Measurement-computing USB-DIO24H/37 Bedienungsanleitung PDF herunterladen (Seite 16)

USB-DIO24H/37 User's Guide Specifications

Counter

Table 2. Counter specifications

Pin name (Note 4)

CTR

Counter type

Event counter

Number of channels

Input source

CTR screw terminal

Input type

TTL, rising edge triggered

Resolution

32 bits

Schmidt trigger hysteresis

20 mV to 100 mV

Input leakage current

±1 µA

Maximum input frequency

1 MHz

High pulse width

500 ns min

Low pulse width

500 ns min

Input low voltage

0 V min, 1.0 V max

Input high voltage

4.0 V min, 15.0 V max

Note 4: CTR is a Schmitt trigger input.

Data transfer rates

Table 3. Data transfer rate specifications

Digital I/O transfer rates (software paced)

Digital input

62 port reads or single bit reads per second (typical)

Digital output

125port writes or single bit writes per second (typical)

Counter/timer read/write rates (software paced)

Counter read

62 port reads per second (typical)

Counter clear

125 port writes per second (typical)

Power

Table 4. Power specifications

Parameter

Conditions

Specification

Supply current (Note 5)

No Load

100mA typ, 135 mA max

Input power requirements (Note 6)

4.75 V min, 5.25 V max

USB +5 V power available

Measured at "USB +5 V" screw

terminals (pins 10, 14, and 30)

4.4 V min, 5.25 V max

USB +5 V power

output current (Note 7)

Connected to:

 Self-powered hub

 Externally-powered root port hub

[350 mA] – [total output source

current]

USB +5 V over-current protection

Resettable fuse

Hold current: 350 mA, typical

Trip current: 700 mA typical

Trip/recovery time: 100 mS, max

On resistance: 1.3 Ohms max

Note 5: This is the total (no load) current requirement for the USB-DIO24H/37.

Note 6: Bus-powered hubs are allowed to provide downstream USB power as low as 4.4 V. Although your

USB-DIO24H/37 will typically function at this 4.4 V minimum, guaranteed performance requires a

minimum power supply voltage of 4.75 V. All self-powered and root port hubs will meet this 4.75 V

minimum.

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