Selecting Level; Selecting Modulations - Hameg HM8134-3X Handbuch Manual

O p e r a t i n g c o n t r o l s
The resolution is 1 Hz. If a value is entered with a higher
resolution, the instrument makes a truncation keeping 1 Hz
resolution.

Selecting level

After pressing the LEVEL key
A new value of the level can be entered from the data keypad
or modifi ed by the digital rotary
context sensitive keys . For more details, refer to the para-
graph "Setting parameters".
The level range is:
– -127 dBm to +13 dBm without amplitude modulation
– -127 dBm to +7 dBm with amplitude modulation
– The resolution is 0.1 dBm.
The level displayed is specifi ed for a load of 50 Ω. The choice of
the unit is made by the keys dBm, mV or μV
the instrument performs a three digits resolution according to
the range (mV/μV/nV).
Caution:
If the AM modulation is activated, the instrument
automatically limits the level to +7 dBm in order to
avoid an excess of the dynamic of the ouput ampli-
fi er.
STOP

Selecting modulations

After pressing the MOD. key
MODULATION MENU MODULATION MENU
AM AM FM FM PM PM
MODULATION MENU MODULATION MENU
<– – FSK FSK PSK PSK
The modulation type is selected by pressing one of the four
context sensitive keys corresponding to:
– AM (Amplitude modulation)
– FM (Frequency modulation)
- PM (Phase modulation)
- FSK (Frequency shift keying)
- PSK (Phase shift keying)
– GATE (Gate modulation)
The return to the previous display is possible by pressing the
PREV. key .
After selecting the type of modulation (FM MENU), the display
shows:
The selection of the parameters for AM/FM/PM is made by
pressing one of the four context sensitive keys
ponding to:
30
Subject to change without notice
, the display shows:
or by one of the four
. For the volt unit
, the display shows:
– –>
GATE GATE
corres-
– The shape of internal modulation signal
– The frequency of the internal modulation signal
– The deviation (or depth in AM)
– The modulation state
The return to the previous display is possible by pressing the
PREV. key .
After selecting the SHAPE option (AM SHAPE MENU), the
display shows:
The shape of the internal modulation signal may be modifi ed
by the context sensitive keys
out by a triangle .
The return to the previous menu is possible by pressing the
PREV. key .
After selecting the Fmod option (AM MENU), the display
shows:
The frequency of the internal modulation signal may be directly
changed by the numeric keypad
rotary or by one of the four context sensitive keys
The return to the previous menu is possible by pressing the
PREV. key .
The frequency range is:
– 10 Hz to 150 kHz:
– 10 Hz to 20 kHz: Triangle, Square, Sawthooth (Step 10 Hz)
The modulation is turned on by pressing the context sensitive
key below the string OFF. One time for turning the internal
source on (INT) and a second time for turning the external
source on (EXT). The active source is pointed out by a triangle
beside the option.The indicator LED of the MOD.OUTPUT is
lighting.
Pressing the context sensitive key
will be deactivated (OFF).
The return to the previous menu is possible by pressing the
PREV. key .
With external AM activated, the only modifi able option is the
modulation depth (see paragraph "Amplitude modulation").
The external modulation frequency for AM must be in the
range:
– 10 Hz to 50 kHz
With external FM or PM activated, several cases are possible:
– DC coupled (DC – 150 kHz)
– AC coupled (10 Hz – 150 kHz)
– Deviation (see corresponding paragraph)
. The active signal is pointed
or modifi ed by the digital
.
Sine (Step 10 Hz)
once again, the modulation