Measurement-computing USB-202 Manual do Utilizador descarregar pdf (Página 18)

USB-202 User's Guide Specifications

Counter

Table 8. CTR specifications

Parameter

Specification

Pin name

CTR

Number of channels

1 channel

Resolution

32-bit

Counter type

Event counter

Input type

Schmitt trigger, 47 kΩ pull-down to ground

Counter read/write rates

(software paced)

33 to 4,000 reads/writes per second typ, system dependent

Schmitt trigger hysteresis

1.01 V typ

0.6 V min

1.5 V max

Input high voltage threshold

2.43 V typ

1.9 V min

3.1 V max

Input low voltage threshold

1.42 V typ

1.0 V min

2.0 V max

Input voltage limits

5.5 V absolute max

–0.5 V absolute min

0 V recommended min

Input frequency

1 MHz max

High pulse width

25 ns min

Low pulse width

25 ns min

Memory

Table 9. Memory specifications

Parameter

Specification

Data FIFO

12 K (12,288) analog input samples

Non-volatile memory

2 KB (768 B calibration storage, 256 B UL user data, 1 KB DAQFlex user data)

Power

Table 10. Power specifications

Parameter

Condition

Specification

Supply current

Typical (Note 3)

150 mA

Maximum (including user voltage, DIO

and AICKO loading)

500 mA

User voltage output terminal

(+VO)

4.25 V min, 5.25 V max

User voltage output current

100 mA max

Note 3: This is the total quiescent current requirement for the device which includes up to 10 mA for the Status

LED. This value does not include any potential loading of the digital I/O bits, AICKO, or user voltage.

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