4.2.10
Pulse Modulation Rise and Fall Time Test
Specification
Rise/fall Time:
<10 ns
Description
A crystal detector is connected to the GT 9000, terminated in 50
Ω
, and monitored with an
oscilloscope.
☛
NOTE: It is very important to use either the specified detector or one with similar
rise-time characteristics. Even when terminated in 50
Ω
with a short cable, the
detector parameters can markedly influence the measurement.
Procedure
1.
Connect the equipment as shown in the figure. The cable from the detector to the
oscilloscope should be kept as short as possible.
2.
Press [SHIFT] [RESET] on the UUT and set the frequency to the first Test Data Sheet
frequency which is within the operating range of the instrument.
3.
Enable the pulse modulation of the UUT by pressing [PM] [MODE..(INT)]
[SCROLL..(RATE)] [1] [MHZ] [SCROLL..(WIDTH)] [.5] [US] [ON].
4.
Set the oscilloscope to 5 mV/div and using the RF Level control of the UUT, adjust the
peak to peak oscilloscope display to fall on the dotted lines on the screen (100% and
0%). Adjust the oscilloscope sweep time to 5 ns/div. Measure and record the rise and
fall times between the 10% and 90% points.
5.
Repeat step 4 for each of the Test Data Sheet frequencies which is within the operating
range of the instrument.
Equipment Required
Oscilloscope
Crystal detector
Figure 4-6. Pulse Modulation Rise/Fall Time Test
Model GT 9000 Microwave Synthesizer
4-20
Manual No. 120AM00250, Rev C, September 1998
Summary of Contents for GT 9000
Page 12: ...Series GT 9000 Microwave Synthesizers x Manual No 120AM00250 Rev C September 1998 ...
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Page 18: ...Series GT 9000 Microwave Synthesizers xvi Manual No 120AM00250 Rev C September 1998 ...
Page 20: ...Series GT 9000 Microwave Synthesizers xviii Manual No 120AM00250 Rev C September 1998 ...
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