Surface Concept Preamplifier-CFD, Manual

11

Preamplifier-CFD Manual

4.2  Input/Output Features

Preamplifier Input Signal:

Polarity of Input Signal:
Impedance:

4.2.1 Input Features

2mV - 1V (BNC)

(depending on gain setting)

negative or positive  (switchable)

50Ohm

CFD Output Signal per Channel:
Pulse Width of Output Signal (typ.):

Monitor Output: 

4.2.2 Output Features

1 LVTTL (BNC), 1 NIM (LEMO)

2.4 (LVTTL), 3ns (NIM)

1 analogue (BNC)

Input Signal Frequency (max.):
CFD Jitter (max.):
CFD Walk (typ.):

Device propagation delay (typ.):

4.2.3 Measurement Parameters

40MHz

20ps

< 40ps  (for 20dB amplitude range and while  

ambient temperature varies less then 5K)

6.5ns

4.3  CFD Adjustment

The CFD Threshold can be adjusted manually by turning the corresponding potentiometer (marked “Th” 

on the front panel). The threshold is getting more sensitive when turning the potentiometer clockwise. It 

can be monitored on the corresponding sockets (no. 13 & 14) on the front panel (see

 Figure 1 & 2

).

4.3.1 Adjustment of CFD Threshold

The Zero Offset can be adjusted by turning the corresponding potentiometer (marked “Z” on the front 

panel). The Zero Offset is getting more positive when turning the potentiometer clockwise. It can be              

monitored on the corresponding sockets (no. 12 & 14) on the front panel (see

 Figure 1 & 2

).

4.3.2 Adjustment of Zero Offset