Axcpci 3901

High Speed Counter Compact PCI Board

Axcpci 3901 is a high-speed counter board equipped with a 4-channel 32-bit counter. Pulse input up to 200 MHz can be measured, input signal level can be set for each channel by register setting TTL or NIM. You can set two operation modes: a counter mode to measure the number of pulses within a fixed time and a timer mode to measure the time to the set number of pulses.

Specification

Pulse signal input	Number of channels	4 ch
	Signal level	TTL or NIM (set for each channel by register setting)
	Maximum repetition frequency	200 MHz
	Input resistance	TTL: 1 KΩ, NIM: 51 Ω
	Connector	LEMO connector
External gate signal input	Number of channels	1ch
	Signal level	TTL
	Minimum pulse width	Hi level: 80 s, Lo level: 80 s
	Maximum repetition frequency	8 MHz
	Input resistance	1 KΩ or 50 Ω
	Connector	LEMO connector, also used as internal gate output (switched by register setting)
Internal gate signal output	Number of channels	1ch
	Signal level	TTL
	Output current	± 20 mA (max.)
	Signal output switching	Gate signals of arbitrary ch are output as external outputs
	Input resistance	1 KΩ or 50 Ω
	Connector	LEMO connector, shared with external gate input (switched by register setting)
Counter mode	Counter	32 bit
	Count comparator	32 bit
	Gate signal selection	External gate or internal gate can be selected for each channel
	External gate signal	Common to all channels
	Internal gate signal	Counter enable time can be set for each ch. Setting range: 10 ns to 42.94967296 s (10 ns unit) 1 μs to 4294.967296 s (1 μs unit)
Timer mode	Timer length	32 bit
	Timer source clock	Select from 10 ns or 1 μs
	Timer measurement range	10 ns to 42.94967296 s, 1 μs to 4294.967296 s
	Number of channels	4 ch
cPCI bus	cPCI standard compliant	(32 bit / 33 MHz)
	Hot swap function	There
	Interrupt	INTA
Power-supply voltage	DC 5 V ± 5%, DC 3.3 V ± 5% (supplied from the cPCI bus)
Outline	cPCI 3U single slot board size 100 x 160 mm