Inhaltsverzeichnis
Werbung
MainMenu 2 and its functions
External source:
HM 8131-2:
With AM the maximum selectable output voltage is 10
V
. If the amplitude selcted is less an offset may be
pp
STOP
STOP
added. Example: amplitude 8 V
advisable not to combine both. The output is protected
against short-circuit or overload for about 30sec. Overload
means: extern voltage(ac + dc) >15V or load < 50 ohms. In
worst case the final stage will be damaged.
FSK frequency shift keying
FSK-Parameters HM8131-2
** FSK PARAMETERS **
F0
F1 On
This modulation type is characterized by the change between
two frequencies. The first is called [F0] or carrier frequency, the
second [F1] or hop frequency. The frequencies of both may be
selected independently. The jump between both will be dependent
on the signal on the trigger input terminal TRIG.INP
The button [F0] of the menu button group
in which the carrier frequency can be chosen. The button [F1]
will call the menu for the adjustment of [F1]. The FSK function
will be activated by pressing [ON] and deactivated by pressing
[OFF].
STOP
While FSK is activated the menu FSK can not be left. It
is therefore advisable to set the parameters in advance.
It is necessary to terminate FSK in order to be able to
TiPP
return to the main menu.
70
Downloaded from
www.Manualslib.com
V
= 4.00 Vp, 1 kHz, 2 V/cm
in
V
= 10 Vp, 20 kHz, 5 V/cm,
o
35 % modulation selected
generator overmodulated
and offset –2 V. It is
pp
Off
F1:
4.0000000 kHz
- val +
< cur >
F1: 20.0000000 kHz
- val +
< cur >
will call the menu
manuals search engine
FSK-Signal 500 Hz / 2 kHz
The picture shows a 5 V TTL square wave signal and the
associated FSK signal. The carrier frequency is 500 Hz
and corresponds to a High. The hop frequency is 2 kHz and
corresponds to Low.
PSK Phase Shift Keying
PSK Parameters HM8131-2
** PSK PARAMETERS **
Ph0 Ph1 On
The modulation type PSK generates a signal which changes
phase upon command of a trigger signal . Selection and parameter
setting is analogous to the procedure described for FSK. Both
phase values may be set from 0 to 359.9 degr. and are independent
from the signal at the terminal Trig.OUTPUT
The menu item [Ph 0] determines the phase during the High level,
the item [Ph 1] the phase during the Low level of the trigger signal.
Button [Ph 0] within the button group
the [Ph 0] value is selected, button [Ph 1] the corresponding one
for Ph 1. Pressing [ON] activates, [OFF] deactivates the function.
STOP
.
The menu PSK can not be left as long as this function is
activated, return to the main menu requires deactiva-
tion. It is therefore advisable to select the signal function
before activating PSK.
TiPP
Examples:
Fig. 1 shows a square wave signal of 5 V TTL level and a sine wave
the zero crossings of which are coincident with the slopes of the
former. This signal is hence not phase shifted. The PSK signal has
a phase shift of 0 during the High level and of 70 degr. during the
Low level.
Off
Phase1: 180.0 deg
- val +
< cur >
Phase0:
45.0 deg
- val +
< cur >
on the rear panel.
calls the menu in which
Subject to change without notice
Werbung
Kapitel
Inhaltsverzeichnis
