Chapter 3: Testing Performance
To test time scale accuracy
59
To test time scale accuracy
Description
TSA (time scale accuracy) refers to the absolute accuracy of the oscilloscope's time
scale. Since TSA depends directly on the 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 scope's accuracy on the date of it's shipment to the
customer. The aging component scales linearly from the scope's manufacture date and
adds to the initial accuracy component.
Specifications
TSA is published as a warranted specification, expressed by the following formula.
TSA ≤ ±(15 + 2 • (Years Since Manufacture)) ppm
You can determine the year of manufacture from the oscilloscope’s serial number. See
"Year of Manufacture" on page 11.
This procedure verifies the maximum TSA specification for the oscilloscope.
Equipment Required
Equipment Critical Specifications Recommended Model/Part
Synthesized sine
wave source
Output Frequency: 10 MHz
Output Amplitude: 0 dBm
Frequency Resolution: 0.1 Hz
Keysight E8257 PSG
10 MHz frequency
reference
Output Frequency: 10 MHz
Output Amplitude: 0 dBm
Absolute Freq. Error: < +-0.01 ppm
Symmetricom 58503B
RF cable 50 ohm characteristic impedance (no
substitute)
BNC (m) connectors
Max Frequency: >= 50 MHz
Keysight 8120-1840
Adapters, assorted 3.5 mm (f) to Precision BNC (m)
3.5 mm (f) to 3.5 mm (f)
Keysight 54855-67604
Keysight 83059B
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