Measurement-computing USB-QUAD08 Manual de usuario descargar pdf (Pagina 30)

USB-QUAD08 User's Guide Specifications

Digital I/O – Timer outputs – Terminal count outputs

Table 3. Output specifications

Parameter

Specification

Number of I/O

8 independent

Configurable

Timer outputs (DIO6, DIO7 only), Terminal count/Modulo, Input/Output (default)

Input:

Input characteristics

Weak 10 kΩ resistor pulled-up to 5V with protection diode (+V

USB

– diode drop).

Input high

+2.0 V to 42.4 V

50 VDC

Input low

0 V to 0.8 V

Output:

Output characteristics

Open-collector Darlington transistors with CEMF suppression diodes (ULN2803)

Output logic supply

User voltage supply up to 50 VDC (42.4 V

) for strong drive.

CEMF Supply (CLMP+)

Connect to logic supply positive terminal up to 50 VDC (42.4 V

)

Output high

2.0 VDC to 50 VDC (42.4 V

); dependent upon logic supply.

Output low

<0.8 V

Output sink current

500 mA per pin, 2.5 A max. per device (parallel connections for higher current needs)

requires external supply.

Output generation

Counter events or timer outputs (bits 6 and 7); asynchronous generation

Asynchronous throughput

4000 updates/second, typ (tested on Windows XP and Windows Vista32)

Timer outputs:

Number of channels

Two 16-bit

 Timer Output 0 (DIO6)

 Timer Output 1 (DIO7)

Effective frequency range

0.01123 Hz to 5 MHz

Trigger and pacer

Table 4. Trigger and pacer specifications

Parameter

Specification

Digital type

Edge/level sensitive; software-selectable.

Trigger types

Start acquisition process

Pacer

Latch counter values for read back

Trigger and pacer inputs

 Internal (software)

 External

Trigger and pacer input

–0.5 V to 7.0 V

External pacer frequency

8 MHz, max

Indicator LEDs

Table 5. LED specifications

Parameter

Specification

Power LED

Indicates that the device’s microcontroller has power and is running.

Status LED

Indicates that the USB is configured; blinks to indicate USB traffic.

Channel LEDs

Indicates that the encoder/counter is receiving a valid signal on any of the inputs.

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