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4-8
4.1.9
Time Interval A-B Test
4.1.9.0.1
Set the 2251A to its home state. Select Time Interval A-B as the measurement mode,
50 ohms for input A input impedance, Common mode for inputs A and B and
external frequency standard.
(Command String: IP TI ALI BCC B1)
If Option 11 is installed connect the 2251A internal reference output to the external
signal source 10 MHz Input. Configure the external signal source to accept the
10MHz reference from the 2251A.
(Command String: IP TI ALI BCC)
4.1.9.0.2
Connect the 2251A to the signal generator as shown in Figure 4-6. Set the signal
generator to 10 MHz, 0 dBm.
Figure 4-6, Time Interval A-B Test Configuration
4.1.9.1
Set the counter input trigger slopes as shown in Table 4-6 and verify that the
counters measurement result is as given in Table 4-6.
Input A
Input B
Result
Tolerance
Slope
Slope
+
+
0 ns
± 2ns
-
+
50 ns
± 2ns
-
-
0 ns
± 2ns
+
-
50 ns
± 2ns
Table 4-6, Time Interval A-B Test Performance Limits
4.1.9.2
Disconnect the test equipment.
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Содержание 2251A
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