Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 39 / 136

Testing Performance
3
90000 A-Series Service Guide 39
Time Scale Accuracy (TSA) Test
This procedure verifies the maximum TSA specification for the oscilloscope.
Description
TSA refers to the absolute accuracy of an oscilloscope’s time scale. Because TSA
depends directly on frequency of a crystal oscillator, it is comprised of two
components: an initial accuracy component and an aging component.
The initial accuracy component applies to the oscilloscope’s accuracy immediately
after a time base calibration, whether performed at the factory, by a customer, or
by a Keysight service center. The aging component scales linearly from the time
since the last time base calibration, and adds to the initial accuracy component.
Equipment Required
Description Critical Specifications Recommended Model/Part #
Synthesized sine
wave source
Output Frequency: ≥ 10 MHz
Output Amplitude: 0 dBm
Frequency Resolution: 0.1 Hz
Keysight E8257D PSG
10 MHz frequency
reference
Output Frequency: 10 MHz
Output amplitude: 0 dBm
Absolute Freq. Error: <
± 0.01 ppm
Keysight 53132A opt. 012
frequency counter
SMA cable 50
Ω
characteristic impedance
SMA connectors
Max frequency:
≥
50 MHz
Keysight 8120-4948
RF cable 50
Ω
characteristic impedance
BNC (m) connectors
Max Frequency:
≥
50 MHz
Keysight 8120-1840
Adapters, assorted 3.5 mm (f) to Precision BNC (m) Keysight 54855-67604