Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 22 / 136

22 90000 A-Series Service Guide
3
Testing Performance
Offset Accuracy Test
Specifications
Equipment Required
Zero Error Test Procedure
1
Disconnect all cables from the oscilloscope channel inputs.
2
Press [Default Setup] .
3
Click Setup > Acquisition... . In the Acquisition dialog box, enable averaging and
set # of Averages to 256.
CAUTION
Ensure that the input voltage to the oscilloscope never exceeds ±5 V.
NOTE
The oscilloscope under test must be warmed up (with the oscilloscope application running) for
at least 30 minutes prior to the start of any performance test.
Offset Accuracy ≤ 3.5 V: ±(2% of channel 1% of full scale + 1 mV)
>3.5 V: ±(2% of channel 1% of full scale)
Full scale is defined as 8 vertical divisions. Magnification is used below 5 mV/div. Below 5 mV/div, full
scale is defined as 40 mV. The major scale settings are 5 mV/div, 10 mV/div, 20 mV/div, 50 mV/div,
100 mV/div, 200 mV/div, 500 mV/div, and 1 V/div.
Equipment Critical Specifications Recommended Model/Part #
Digital Multimeter DC voltage measurement accuracy
better than ±0.1% of reading
Keysight 34401A or
Keysight 3458A
Cable Assembly
(2 required)
50 Ω characteristic impedance,
BNC (m) connectors
Keysight 8120-1840
Adapter BNC Tee (m)(f)(f) Keysight 1250-0781
Adapter BNC (f) to dual banana Keysight 1251-2277
NOTE
The offset accuracy specification has two terms: ± (offset gain + zero error). The offset gain
specification is ±2% of channel offset, and the zero error specification is ±(1% of full scale +
1mV) for
≤
3.5 V, and 1% of full scale for > 3.5 V. The offset accuracy test procedure tests
each of these terms individually.