57
Subject to change without notice
Main menu 2 and its functions
Main menu 2 and its functions
See next page for an overview.
Main Menu 2
The main menu 2 allows access to 3 other menus. The button
below the arrow calls main menu 1.
Modulation menu (types of modulation)
The HM 8131-2 features the modulation types: AM (amplitude
modulation), FSK (frequency shift keying) and PSK (Phase shift
keying). They can be selected in the main menu 2 at “Mod“.
Amplitude modulation
First AM has to be chosen, then the modulation depth from 0 to
100 % which can be done in 1 % steps. Either internal or external
modulation is possible. The modulation depth can be set by the
menu buttons
, the knob or the keyboard . If the key-
board is used the value keyed in will be stored by pressing the
button (MHz/%). The AM function will be activated by pressing
MAIN Menu2 HM8131-2
** OPTIONS MENU 1 **
Com Mcard Memo -->
** OPTIONS MENU 2 **
<-- Beep Enco -->
** OPTIONS MENU 3 **
<-- Ref Disp -->
** OPTIONS MENU 4 **
Lcd Date <--
*** MAIN MENU 2 ***
Mod Phi Option <--
Phase : 0.0 deg
- val + < cur >
* MODULATION MENU *
AM FSK PSK
Modulations Menu HM8131-2
Phase1: 180.0 deg
- val + < cur >
Phase0: 45.0 deg
- val + < cur >
* MODULATION MENU *
AM FSK PSK
** PSK PARAMETERS **
Ph0 Ph1 On Off
F1: 4.0000000 kHz
- val + < cur >
F1: 20.0000000 kHz
- val + < cur >
** FSK PARAMETERS **
F0 F1 On Off
** AM PARAMETERS **
- 0% + AMi AMx
AM Parameters HM8131-2
** AM PARAMETERS **
- 0% + AMi AMx
either the menu button [AMi] or [AMx] for internal resp. external
modulation. An arrow in front of the modulation type selected
will indicate which was activated. The function activated will be
deactivated by pressing the same button again.
Internal modulation source
The internal source generates a 1 kHz 1.0 V
rms
signal. The
modulation depth selected will determine the shape of the
output signal.
The picture shows: internal source, Vo = 10 V
pp
, f = 20 kHz,
100 % modulation, scope 5 V/cm.
The maximum selectable output voltage in AM
mode is 10.00 V
pp
. In case a larger value is entered
into the keyboard a warning signal will sound, the
former value remains valid. It is not possible to en-
ter illegal values via the knob or the menu buttons
. With 100 % modulation and 10.00 V
pp
selected
HINT
the total output signal will be 20 V
pp
.
External source
An external modulation voltage can be connected to the rear
panel terminal AM IN
. The waveform can be any. However,
the indication of the modulation depth will be only correct for a
1819
17
16 1520
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