Measurement-computing USB-2020 Manuel d'utilisateur télécharger pdf (Page 19)

USB-2020 User's Guide Specifications

Accuracy

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

Range Gain error

(% of reading)

Offset error

(mV)

INL error

(% of range)

Absolute

accuracy at

Full Scale

(mV)

Gain

temperature

coefficient

(% reading/°C)

Offset

temperature

coefficient

(µV/°C)

±10 V

0.11

5.2

0.0976

35.72

0.0035

±5 V

0.11

5.2

0.0488

20.46

0.0035

110

±2 V

0.11

1.1

0.0244

8.18

0.0035

±1 V

0.11

1.1

0.0122

4.64

0.0035

Noise performance

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

BNC connector and 20,000 data samples are acquired at the maximum rate.

Table 3. Noise performance specifications

Range Counts LSBrms

±10 V

0.76

±5 V

0.76

±2 V

1.06

±1 V

1.06

Analog input calibration

Table 4. Analog input calibration specifications

Parameter Specification

Recommended warm-up time

15 minutes min.

Calibration method

Self calibration, with calibration factors for each range stored onboard in non-volatile

memory

Calibration interval

1 year (factory calibration)

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

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Measurement-computing USB-2020 Manuel d'utilisateur Page 19

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