Measurement Computing PCM-D24/CTR3 rev.3 - Manual (Page 24)

Output: Available at user connector (CTR 1 Out), may
also be programmed to connect to counter 1 clock
Counter 1 - Independent user counter 2
Source: Programmable internal 10MHz or 1MHz or
counter 0 output
Gate: Internal, pulled high (enabled) by 10k resistor
Output: May be programmed to connect to counter 2 clock
Counter 2 - Independent user counter 3
Source: Programmable internal 1MHz, counter 1 output or
external (CTR 3 Clk)
Gate: External (CTR 3 Gate), pulled high (enabled) by
10k resistor
Output: User connector (CTR 3 Out)
Clock input frequency 10Mhz max
High pulse width (clock input) 30ns min
Low pulse width (clock input) 50ns min
Gate width high 50ns min
Gate width low 50ns 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
8.4 ENVIRONMENTAL
Operating temperature range 0 to 70°C
Storage temperature range -40 to 100°C
Humidity 0 to 90% non-condensing
21