Measurement-computing DaqBook 2000 Series Manual do Utilizador descarregar pdf (Página 84)

Specifications are subject to change without notice.

11-6 Specifications 898695 DaqBook/2000 and DaqOEM/2000 User’s Manual

Frequency/Pulse Counters

Counter inputs can be scanned synchronously along with analog and digital scanned inputs, based either on

internal programmable timer, or an external clock source. Bus mastering DMA provides CPU and system-

independent data transfers, insuring data acquisition performance irrespective of other system activities.

Counters can be configured to clear when read, or to totalize and clear under program control.

Channels: 4 x 16-bit, cascadable as 2 x 32-bit

Frequency Measurement Rate: 10 MHz maximum

Input Signal Range: -15 V to +

15 V

Input Characteristics: 2.7 kΩ series in parallel w

ith 20 pF to common and 10 kΩ to +5 V

Input protection: ±8 kV ESD clamp diodes parallel

Trigger Level: TTL

Minimum pulse width: 50 ns high, 50 ns low

Frequency/Pulse Generators

Channels: 2 x 16-bit

Output Waveform: Square w

ave

Output rate: 1 MHz base rate divided by

1 to 65535 (programmable)

High level output voltage: 2.0 V minimum @ -3.75 mA, 3.0 V minimum @ -2.5 mA

Low level output voltage: 0.4 V maximum @ 2.5 mA

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Measurement-computing DaqBook 2000 Series Manual do Utilizador Página 84