LDS Dactron FOCUS II, System Manual, Page: 14 / 70

Introduction
Focus II System Guide 10
Strain Gage
Four channel signal conditioning module for full bridge and half bridge strain
gages, maximum of 16 simultaneous channels per unit.
Input format Differential
Input Connector 6 pin LEMO 0B
Impedance 2 M
Ω
, 1M
Ω
each pin to GND
Excitation voltage
2.5V, 5.0V, 10.0V, selectable per module
Excitation Current
50mA/Channel Max with over current protection
Input ranges 2mV, 5mV, 10mV, 20mV, 100mV
Zero Suppression ±
500mV adjustment range with 65536 steps
Max. input voltage ±
40Vpeak
Coupling DC or Digital AC
A/D 24 Bit
Sample rate 32 S/s to 96 kS/s
Bandwidth DC - 30 kHz
Filter Analog and Digital Anti-Alias Filters, Ripple Elimination Filter
DC Gain Accuracy
0.1% for
±
100 mV input range
0.3% for
±
20 mV input range
0.5% for
±
10 mV input range
0.8% for
±
5 mV input range
1.2% for
±
2 mV input range
Offset error 100uV max.
Auto-Balance 16 bits D/A converter
Auto-Balance Limits -500mV to +500mV for all input range
Half Bridge Resistors Two precision resistors, 10k Ω , each, 0.1% ratio matching
Shunt Calibration
Type Two independent points
Shunt Resistors: 2 Resistors, 36k Ω , 9k Ω
Switch resistance 1.7 Ω typical, 2.5 Ω MAX,
Switch-off leakage <0.5nA @ 25 degree C, <2.5nA from 0 to 70 degree C
All Specifications subject to change without notice.