Agilent Technologies Infinium DCA 86100A, Service Manual

Page: 71 / 268

4-21
Performance Verification
Time Base Accuracy Test
Time Base Accuracy Test
Measure the accuracy of the time base circuitry. There is a 4 ns ramp circuit that does not always
line up with the 250 MHz oscillator and causes discontinuities in the waveforms measured. The
discontinuities are reduced to be within spec by performing a time base adjustment.
Equipment List
• 83712B 20 GHz Synthesized CW generator opt 1E1, 1E5, 1E8, 1E9
• 8133A pulse generator
• 15438A 2000 ps Time Transition Converter
• RF cables and adaptors as necessary
• DCA with an 83483A module in the left slot (86100X unit)
Manual Procedure Connection Setup:
1 Connect the 10 MHz reference output of the 83712B to the external input of the 8133A.
2 Connect the 15438A to the channel 2 output of the 8133A.
3 Connect the other end of the 15438A to the front panel trigger input of the DCA.
Table 4-3. Timebase Test Limits
Source
Frequency Source
Power Horizonta
l Scale/div Horizonta
l Delay Expected
Result Min Test
Limits Max Test
Limits
19.98 GHz -8 dBm 10 ps 24 ns 50 ps 41.95 ps 58.05 ps
19.98 GHz -8 dBm 10 ps 27.95 ns 50 ps 41.95 ps 58.05 ps
19.98 GHz -8 dBm 10 ps 35.95 ns 50 ps 41.95 ps 58.05 ps
19.98 GHz -8 dBm 10 ps 59.95 ns 50 ps 41.95 ps 58.05 ps
10 GHz -8 dBm 50 ps 24 ns 100 ps 91.9 ps 108.1 ps
5 GHz -8 dBm 100 ps 24 ns 200 ps 191.8 ps 208.2 ps
2 GHz -8 dBm 200 ps 24 ns 500 ps 491.5 ps 508.5 ps
1 GHz -8 dBm 500 ps 24 ns 1 ns 991 ps 1009 ps
500 MHz -8 dBm 1 ns 24 ns 2 ns 1.99 ns 2.01 ns
200 MHz -8 dBm 2 ns 24 ns 5 ns 4.987 ns 5.013 ns
100 MHz -8 dBm 5 ns 24 ns 10 ns 9.982 ns 10.018 ns
50 MHz -8 dBm 10 ns 24 ns 20 ns 19.972 ns 20.028 ns
20 MHz -8 dBm 20 ns 24 ns 50 ns 49.942 ns 50.058 ns