24 S-Series Oscilloscopes Service Guide
3 Testing Performance
Offset Accuracy Test
t
Specifications
Procedure
1 Disconnect all cables from the oscilloscope channel inputs.
2 Click Control > Factory Default. The input impedance for channel 1 should be
50
Ω.
Ensure that the input voltage to the oscilloscope never exceeds ±5 V.
The oscilloscope must be warmed up (with the oscilloscope application running) for at least
30 minutes at ambient temperature prior to the start of any performance test.
Offset Accuracy ± 0.1div ± 2 mV ±1.0% of offset setting for offsets < 2V
± 0.1div ± 2 mV ±1.5% of offset setting for offsets ≥ 2V
50 Ω Input Impedance: Full scale is defined as 8 vertical divisions. Magnification is used below
2 mV/div. Below 2 mV full scale is defined as 16 mV. The major scale settings are 5 mV, 10 mV,
20 mV, 50 mV, 100 mV, 200 mV, 500 mV and 1 V.
1 MΩ Input Impedance: Full scale is defined as 8 vertical divisions. The major scale settings are
5 mV, 10 mV, 20 mV, 50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, and 5 V.
Equipment Required
Description Critical specifications Recommended model
or part number
Digital Multimeter DC voltage measurement accuracy better than ±0.1%
of reading
34411A or 3458A
Cable Assembly
(2 required)
50 Ω characteristic impedance, BNC (m) connectors 8120-1840
DC Power Supply 40 V 6614C
Adapter BNC Tee (m)(f)(f) 1250-0781
Adapters (2) BNC (f) to dual banana 1251-2277
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