3
Controls, connectors and indicators
3.1 Front panel
Fig. 3.1: The Front Panel
F
ComTec GmbH
9
CFT – CFRR – LEFT selects
- Constant fraction trigger
- Constant fraction with
slow rise time reject
- leading edge mode
Threshold sets threshold
from -5mV to -1,0V
for signal acceptance
Delay for external delay cable
used in CFT and CFRR modes
Walk adjust varies
zero crossing discriminator
adjustment
Positive output connectors,
each supplies a TTL logic
signal into a 50 Ohms load
Width control sets positive
output signal width -
also sets signal dead time
Negative output connectors
each supplies -32mV into
50 Ohms load
Rate LED indicates discriminator
count rate: yellow to 5kHz
orange 5 -10 kHz
red above 10 kHz
Walk inspect allow observation
of zero crossing discriminator
adjustment
Input accepts
-5mV to -3.0V linear pulses
min. input pulse width = 700ps
