BURST Function
Function Generators
XII -
51
BURST Pulse burst function (GX 320 only)
The BURST function generates sets of pulses:
•
Using an INTernal source the user must enter a generation period and
the number of pulses to generate.
The number of pulses Num is automatically limited so that the number
cannot be greater than the number of pulses a period can contain.
•
Using an EXTernal source the pulse bursts are piloted:
- either by an external TTL with a frequency of less than 10 kHz on VCG
IN
- or manually by pressing the ‘MODE’ key.
The minimum authorised window time is 2 µs: the number of pulses is defined
as follows:
Num
min
≥
F*2µs where Num
min
(whole
number
≥
1) is the minimum number of
authorised pulses and F is the programmed
pulse frequency.
Changing the frequency can cause the modification of the
programmed Num value in order to obey this rule.
Example
if F = 2.6 MHz, then F
*
2 µs = 5.2
the minimum authorised value for NUM
min
= 6.
if F = 2 MHz, then F
*
2 µs = 4
the minimum authorised value for NUM
min
= 4.
Connections
Selection of the
BURST source
Pressed successively selects the source:
INTernal
or
EXTernal
.
Num = number of pulses
TTL signal on VCG_IN
Num = number of pulses
Time = generation period
TTL OUT
in EXT:
TTL command input
MAIN OUT