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Four 8-digit up-counters with 250 MHz max counting rate
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One 7-digit down-counter with 80 MHz max counting rate
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NIM and TTL inputs
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One LED display per section
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Up to three sections can be cascaded for 24-digit counting
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Frequency and frequencies ratio measurements
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Individual GATE and RESET per counter
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Manual or pulse triggered RESET
The CAEN Mod. N1145 is a double unit NIM module that includes four independent 8-digit counters each with their own display and can accept up to 250-MHz input rates. These counters can be cascaded to increase the word length to 16-digits for two counters, and 24-digits for three counters. Counters 2 and 4 have a “Carry” or overflow output to allow the cascading of the counters. Counters 1 and 3 have a set of bridged gate connectors to allow a single gate to be used on multiple counters.
An 80-MHz fifth counter with its own display can be used as a timer, counter, rate divider, or delay.
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Compare
|
Image
|
Name
|
Package
|
No. of Channels
|
Input Type
|
Count Rate (MHz)
|
Channel Depth
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Connectors
|
|
|
New DT1081B |
Desktop |
24 |
NIM / TTL |
50 |
n.a. |
LEMO |
|
|
FW2495SC |
VME/Desktop |
64 (expandable up to 160) |
ECL / LVDS / PECL NIM / TTL |
200 |
64 bit |
Robinson Nugent Flat / LEMO |
|
|
FW1495SC |
VME |
64 (expandable up to 128) |
ECL / LVDS / PECL NIM / TTL(2) |
200 - 250 |
32 bit |
Robinson Nugent Flat / LEMO |
|
|
N1145 |
NIM 2U |
4+1 downcounter |
NIM / TTL |
4x250 + 1x80 |
4x8 + 1x7 digit |
LEMO |
|
|
N1081B |
NIM |
24 |
NIM / TTL |
50 |
n.a. |
LEMO |
Technical Specifications
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Packaging |
Two units wide NIM module |
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Inputs |
1 NIM/TTL level input per section, 50 Ohm impedance;min. FWHM: 2 ns (sections 1 ÷ 4), 3 ns (section 5) |
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Gate |
Section 1 and 3: 2 bridged high-impedance NIM/TTL inputs Section 2 and 4: 50 Ohm impedance NIM/TTL input |
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Carry |
std. NIM level; two sections can be cascaded by feeding first CARRY into the input of the second section, thereby making a 16-digit counter |
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Load |
1 NIM/TTL input, loads counter with value set on thumb-wheel switches, min. FWHM: 3 ns |
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Comm. Reset |
1 NIM/TTL input, 50 Ohm impedance; clears sections from 1 to 4, min. FWHM: 3 ns |
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Out |
2 NIM outputs; are true as long as counter’s value differs from zero |
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End marker |
1 NIM output; a pulse is generated when the counter reaches zero. Pulse width can be adjusted by turning the front panel trimmer (50 ns to 1 µs) |
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Max. frequency |
Sections 1 to 4: 250 MHz (2 ns pulse FWHM) |
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