Measurement-computing PC104-DAS16JR/12 Manuel d'utilisateur télécharger pdf (Page 27)

Counter section

Counter type 82C54

Configuration 3 down-counters, 16 bits each

Counter 0 - Independent user counter

Source: Programmable (external or

100 kHz internal source)

Gate: Available at connector (DIn 2)

Output: Available at connector (Ctr 0

Out)

Counter 1 - ADC Pacer Lower Divider

Source: Jumper-selectable 1/10 MHz

Gate: Tied to Counter 2 gate, can be

program-enabled at user

connector (DIn 0 / Trigger).

Output: Chained to Counter 2 Clock.

Counter 2 - ADC Pacer Upper Divider

Source: Counter 1 Output.

Gate: Tied to Counter 1 gate,

programmable source.

Output: Programmable as ADC Pacer

clock, hardwired to user

connector (Ctr 2 Out)

Clock input frequency 10 MHz max

High pulse width (clock input) 30 ns min

Low pulse width (clock input) 50 ns min

Gate width high 50 ns min

Gate width low 50 ns min

Input low voltage 0.8V max

Input high voltage 2.0V min

Output low voltage 0.4V max

Output high voltage 3.0V min

Crystal oscillator

Frequency 10 MHz

Frequency accuracy 100 ppm

Environmental

Operating temperature range 0 to 50°C

Storage temperature range −40 to 100°C

Humidity 0 to 90% non-condensing

23

1 2 ... 22 23 24 25 26 27 28 29 30 31 32

Commentaires sur ces manuels

Pas de commentaire