Timebase Frequency Accuracy Verification; Table 1-2 Test Record For Rise/Fall Time Verification - Keysight 8990B Service Manual

1 Performance Verification and Adjustments
Table 1-2 Test record for rise/fall time verification
Measured points
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 0.2 μs, Duty cycle: 50% 5.5 ns
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 1 μs, Duty cycle: 50%
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 10 μs, Duty cycle: 50%
Bandwidth: OFF, Power level: 10 dBm, Pulse period: 100 μs, Duty cycle: 50% 5.5 ns

Timebase frequency accuracy verification

The accuracy of the 100 MHz sample clock determines the accuracy of all
measurements that are based on samples taken over time. This test measures the
timebase by dividing the sample clock by 10 (within the meter) and feeding it out
of the trigger output connector, where it can be directly measured by a frequency
counter.
Required test equipment:
– 1 unit of 53132A frequency counter
– 1 unit of Symmetricom 58503B 10 MHz frequency reference source
– 2 units of 1053A BNC cable
System specification:
– ±1.4 ppm
Test procedure
1 Turn on the 8990B and 53132A.
2 Allow the system to warm up for approximately an hour.
3 Connect the 8990B to the PC via USB interface.
4 The test equipment setup is as shown in
34
Measured
Specification
rise time (s)
5.5 ns
5.5 ns
Figure 1-7.
Keysight 8990B Service Guide
Pass/Fail