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a. To enable CH1, perform any of the following operations:
b. Set the probe attenuation ratio to "1X".
c. Set the input impedance of CH1 to 50 Ω.
d. Set the vertical scale to 1 mV/div.
e. Set the horizontal time base to 1 μs/div.
f. Set the vertical offset to 0.
g. In the Horizontal menu, select "Average" for the Acquisition item. Then click or
tap the input field of Averages to set the number of averages to 32 with the
pop-up numeric keypad.
h. Adjust the trigger level to prevent the signals from being triggered by mistake.
5. Test the relative error of each scale of CH1 (except 2 V/div, 5 V/div, and 10 V/div)
according to Step 5-9 specified in
impedance is 1 MΩ
6. Turn off CH1. Test the relative error of each scale of CH2, CH3, and CH4
respectively using the method above and record the test results.
5.4.4
Test Record From
1 MΩ Input Impedance
Channel
CH1
CH2
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and record the test results.
Vertical
Scale
Vavg1
1 mV/div
2 mV/div
5 mV/div
10 mV/div
20 mV/div
50 mV/div
100 mV/div
200 mV/div
500 mV/div
1 V/div
2 V/div
5 V/div
10 V/div
1 mV/div
2 mV/div
5 mV/div
Performance Verification Test
DC gain accuracy test when the input
Test Result
Calculatio
Vavg2
[1]
n Result
DHO4000 Performance Verification
Limit
Pass/Fail
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
≤2%
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