Measurement-computing USB-1608GX-2AO-OEM Uživatelský manuál stáhnout pdf (Strana 18)

USB-1608GX-2AO-OEM User's Guide Specifications

Accuracy

Analog input DC voltage measurement accuracy

Table 2. DC Accuracy components and specifications. All values are (±)

Range

Gain error

(% of reading)

Offset error

(µV)

INL error

(% of range)

Absolute

accuracy at

Full Scale

(µV)

Gain

temperature

coefficient

(% reading/°C)

Offset

temperature

coefficient

(µV/°C)

±10 V 0.024 915 0.0076 4075 0.0014 47

±5 V 0.024 686 0.0076 2266 0.0014 24

±2 V 0.024 336 0.0076 968 0.0014 10

±1 V 0.024 245 0.0076 561 0.0014 5

Noise performance

For the peak-to-peak noise distribution test, a differential input channel is connected to AGND at the input

terminal block, and 32,000 samples are acquired at the maximum rate available at each setting.

Table 3. Noise performance specifications

Range Counts LSBrms

±10 V 6 0.91

±5 V 6 0.91

±2 V 7 1.06

±1 V 9 1.36

Settling time

Settling time is defined as the accuracy that can be expected after one conversion when switching from a

channel with a DC input at one extreme of full scale to another channel with a DC input at the other extreme of

full scale. Both input channels are configured for the same input range.

Table 4. Input settling time specifications in µS, typical

Range 2 µS settling accuracy

(% FSR)

4 µS settling accuracy

(% FSR)

9 µS settling accuracy

(% FSR)

±10 V 0.1251 0.0031 0.0015

±5 V 0.0687 0.0031 0.0015

±2 V 0.0687 0.0031 0.0015

±1 V 0.0687 0.0031 0.0015

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25 26

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