COMPONENTS
Amplifier Board
The amplifier board receives an millivolt input from the
channel selected by the multiplexer. The signal is ampli
-
fied to a nominal 2.5 Vdc full scale and output through the
decoder board to the I/O connector. The amplifier gain
is set by selecting R1 to match the average output of the
sensors. The amplifier (INA110) has a settling time of 20
microseconds which means that the module channels can
be scanned at 40 kHz in a “stand-alone” configuration.
Gain and zero adjustments are provided to permit the
user to better match the ZOC33 to a non-HyScan system
(Figure 4.1). This circuit also receives an input from an RTD
mounted on the Decoder Board. The RTD circuit provides a
feedback to the amplifier that increases the gain by approx
-
imately 0.2%/°C. This will compensate for the 0.2%/°C
decrease in output inherent in pieziorestive sensors.
Figure 4.2 - ZOC33 Amplifier Board Schematic
Figure 4.1 - Zero and Span adjustments
CAUTION! Adjusting the Zero and
Span adjustments will invalidate
any current calibration coeffi
-
cients for the module.
Summary of Contents for ZOC 33/64Px
Page 4: ...INTENTIONALLY LEFT BLANK...
Page 11: ...7 ZOC33 Section 2 Introduction Figure 2 3 Current ZOC33 64PxX2 Dimensions inches mm...
Page 15: ...11 ZOC33 Section 3 Installation Operation Figure 3 2 ZOC33 Analog Interface...
Page 20: ...16 ZOC33 Section 4 Electronic Components INTENTIONALLY LEFT BLANK...
Page 24: ...20 ZOC33 Section 4 Electronic Components Figure 4 5 ZOC33 Decoder Board Connector Pinouts...
Page 25: ...21 ZOC33 Section 4 Electronic Components Figure 4 6 ZOC33 Decoder Board Layout...
