Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 16 / 136

16 90000 A-Series Service Guide
2
Calibration
Procedure
1
Let the oscilloscope warm up before running the self calibration.
The self calibration should be done only after the oscilloscope has run for 30
minutes at ambient temperature. Calibration of an oscilloscope that has not
warmed up may result in inaccurate calibration.
2
Click Utilities > Calibration... .
3
Uncheck the Cal Memory Protect box. You cannot run a self calibration if this box
is checked.
4
Click Start Full User Cal , then follow the instructions on the screen. The routine
will prompt you to follow these steps:
a
Disconnect everything from all inputs and Aux Out.
b
Select the level of calibration you want to perform.
• Standard Calibration—Time scale calibration will not be performed. Time
scale calibration factors from the previous time scale calibration will be used
and the 10 MHz reference signal will not be required. The remaining
calibration procedure will continue.
• Standard Calibration and Time Scale Calibration—Time scale calibration will
be performed. This option requires you to connect a 10 MHz reference signal
to channel 1 that meets the following specifications. Failure to use a
reference signal that meets these specifications will result in an inaccurate
calibration.
Frequency: 10 MHz ±0.4 ppm = 10 MHz ±4 Hz
Amplitude: 0.2 Vpeak-to-peak to 5.0 Vpeak-to-peak
Wave shape: Sine or Square