Agilent Technologies HP 8642A/B Spécifications Page 274

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Time Record Length
The Time Record Length is also determined by the HP 3561A Frequency
Span and cannot be set independently. The Time Record Length is
the approximate time it takes the analyzer to measure and record data
for one measurement of the Measurement Range. Table 5-1 shows the
relationship between span, record lengths, and display resolution for the
HP 3561A.
Table 5-1. Frequency Spans, Time Record Lengths, and
Display Resolution for the HP 3561A
Frequency
Span (Hz)
100 000
50 000
25 000
20 000
12 500
10 000
6 250
5 000
4 000
3 125
2 500
2 000
1 250
1 000
800
625
500
400
250
200
160
125
100
80
50
40
* Zero start
Time Record
Length (Sec.)
0.004
0.008
0.016
0.020
0.032
0.040
0.064
0.080
0.100
0.128
0.160
0.200
0.320
0.400
0.500
0.640
0.8
1.0
1.6
2.0
2.5
3.2
4.0
5.0
8.0
10.0
only
Display
Resolution (Hz)
250
125
62.5
50
31.25
25
15.625
12.5
10
7.8125
6.25
5
3.125
2.5
2
1.5625
1.25
1
0.625
0.5
0.4
0.3125
0.25
0.2
0.125
0.1
Frequency
Span (Hz)
32
25
20
16
10.0
8
6.4
5
4
3.2
2.5*
2
1.6
1.28
1*
0.8
0.62
0.4*
0.32
0.256
0.16
0.128*
0.064*
0.0512*
0.0256*
0.01024*
Time Record
Length (Sec.)
12.5
16.0
20.0
25.0
40.0
50.0
62.5
80.0
100.0
125.0
160.0
200.0
250.
312.5
400.
500.
625.
1000.
1250.
1562.5
2500.
3125.
6250.
7812.5
15625.
39062.5
Display
Resolution (Hz)
0.08
0.0625
0.05
0.04
0.025
0.02
0.016
0.0125
0.01
0.008
0.00625
0.005
0.004
0.0032
0.0025
0.0020
0.0016
0.001
0.0008
0.00064
0.0004
0.00032
0.00064
0.000128
0.000064
0.0000256
FFT Segmnts 5-17
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