Performance Verification
Publication 31231, Rev. J, October 2003
4-17
Maximizing Delay Discriminator Output
Obtaining a six division change on a 5 mV scale may be difficult to obtain for a 1 MHz change in
frequency. Increasing output power will improve the output of the discriminator. The output of the
UUT can be adjusted to levels as high as +13 dBm or higher for the 4 to 8 GHz frequency band. The
output performance of discriminator is improved with a very high cable length ratio. Cable length ratios
of 16 to 1 (48 inches to 3 inches) will produce a large number of frequency nulls within the 4 to 8 GHz
frequency band.
Optimal Test Performance Null Selection
The maximum deviation of the Frequency Modulation test is ±10 MHz. The rate of change for the
output voltage per unit frequency (
∆
V/
∆
F) must remain constant (linear) for the ±10 MHz deviation
range. Rate changes within this deviation range will result in a non-symmetrical waveform and will
produce invalid test results.
Identifying an optimal frequency null is achieved by sweeping the frequency through the frequency
range of the test and observing the Delay Discriminator waveform on an oscilloscope.
Recommended Test Equipment (FM)
•
Delay Discriminator
•
Digital Oscilloscope
•
Pulse Generator with 1 shot Capability
•
BNC Cables and Tee
Recommended Configuration
1.
Connect the input of the delay discriminator to the RF output of the 12000A and the output to
the digital scope.
2.
Set the 12000A to Sweep Mode with the following settings:
a.
Start Frequency: 4 GHz
b.
Stop Frequency: 8 GHz
c.
Sweep Type: Ramp
d.
Sweep Time: 900 msec
e.
Repeat Mode: Single Sweep
f.
Trigger Type: Trigger in BNC
g.
Power: +10 dBm
3.
Connect the output of the pulse generator to the External Trigger Input or second channel of
the digital scope and the Trigger In of the 12000A.
4.
Set the trigger selection of the digital scope to the port where the trigger signal will be detected
(Use the BNC Tee at this port).
NOTE:
Increasing the number of frequency nulls increases the rate of change of the
output voltage per unit frequency as the output transitions through the frequency null.
☛
Summary of Contents for Series 12000A
Page 3: ...DECLARATION OF CONFORMITY ...
Page 4: ......
Page 11: ...Preface Publication 31231 Rev J October 2003 vii ...
Page 14: ...Series 12000A Microwave Synthesizers x Publication 31231 Rev J October 2003 ...
Page 18: ...Series 12000A Microwave Synthesizers xiv Publication 31231 Rev J October 2003 ...
Page 20: ...Series 12000A Microwave Synthesizers xvi Publication 31231 Rev J October 2003 ...
Page 22: ...Series 12000A Microwave Synthesizers xviii Publication 31231 Rev J October 2003 ...
Page 24: ...Series 12000A Microwave Synthesizers xx Publication 31231 Rev J October 2003 ...
Page 62: ...Series 12000A Microwave Synthesizers 1 38 Publication 31231 Rev J October 2003 ...
Page 234: ...Series 12000A Microwave Synthesizers B 2 Publication 31231 Rev J October 2003 ...
