Modulation Operation
Giga-tronics 2500B Series Microwave Signal Generators
Page 50
Operation Manual, Part Number 34737, Rev C, June 30, 2011
5.5
Generate an Internally Modulated FM Signal
The procedure below describes how to generate an internally-modulated FM signal with the following characteristics:
Carrier frequency = 1.00 GHz
Carrier power = 1.00 dBm
Deviation = 200 Hz
Rate of FM modulation = 50 kHz
Modulating waveform = sine wave
NOTE:
The example procedure in this section uses specific parameters to illustrate how to setup the 2500B. You can use
this procedure for real-life situations by simply changing the parameters to fit your needs.
Equipment and Materials
Cables and connectors for connecting device to be tested to the 2500B RF Output
Table 22: Generate an Internally Modulated FM Signal
Generate an Internally Modulated FM Signal
Step
Action
1.
Verify that the RF output is NOT energized by checking the RF on/off indicator on the front of the
2500B (see Figure 3 on page 11). If the indicator is lit, press the
button to de-energize
the RF output.
2.
Connect the RF output on the 2500B as needed.
3.
Press the
menu button.
4.
In the CW menu, select 1.00 GHz for the frequency of the FM signal:
4.
Press
Frequency.
5.
On the numeric keypad on the front panel of the 2500B, enter 1.
6.
Press the GHz Units button (next to the numeric keypad) to enter the new frequency.
NOTE:
You can also use the
keys and
to change the frequency.
5.
In the CW menu, select 1.00 dBm for the power level of the FM signal:
1.
Press
Power.
2.
On the numeric keypad on the front panel of the 2500B, enter 1.
3.
Press the GHz (nSec/dBm) Units button (next to the numeric keypad) to enter the new power
level.
NOTE:
You can also use the
keys and
to change the power level.
6.
Press the
Menu button. The FM Main Menu opens in the display.
7.
In the FM Main Menu, press
FM Int Menu. The FM — Internal Waveform menu opens
8.
Press
FM to switch FM on.
Soft Button
Soft Button
FM
Soft Button
Soft Button
CW
RF ON
