Technical data
Performance Verification
2400 Series Operation Manual, 33237 Revision A, May 2004 4-25
4.4.3.3.2 Wide Mode FM Accuracy and Maximum Deviation Test Proce-
dure
1. Connect the output of the UUT to FM discriminator. The output of the discriminator is connected
to the oscilloscope.
2. Connect the function generator to the external FM input of the UUT. Set the function generator
to the following settings:
1. Rate: 5 kHz
2. Waveform: Sine wave
3. Output: 2 Vpp into 50 ohms
3.Set the level of the UUT to +13 dBm, activate the RF output of the UUT and set the external FM set-
ting of the UUT to the following:
1. FM State: Off
2. Mode: Wide
3. Sensitivity: 20 MHz/volt
3. Set the UUT frequency that will produce a 0 volt output from the FM discriminator.
4. Adjust the frequency of the UUT ±20 MHz. The output of the discriminator must exceed ±3 divi-
sions on the oscilloscope.
5. Adjust the vertical gain of the oscilloscope so that a 20 MHz frequency change from the zero
crossing frequency of the UUT results in a three-division change on the oscilloscope.
6. Set the UUT frequency back to the test frequency and toggle the FM state to ON. Check that the
peaks of the oscilloscope display are within ±0.15 volts of the 3 divisions (±5% Accuracy).
7. Vary the rate of the function generator from 1kHz to 3 MHz and check that the output of the dis-
criminator is within 4 to 8 divisions (3 dB bandwidth) of the oscilloscope.
8. Repeat steps 4 through 8 for the remaining frequency test points.