28 S-Series Oscilloscopes Service Guide
3 Testing Performance
11 Repeat steps 9b and 10 for the remaining vertical scale settings for channel 2.
12 Repeat steps 8 through 11 for channels 3 and 4.
13 Ensure that each V
zero-error
is less than the corresponding V
zero-error
Limit entry
in the Offset Accuracy Test table.
14 Make the connections to oscilloscope channel 1 as shown below.
15 Set up the DMM to perform DC voltage measurements.
16 Click Control > Factory Default to default to channel 1.
Channel Input on S-Series Oscilloscope
BNC (f) to dual banana
(1251-2277)
6614C DC Supply
• Where the BNC Tee adapter is used, it is important to connect it directly to the oscilloscope channel
input to minimize ground potential differences and to ensure that the DMM measures the input
voltage to the oscilloscope channel as accurately as possible. Differences in ground potential can be
a significant source of measurement error, particularly at high scope sensitivities.
• It also helps to reduce ground potential differences if the oscilloscope and DMM are connected to
the same AC supply circuit.
• 256 averages are used in the oscilloscope measurements of this section to reduce measurement
noise and to reduce the measurement error due to resolution.
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