32 S-Series Oscilloscopes Service Guide
3 Testing Performance
Procedure
1 Make the connections to oscilloscope channel 1 as shown below.
2 Click Control > Factory Default, then configure the oscilloscope as follows:
a Click Setup > Acquisition....
b In the Acquisition dialog box, enable averaging and set # of Averages to 256.
3 Set the DC Supply voltage (External Supply Setting) to +15 mV.
4 Use the Channel dialog box to set the channel 1 vertical scale to 5 mV/div, and
make sure the input impedance is set to 50 Ω.
5 Drag and drop the Average voltage measurement icon onto the channel 1
waveform.
6 Press [Clear Display] on the oscilloscope, wait for the number of averages to
return to 256, and then record the DMM voltage reading as V
DMM+
and the
scope mean V avg reading as V
Scope+
in the DC Gain Accuracy Test (50 Ω)
section of the Performance Test Record.
• 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.
Channel Input on S-Series Oscilloscope
BNC (f) to dual banana
(1251-2277)
6614C DC Supply
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