Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 15 / 136

Calibration
2
90000 A-Series Service Guide 15
Running a User Calibration
The user calibration uses signals generated in the oscilloscope to calibrate
channel scale, offsets, and trigger parameters.
When to perform a user calibration:
• at least once a year
• when you replace an acquisition board or the hard drive
• when the oscilloscope’s operating temperature (after the 30-minute warm-up
period) is more than ±5 °C different from that of the last calibration
Equipment required
Calibration time
It takes approximately 1 hour to run the user calibration on the oscilloscope,
including the time required to change cables from channel to channel.
NOTE
The oscilloscope must be warmed up (with the oscilloscope application running) for at least
30 minutes at ambient temperature before starting the calibration procedure. Failure to allow
warm up may result in inaccurate calibration.
Equipment Critical Specifications Keysight Part Number
Adapters (2 supplied with
oscilloscope except for the
DSO90254A)
3.5 mm (f) to precision BNC
No substitute
Keysight 54855-67604
Cable assembly 50
Ω
characteristic impedance BNC (m)
connectors, 36 inches (91 cm) to 48
inches (122 cm) long
Keysight 8120-1840
Cable (supplied with
oscilloscope except for the
DSO90254A, which can use
a good-quality BNC cable)
No substitute Keysight 54855-61620
10 MHz signal source
(required for time scale
calibration)
Frequency accuracy better than 0.4 ppm Keysight 53131A with opt.
010