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:

•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.

•Determine the pulse repetition rate of the signal, then use ‘Ihble 5-5 to determine the spectrum analyzer’s sweep-time setting.

N O T E

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

 

Gate

Resolution

Gate

Video

 

 

 

Delay

Bandwidth

length

Bandwidth

1 0

,us

 

5

ps”

1

MHz

3

PS

1

 

MHz

50

ps

 

2 5

ps

1 0 0

kHz

1 3

ps

1 0 0

 

kHz

6 3 . 5

ps

 

3 2

ps

1 0 0

kHz

1 6

ps

1 0 0

 

kHz

1 0 0

/&s

 

50

,us

1 0 0

kHz

2 5

ps

1 0 0

 

kHz

5 0 0

ps

 

250

,us

1 0

kHz

1 2 5

ps

I

O

kHz

1

ms

 

500

ps

I O

kHz

250

p

I

O

kHz

5

ms

 

2 . 5

m s

1

kHz

1 . 2 5 ms

1

 

kHz

1 0

m s

 

5

ms

1

kHz

2 . 5

m s

1

 

kHz

1 6 . 6

m s

 

6 . 3

ms

1

kHz

4

m s

1

 

kHz

3 3

m s

 

1 6 . 5 m s

1

kHz

6

m s

1

 

kHz

5 0

m s

 

2 5

ms

1

kHz

1 3

ms

1

 

kHz

1 0 0

m s

 

5 0

m s

1

kHz

2 5

m s

1

 

kHz

1130 m s

 

6 5

m s

1

kHz

3 3

m s

1

 

kHz

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.

5-52