Cronologic Ndigo Crate Betriebsanweisung PDF herunterladen (Seite 20)

its output after the speciﬁed delay.

To send this pulse to the trigger block, the gating block must be enabled in the trigger block’s

AND matrix and the ONE trigger source must be selected.

2.4.4 Auto Triggering Function Generator

Some applications require periodic or random triggering. Ndigo250M’s function generator pro-

vides this functionality.

The delay between two trigger pulses of this trigger generator is the sum of two components:

A ﬁxed value M and a pseudo random value given by the exponent N.

The period is

T = 1 + M + [1...2

] (2.1)

samples.

This allows to monitor input signals at times the current trigger conﬁguration does not trigger,

e. g. to get base line information in mass spectrometry applications. It can also be used to

determine a suitable threshold level for the trigger by ﬁrst getting random statistics on the input

signal.

2.4.5 Timestamp Channel

The timestamp channel produces a stream of small packets that denote the time of the trigger

event. An arbitrary set of trigger sources can be selected in the trigger matrix to cause the

creation of a packet.

The packets have a ﬁxed length of 16 bytes. The format is described on page 43. The length

ﬁeld of the packet contains a 32 bit pattern that contains the levels of all trigger sources at the

time of the trigger event except for the period monitor. Only one packet is created, no matter

how many trigger sources caused the timestamp channel to trigger. The timestamp channel can

be gated.

2.4.6 Data Lookup Table

This feature ist not available for the Ndigo250M-14.

cronologic GmbH & Co. KG 16 Ndigo250M-14 User Guide

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 56 57

Keine Kommentare

Cronologic Ndigo Crate Betriebsanweisung Seite 20