Measurement-computing USB-2408 Series Instrukcja Użytkownika Pobierz pdf (Strona 26)

USB-2408 Series User's Guide Specifications

The multiple-channel throughput rate is calculated using this formula:

Maximum throughput = , where n is the number of channels

Table 12. Multiple-channel throughput rate specifications (Hz)

Number

of input

channels

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s

50 S/s

25 S/s

10 S/s

5 S/s

2.5 S/s

1102.94

877.19

609.76

378.79

93.98

57.78

48.45

24.61

9.94

4.98

2.50

551.47

438.60

304.88

189.39

46.99

28.89

24.22

12.30

4.97

2.49

1.25

367.65

292.40

203.25

126.26

31.33

19.26

16.15

8.20

3.31

1.66

0.83

275.74

219.30

152.44

94.70

23.50

14.45

12.11

6.15

2.48

1.25

0.62

220.59

175.44

121.95

75.76

18.80

11.56

9.69

4.92

1.99

1.00

0.50

183.82

146.20

101.63

63.13

15.66

9.63

8.07

4.10

1.66

0.83

0.42

157.56

125.31

87.11

54.11

13.43

8.25

6.92

3.52

1.42

0.71

0.36

137.87

109.65

76.22

47.35

11.75

7.22

6.06

3.08

1.24

0.62

0.31

122.55

97.47

67.75

42.09

10.44

6.42

5.38

2.73

1.10

0.55

0.28

110.29

87.72

60.98

37.88

9.40

5.78

4.84

2.46

0.99

0.50

0.25

100.27

79.74

55.43

34.44

8.54

5.25

4.40

2.24

0.90

0.45

0.23

91.91

73.10

50.81

31.57

7.83

4.82

4.04

2.05

0.83

0.42

0.21

84.84

67.48

46.90

29.14

7.23

4.44

3.73

1.89

0.76

0.38

0.19

78.78

62.66

43.55

27.06

6.71

4.13

3.46

1.76

0.71

0.36

0.18

73.53

58.48

40.65

25.25

6.27

3.85

3.23

1.64

0.66

0.33

0.17

68.93

54.82

38.11

23.67

5.87

3.61

3.03

1.54

0.62

0.31

0.16

Analog voltage output (USB-2408-2AO only)

Unused AOUTx output channels should be left disconnected.

The USB-2408-2AO output voltage level defaults to 0 V whenever the host PC is reset, shut down or

suspended, or if a reset command is issued to the device.

The outputs may have a transient during startup. The duration of the output transient depends highly on the

enumeration process of the host PC. Typically, the output of the USB-2408-2AO is stable after two seconds.

Table 13. USB-2408-2AO analog voltage output specifications

Parameter

Conditions

Specifications

Digital-to-analog

converter

DAC8552

Number of channels

Resolution

16 bits

Output ranges

Calibrated

±10 V

Uncalibrated

±10.05 V (software-selectable)

Output transient

Host PC is reset, powered on, suspended or a reset

command is issued to device

Duration: 2 s

Amplitude: 2 V p-p

Initial power on

Duration: 50 ms

Amplitude: 5 V peak

Differential non-linearity

±0.25 LSB typ

±1 LSB max

Output current

AOUTx pins

±5.0 mA max

Output short-circuit

protection

AOUTx connected to AGND

Unlimited duration

Output coupling

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 32 33 34

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