Measurement-computing USB-1208FS-Plus Manuel d'utilisateur télécharger pdf (Page 25)

USB-1208FS-Plus User's Guide Specifications

Counter

Table 14. Counter specifications

Parameter

Specification

Pin name

CTR

Counter type

Event counter

Number of channels

Input type

Schmitt trigger, 47 kΩ pull-down to ground, rising edge triggered

Input source

CTR screw terminal

Resolution

32 bits

Maximum input frequency

1 MHz

High pulse width

500 ns min

Low pulse width

500 ns min

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

3.1V max

Input high voltage limit

5.5 V absolute max

Input low voltage threshold

1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit

–0.5 V absolute min

0 V recommended min

Memory

Table 15. Memory specifications

Non-volatile EEPROM

2,048 bytes (768 bytes calibration, 256 bytes user, 1,024 bytes DAQFlex)

Microcontroller

Table 16. Microcontroller specifications

Type

High performance 16-bit RISC microcontroller

Power

Table 17. Power specifications

Parameter

Condition

Specification

Supply current

During USB enumeration

< 100 mA

After USB enumeration, including DIO, AO, SYNC,

and +VO output loading

< 500 mA

+VO power available

After USB enumeration

4.5 V min, 5.25 V max

+VO output current

After USB enumeration

100 mA max

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Measurement-computing USB-1208FS-Plus Manuel d'utilisateur Page 25

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