Document type:
Title:
Revision date:
Re vision:
User's Manual (MUT)
N1145 Quad Scaler and Preset Counter/Timer
05/11/2003
0
NPO:
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Page:
00115/01:N1145.MUTx/00
N1145_REV0.doc
14
8
2.4. Technical specification table
Table 2.1: Mod. N1145 Technical Features
Packaging
Two units wide NIM module
Inputs
1 NIM/TTL level input per section,
50
Ω
impedance;
min. FWHM: 2 ns
1
(sections 1 ÷ 4), 3 ns (section 5)
Comm. Reset
1 NIM/TTL input,
50
Ω
impedance; clears sections from 1 to 4,
min. FWHM: 3 ns
Gate
Section 1 and 3: 2 bridged high-impedance NIM/TTL inputs
Section 2 and 4:
50
Ω
impedance NIM/TTL input
Control
inputs
Load
1 NIM/TTL input, loads counter with value set on thumb-wheel
switches, min. FWHM: 3 ns
Carry
(Section 2 and 4)
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
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)
Control
outputs
Out
2 NIM outputs; are true as long as counter's value differs from
zero
Sections 1 to 4
250 MHz
Max.
frequency
Section 5
80 MHz
1
FWHM
is 2.2 ns when GATE + CLEAR mode (see § 3.1) is used.