HP 54520 Series Service Manual page 58

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Chapter 3: Testing Performance
To test time measurement accuracy
The A Time should read:
Instrument Reading Min Reading Max Reading
HP 54520A 395 ns £419.75 ps 394.580 ns 395.420 ns
HP proeh aad 395 ns + 219.75 ps 394.780 ns 395.220 ns
Record the minimum and maximum readings in the Performance Test Record.
Select measure and set statistics to off.
Press Stop/Single (to stop acquisition), then press Single once.
Set the horizontal scale to 1.00 ps/div.
Press Define meas _, select define, and change edge # 11 to edge # 101.
The A Time should read 3.94999 jis +4.198 ns: minimum 3.9458 us and maximum
3.9542 us. Record the reading in the Performance Test Record.
Change edge # 101 to edge # 201.
The A Time should read 7.89998 pts +4.395 ns: minimum 7.8956 Ls and maximum
7.9044 us. Record the reading in the Performance Test Record.
If the test fails
Timing failures are caused by a defective main assembly. However, before troubleshooting the
oscilloscope, be sure signal sources are not at fault. While catastrophic failures are usually
caused by an instrument failure, marginal timing failures are usually caused by test equipment
inaccuracies or procedural errors.
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