Chapter 3: Testing Performance
DC Measurement Accuracy (Single Cursor) Test
3–12
Procedure
1
Make the connections to scope channel 1 as shown in the connection diagram on the
previous page.
2 Set up the DMM to perform DC voltage measurements.
3 Press Default Setup, then configure the scope as follows:
a Pull down the Utilities Menu and select Acquisition.
b When the Acquisition Setup window is displayed, enable averaging and set the # of
averages to 256 as shown below.
Notes
• It is important to connect the BNC Tee adapter directly to the scope channel input to minimize ground
potential differences between the scope and the test instruments and to ensure that the DMM measures
the input voltage to the scope 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 scope and the external test instruments are
connected to the same AC supply circuit.
• A fairly large number of averages are used in the scope measurements of this section to reduce
measurement noise and to reduce the measurement error due to resolution to a negligible value.
• Only single cursor measurements are made in this procedure since this measurement covers all of the
accuracy terms in this product's dc vertical accuracy specification and makes the procedure more
efficient.
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