5.7 DC Accuracy
Specification
≤ ±2 % of full scale + 2mv, with 0 mV offset.
Note: This limit applies to a single point measurement (absolute DC accuracy, as
measured by this procedure), for measurements of gain accuracy (difference of two
points) the specification is: ≤ ±1.0 % of full scale
Description
This test measures the DC Accuracy within the gain range specified.
It requires a DC source with a voltage range of 0 V to 6 V adjustable in steps of no
more than 15 mV, and a calibrated DMM that can measure voltage to 0.1 %.
Measurements are made using voltage values applied by the external voltage
reference source, measured by the DMM, and in the oscilloscope using the
parameters Mean. For each known input voltage, the deviation is checked against
the tolerance.
5.7.1 Positive 50Ω DC Accuracy
Procedure
Recall DC accuracy - 50 ohm 2mv.lss or configure the DSO :
Panel Setups : Recall FROM DEFAULT SETUP
Channels Trace ON Channel 1, Channel 2, Channel 3 & Channel 4
Input Coupling : DC 50Ω on all 4 Channels
Input offset : 0.0 mV on all 4 Channels
Input gain : from 2mV/div to 1 V/div. (see Table 5) on all 4 Ch
C1 Averaging : 5 sweeps
C2 Averaging : 5 sweeps
C3 Averaging : 5 sweeps
C4 Averaging : 5 sweeps
Trigger setup : Edge
Trigger on : Line
Mode : Auto
Time base : 1 µsec/div.
Channel use : 4
Change parameters
P1 : Measure mean of C1
P2 : Measure mean of C2
P3 : Measure mean of C3
P4 : Measure mean of C4
WR6K Rev.D Performance Verification 5-17
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