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Making Measurements Using Spectrum Analyzer Mode
Using the Time-Gated Spectrum Analyzer Capability Without the Gate Utility (Option 107
only)
To use
‘lkble
5-4 and Table 5-5:
l Determine the pulse width of the signal you want to measure, then use
able
5-4 to determine the gate delay, resolution bandwidth, gate length,
and video bandwidth spectrum analyzer settings.
l Determine the pulse repetition rate of the signal, then use
‘Ihble
5-5 to
determine the spectrum analyzer’s sweep-time setting.
NOTE
The peak detection mode is recommended for making gated measurements.
Table 5-4.
Gate Delay, Resolution Bandwidth, Gate length, and Video Bandwidth Settings
Pulse width
b-1
10
,us
50
ps
63.5
ps
100
/&s
500
ps
1 ms
5 ms
10 ms
16.6 ms
33 ms
50 ms
100 ms
1130
ms
Gate
Delay
5
ps”
25
ps
32
ps
50
,us
250
,us
500
ps
2.5 ms
5
ms
6.3
ms
16.5 ms
25
ms
50 ms
65 ms
When using the short gate delays, you may notice the gate delay time jitter by
fl
ps.
This jitter
is due to the spectrum analyzer’s 1 MHz gate clock, and it does not indicate a problem.
Resolution
Bandwidth
1 MHz
100
kHz
100
kHz
100
kHz
10
kHz
IO kHz
1
kHz
1
kHz
1
kHz
1 kHz
1 kHz
1
kHz
1
kHz
Gate
length
3
PS
13
ps
16
ps
25
ps
125
ps
250
p
1.25
ms
2.5
ms
4
ms
6
ms
13
ms
25
ms
33
ms
Video
Bandwidth
1
MHz
100 kHz
100 kHz
100 kHz
IO kHz
IO kHz
1
kHz
1
kHz
1
kHz
1
kHz
1 kHz
1
kHz
1
kHz
5-52