8. Record the negative-measured and positive-measured mean readings in the
worksheet as follows:
a. Set the DC Voltage Source to V
negative
.
b. Push the front-panel Wave Inspector Measure button.
c. In the Measurements Setup window, go to the Measurements box. Click
the More button and then select Mean.
d. View the Mean measurement value in the display.
e. In the Measurement Setup window, select Statistics.
f. Click Reset.
g. Enter the mean reading in the worksheet as V
negative-measured
. (See
Table 22: Gain expected worksheet on page 322.)
h. Set the DC Voltage Source to V
positive
.
i. Click Reset again.
j. Enter the mean reading in the worksheet as V
positive-measured
.
Table 22: Gain expected worksheet
Oscilloscope
Vertical Scale
Setting
V
diffExpected
V
negative
V
positive
V
negative-measured
V
positive-measured
V
diff
Test Result
(Gain
Accuracy)
2 mV/div 18 mV -9 mV +9 mV
5 mV 45 mV -22.5 mV +22.5 mV
10 mV 90 mV -45 mV +45 mV
20 mV 180 mV -90 mV +90 mV
50 mV 450 mV -225 mV +225 mV
100 mV 900 mV -450 mV +450 mV
200 mV 1800 mV -900 mV +900 mV
500 mV 4900 mV -2450 mV +2450 mV
1.0 V 9000 mV -4500 mV +4500 mV
20 mV at
250 MHz
180 mV -90 mV +90 mV
20 mV at Full
bandwidth
180 mV -90 mV +90 mV
9. Record Gain Accuracy as follows:
a. Calculate Vdiffas follows:
Vdiff= | Vnegative-measured- Vpositive-measured |
b. Enter Vdiffin the worksheet. (See Table 22: Gain expected worksheet on
page 322.)
c. Calculate Gain Accuracy as follows:
Performance verification (MSO/DPO5000/B series)
322 MSO70000C/DX, DPO70000C/DX, DPO7000C, MSO5000/B, DPO5000/B Series