78 Keysight Infiniium MXR-Series Real-Time Oscilloscopes User's Guide
6 Testing Performance
the scope V avg reading (Vscope- column) in Table 9 of the Performance Test
Record.
9 Repeat step 8 for the remaining vertical scale settings for channel 1 shown in
Table 9 of the Performance Test Record.
10 Click Control > Factory Default, turn off channel 1 and turn the channel 2 display
on.
11 Set the DC Supply voltage (External Supply Setting) to +15 mV.
12 Configure the oscilloscope to measure the average voltage on channel 2:
a Click Setup > Acquisition.... In the Acquisition dialog box, enable averaging
and set # of Averages to 256.
b Change the vertical scale of channel 2 to 5 mV/div.
c Drag and drop the Average voltage measurement icon onto the channel 2
waveform.
13 Press [Clear Display] on the oscilloscope, wait for the number of averages to
return to 256, and then record the DMM voltage reading (VDMM+) and the
scope V avg reading (VScope+) in Table 9 of the Performance Test Record.
14 Repeat step 13 for the remaining vertical scale settings for channel 2 in Table 9
of the Performance Test Record.
15 Repeat step 10 through step 14 for the remaining channels.
16 Repeat step 2 through step 15 using 1 MΩ for the scope input impedance
rather than 50 Ω. The steps should be followed exactly except in step 4, you
should select the 1 MΩ button from the Impedance section of the Channel
dialog box rather than 50 Ω and all values should be entered in Table 10 rather
than Table 9.
17 Calculate the offset gains for the 50 Ω test and the 1 MΩ test using the
following expression and record these values in Table 9 and Table 10 of the
Performance Test Record.
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