Document type:
Title:
Revision date:
Revision:
User's Manual (MUT)
Mod. N957 8k Multi-Channel Analyzer
28/05/2012
6
NPO:
Filename:
Number of pages:
Page:
00105/04:N957x.MUTx/06 N957_REV6
35
9
2.4 Input/Output
connections
IN:
Type: Input
Function: Unipolar (positive) or bipolar in a range from 0 to +10 V,
with a rise time greater than 0.1 µs, high impedance. BNC connector
(to be connected to Amplifier Analog output); negative inputs are
neglected.
GATE:
Type: Input
Function: Temporal window for peak detection (in External Gate
mode); Signal must occur prior to and must extend for at least 0.2-
μ
s
after the peak;
NIM/TTL (automatically recognised) signal, high
impedance. BNC connector.
BUSY:
Type: Output
Function: Provides NIM/TTL (switch selected, see § 2.6.1) standard
logic level signal to indicate a conversion;. Rise Time
3.5 ns. Fall
Time
3.5 ns. LEMO connector.
CONV:
Type: Input
Function: Accepts NIM/TTL (switch selected, see § 2.6.1) signal; it is
an external conversion inhibit (active high), actually it disables the on
going conversions. Input impedance: 50 Ohm; LEMO connector.
PUR:
Type: Input
Function: Pile-up rejection input; accepts NIM/TTL (switch selected,
see § 2.6.1) signal; signal must occur before the ADC Conversion
(see § 2.8.2). Input impedance: 50 Ohm; LEMO connector (to be
connected to Amplifier INHIBIT Output
1
).
OUTP:
Type: Output
Function: Provides NIM/TTL (switch selected, see § 2.6.1) standard
logic level signal programmable via USB. (OUTP default signal:
BUFFER_FULL
→
data loss; it can be turned off by resetting the Full
status flag, see § 3.3).
LINK:
B type USB connector; USB 2.0 compliant
2.5 Front panel displays
BUSY:
red LED; light up during the ADC conversion
PUR, OUTP:
green LEDs (1 per connector); light up as the relevant signal is active
CONV:
green LED; light up if CONVERSION ENABLE bit (see § 3.3) is ON
and CONV input signal is not active.
LINK ON:
green LED; lights up as USB port is powered
TX/RX:
yellow LED; signals activity on USB port
1
Amplifier INHIBIT Output provides a logic pulse when the internal pile-up rejection logic detects a distortion of the input
signal due to pile-up.
