Portable, Modular Signal Conditioning Modules
Overvoltage protection ....................... ±28 V
p
(powered on or off)
Input impedance ................................. 10 MΩ powered on, 10 kΩ
powered off or overload
Gain error ............................................ ±0.8% of reading maximum
Offset error.......................................... ±5 µV
Bandwidth ........................................... 1.6 kHz (single-pole RC filter)
Excitation voltage ............................... 2.5 V ±0.4%
NI SCC-SG Series Strain Gage
Input/Excitation
Excitation Current Drive
SG01, SG02......................................... 42 mA (with 2 120
Ω
gages)
SG03, SG04......................................... 60 mA (with 2 350
Ω
gages)
Excitation drift..................................... 13 mV/°C
Power Requirements
Model
SCC-SG01
SCC-SG02
SCC-SG03
SCC-SG04
SCC-SG11
SCC-SG24
Channel
2
2
2
2
2
2
Description
120
Ω,
quarter-bridge strain gages
350
Ω,
quarter-bridge strain gages
Half-bridge strain gages
Full-bridge strain gages
Shunt calibration
Full-bridge strain gages, load cells,
pressure sensors, torque sensors
Part Number
777459-13
777459-14
777459-15
777459-16
777459-17
777459-37
Analog ................................................. 143 mW
Digital.................................................. 210 mW
SCC-SG11
Number of channels............................
Control signal......................................
Resistor for each channel ...................
Resistor temperature coefficient........
2
1 DIO channel
301 kΩ ±1%, socketed
±100 ppm/°C
The National Instruments SCC-SG Series consists of dual-channel strain
gage modules for conditioning quarter, half, and full-bridge strain gages
and a calibration module. Each module is designed for a specific type of
bridge configuration. Each channel of an NI SCC-SG module (except
SCC-SG11) includes an instrumentation amplifier, a 1.6 kHz lowpass
filter, and a potentiometer for bridge-offset nulling. Each SCC-SG0x
module also includes a single 2.5 V excitation source. The SCC-SG24
has a 10 V excitation source for load cells and pressure sensors.
The SCC-SG11 is a dual-channel shunt calibration module for use with
the SCC-SG0x and SCC-SG24 modules. Each channel includes two
terminals for wiring a switched 301 kΩ, 1 percent, 1⁄4 W resistor across
any two points of your bridge. You enable shunt calibration for both
channels of a module by writing a logic high to the digital line controlling
the SCC-SG11. You disable shunt calibration by writing a logic low to the
same digital line.
When you install an SCC-SG module in the SC-2345, the carrier routes
the strain gage signals to two input channels of the multifunction DAQ
device, channels x and x+8, where x is 0 through 7.
Power Requirements
Digital.................................................. 25 µW
SCC-SG24
Input Characteristics
Number of channels............................
Input signal range ...............................
Output signal range ............................
Gain ....................................................
Overvoltage protection .......................
Input impedance .................................
Gain error ............................................
Offset error..........................................
Bandwidth ...........................................
Excitation voltage ...............................
Excitation current drive.......................
Excitation drift.....................................
2 differential
±100 mV
±10 V
100
±42 VDC powered on and
powered off
20 MΩ powered on >60 kΩ
powered off or overload
±0.20% of reading max
±50 µV typ, 325 µV max before
calibration
1
1.6 kHz single-pole buffered RC
filter
10 V ±0.05%
60 mA, based on two full-bridge
350
Ω
strain gages
10 ppm/°C
Specifications
SCC-SG0x
Input Characteristics
Number of channels............................
Input signal range ...............................
Output signal range ............................
Gain ....................................................
2 differential
±100 mV
±10 V
100
Power Requirements
Analog ................................................. 340 mW
Digital.................................................. 930 mW
1
By
factory default, the nulling resistors are not installed in the SCC-SG24. See the user
manual for information on installing the nulling resistors.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
6
NI [ NATIONAL INSTRUMENTS CORPORATION ]
