Hameg HM8135-X, Руководство пользователя

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34
Subject to change without notice
S e t t i n g t h e c o n f i g u r a t i o n
Psk0: –3,14 rad; Psk1: 3,14 rad; Fmod: 1 kHz; Level TTL
Psk0: 0 rad; Psk1: 3,14 rad; Fmod: 1 kHz; Level TTL
GATE modulation
The GATE modulation is made by sampling the output carrier
with a logic signal (GATE) and is characterised by:
– Duty cycle
– Rise / Fall time
– Delay
time
The GATE signal (TTL level) is applied to the GATE INPUT
at the rear panel. When the GATE signal is at the state ACTIVE
(optional level 1 or 0), the carrier is present at the output.
After selecting GATE (MODULATION MENU) with the four con-
text sensitive keys
, the display shows:
Press one of the four context sensitive keys for selecting the
active level and for turning the gate ON or OFF. Two triangles
point out the options , , and ON or OFF.
The return to the previous menu is possible by pressing the
PREV. key
and the return to the main display by pressing
the ESC key .
The GATE modulation can be active with another modulation
(for example the GATE modulation with AMsin modulation and
Fmod = 10 kHz)
Example 14 (Fgate: 250Hz Sqr):
GATE
CH1—> AM signal (depth: 50%) and GATE modulation
CH2—> signal with GATE modulation
Setting the confi guration
Selecting step
After pressing the STEP function key , the display shows:
Now the step type is selected by pressing one of the four context
sensitive keys
. If the parameter is already selected, the step
type can directly be modifi ed by pressing the STEP function key
. Press again the STEP key to go back to previous display.
A new value of the step can be entered from the data keypad
or modifi ed by the digital rotary control or by one of the
four context sensitive keys . For more details, refer to the
paragraph ”Setting parameters“.