Chapter 4: Testing Performance
Offset Accuracy Test
41
Offset Accuracy Test
CAUTION Ensure that the input voltage to the oscilloscope never exceeds ±5 V.
Specifications
Equipment Required
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. The
offset accuracy test procedure tests each of these terms individually.
Procedure
Zero Error Test 1
Disconnect all cables from the scope channel inputs.
2 Press Default Setup, then configure the scope as follows:
a Pull down the Setup menu and select Acquisition.
Let the oscilloscope warm up before testing
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 offset + 1% of full scale + 1 mV)
Full scale is defined as 8 vertical divisions. Magnification is used below 5 mV/div. Below 5 mV
full scale is defined as 40 mV. The major scale settings are 5 mV, 10 mV, 20 mV,
50 mV, 100 mV, 200 mV, 500 mV and 1 V.
Description Critical Specifications Recommended
Model/
Part Numbers
Digital Multimeter DC voltage measurement accuracy better than ±0.1% of reading Agilent 34401A or
Agilent 3458A
Cable Assembly
(2 required)
50Ω characteristic impedance, BNC (m) connectors Agilent 8120-1840
Adapter BNC Tee (m)(f)(f) Agilent 1250-0781
Adapter BNC (f) to dual banana Agilent 1251-2277
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