Using the OSICS DFB Module
OSICS User Manual
77
Figure 45: DFB Unit Setup – Modulation Control (On)
3.
Turn the rotary knob to put the cursor before the wanted modulation:
•
ON
for standard modulation.
•
ON INVERTED
for reverse modulation
4.
Press the rotary knob to validate your selection.
Modulation is enabled. In the
System Status
screen, the letter
M
is displayed in the
channel
Info
field of the corresponding module.
5.
To stop the modulation: in the
Control
sub-menu, select
OFF
.
8.5.2
Setting Up Digital (TTL) Modulation Using the Mainframe
Internal Source
Subject
This modulation setting uses the OSICS Mainframe’s built-in internal oscillator as a source
of TTL-level modulated signals (see
). The main purpose of this setting is
to provide simultaneous and synchronous modulation to several modules installed in the
OSICS Mainframe, or to an external device connected to the OSICS Mainframe
Synchro
output connector.
The range of the frequency of the modulation provided by the OSICS Mainframe is
defined to encompass the frequency requirements of all types of OSICS DFB modules.
The frequency settings for the lower and upper bounds may therefore lie outside of the
modulation capabilities of a particular module, in which case the module's own frequency
range sets the modulation specifications.
The OSICS Mainframe signal generator can provide a TTL signal with a repetition
frequency in the range 123 Hz–1 MHz.
The resulting signal-shape of the modulated output power is similar to the internally
modulated pattern of the OSICS DFB, as shown in
.
Procedure
Step 1 – Set the OSICS Mainframe modulation source to INTERNAL:
1.
Access the
Main Setup
menu (see section
Accessing the OSICS Mainframe Main Setup
).
2.
Enter the
Source
sub-menu as follows:
a. Turn the rotary knob to put the cursor before the
Modulation
menu and press
the knob to expand it.
Main
EXIT
1
2
3
4
5
6
7
8
DFB Unit Setup - Modulation control
ESCAPE
▲
TTL Modulation control :
OFF
ON
Select a new value.
ON INVERTED
