It is a VME bus compatible high-speed counter board with 8-channel input that can perform either in counter mode or a timer mode for a wide variety of applications. TTL or NIM level can be used as an input pulse signal.
All eight channels have a 24-bit length counter. Counters can be used as a 48-bit counter by connecting them in a cascade connection.
This board is capable of measuring a maximum pulse repetition frequency of 100MHz.
Each channel has an independent interrupt vector, allowing various interrupt events to be issued.
100ns, 1µs, 10µs or 100µs can be selected as the minimum resolution in timer mode.
External and internal gate
External gate signal can be used to add a gate signal from outside.
Internal gate signal can be programmed within the range 1ms to 990s.
By setting the internal register from the software, the internal gate signal of any channel can be sent externally. The gate switching toggle switch on the front panel can be set to switch between external gate signal input and internal gate signal output.
Other features
Each channel has a LED lamp for monitoring the status of input signals.
C-language sample program is provided.
Device driver for VxWorks® available (option).

Architecture:

• VME compliant

Pulse Input:

• Eight channels
• Input signal level: TTL/NIM (switch using switch on front panel)
• Maximum input frequency: 100MHz (minimum pulse width is 5ns)
• Input resistance: TTL: 1kOhm;, NIM: 51Ohm;
• Connector: LEMO connector

External Gate Signal:

• One channel
• Input signal level: TTL
• Minimum pulse width: 160s (count enable for Hi level)
• Input resistance: 1.8 kOhm;
• Connector: LEMO connector (Shared use with external gate input, use the switch on the panel for switching)

Internal Gate Signal:

• One channel
• Input signal level: TTL
• Output current: Up to ±20mA
• Output signal switching: set the register to allow the gate signal for any channel to be output externally
• Connector: LEMO connector (shared use with external gate input, use the switch on the panel for switching)

Operation Mode:

• Counter or Timer mode can be programmed for each channel
• Counter mode: Measures the number of pulses while the internal or external gate signal is open:

  - 24-bit counter or 48-bit counter by cascade connection
  - Programmable internal gate signal (1ms to 990s)

• Timer mode: Measures the time until a present value is reached:

  - 20-bit comparator
  - 24-bit timer
  - Programmable timer clock (100ns, 1µs, 10µs or 100µs minimum resolutions)

Bus:

• VME bus
• Width complies with A16 (AM codes 29 and 2D) D32/D16/D08 (EO) Rev. C.3
• Functions: independent interrupt level ad interrupt vector issued for each channel

Power Supply:

• +5V DC
• -12V DC

Power Consumption:

• 3.5W typical (5V @ 700mA)
• 0.48W typical (-12V @ 40mA)

Mechanical:

• Dimensions: 6U – 172 x 262 mm (6.77” x 10.31”)
• Pitch: Single slot – 20.02 mm (0.79”)
• Weight: 300g

Operating Systems Supported:

• VxWorks®