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© 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 V
1
, ±10 V, ±5 V, ±4 V,
±2.5 V, ±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 noise
2
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, differential
3
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