National Instruments NI USB-6008/6009 - page 25

© National Instruments Corporation 25 NI USB-6008/6009 User Guide and Specifications
Timing accuracy.....................................100 ppm of actual sample rate
Input range
Single-ended................................... ±10 V
Differential......................................±20 V1, ±10 V, ±5 V, ±4 V,
±2.5V, ±2 V, ±1.25 V, ±1 V
Working voltage.....................................±10 V
Input impedance.....................................144 kΩ
Overvoltage protection...........................±35
Trigger source........................................ Software or external digital
trigger
System noise2
Single-ended
±10 V range............................. 5 mVrms
Differential
±20 V range............................. 5 mVrms
±1 V range............................... 0.5 mVrms
Absolute accuracy at full scale, single-ended
Absolute accuracy at full scale, differential3
1 ±20 V means that |AI+ – (AI–)| <= 20 V. However, AI+ and AI– must both be within ±10 V of GND. Refer to the Connecting
Differential Voltage Signals for more information.
2 System noise measured at maximum sample rate.
Range Typical at 25 °C (mV) Maximum over Temperature (mV)
±10 14.7 138
3 Input voltages may not exceed the working voltage range.
Range Typical at 25 °C (mV) Maximum over Temperature (mV)
±20 14.7 138
±10 7.73 84.8
±5 4.28 58.4
±4 3.59 53.1
±2.5 2.56 45.1