Modulation Operation
Giga-tronics 2500B Series Microwave Signal Generators
Page 42
Operation Manual, Part Number 34737, Rev C, June 30, 2011
Table 20: Generate an Externally Modulated AM Signal
Generate an Externally Modulated AM 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.
On the rear of the 2500B, locate the AM IN connector (see Figure 6 on page 19).
4.
Connect the external AM modulation source to the AM IN connector (see Table 51 on page 95 for
specifications for the external AM signal).
5.
Press the
menu button.
6.
In the CW menu, select 1.00 GHz for the frequency of the AM signal:
1.
Press
Frequency.
2.
On the numeric keypad on the front panel of the 2500B, enter 1.
3.
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.
7.
In the CW menu, select 1 dBm for the power level of the AM 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.
8.
Press
to display the AM Main Menu (see Figure 16 on page 36).
9.
Press
AM Ext Menu.
10.
Press
AM to switch AM mode ON.
11.
Press
Sensitivity.
12.
Adjust the sensitivity to 50 %/Volt:
1.
On the numeric keypad, enter 50.
2.
Press the kHz/mSec/ % Units button (see Figure 3 on page 11).
NOTE:
You can also set the sensitivity by the using the
keys and
.
13.
Set the external AM modulation source for the following output:
Frequency: 50 kHz
Amplitude: 1 V peak (or 2 V peak-to-peak)
Output waveform: sine wave
Soft Button
Soft Button
Soft Button
AM
Soft Button
Soft Button
CW
RF ON
