Metrix GX 305, Руководство пользователя, Страница: 37 / 62

Fonction SHIFT K
Function Generators VI - 37
Shift Keying function “SHIFT K” (GX 320 only)
The SHIFT KEY function can work with the signal frequency (FSK) or phase
(PSK):
- “FSK” is a frequency commutation piloted either INTernally or EXTernally:
switching from Freq
START
to Freq
END
and vice versa.
- “PSK” is a phase jump with value Phase
START
and Phase
END
, piloted by a
command signal that can be INTernal or EXTernal.
At each change in signal status the programmed phase value (Phase
START
or
Phase
END)
is added to the current phase.
•
With an INTernal source the command signal has a frequency of 1 kHz. It
can be viewed on the generator SWEEP OUT terminal.
•
With an EXTernal source the pilot signal is a TTL signal (0 - 5 V) with a
frequency of < 1 MHz from the generator VCG IN terminal.
Connections
FSK mode selection
Pressed successively, “F” mode selection (Frequency).
PSK mode selection
Pressed successively, “P” mode selection (Phase).
Selection of the
source
Pressed successively, source selection:
INTernal or
EXTernal .
TTL output
signal
TTL input command signal from an
EXTernal F < 1 MHz
Output command signal from an
INTernal source
Main output signal
INTernal FSK:
Channel1: MAIN OUT
Channel2: VCG IN Sweep out
INTernal PSK:
Channel1: MAIN OUT
Channel2: VCG IN Sweep out