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 with 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 wave
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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