Dc Gain Accuracy Test - Rigol DS1102E Service Manual

Chapter 3 Performance Test

DC Gain Accuracy Test

Specifications:
DC Gain
Accuracy
Explanation:
Full Scale = 8 div×vertical scale. Relative error of each scale: |(Vavg1–Vavg2)–(V
Scale×100%≤X% (the value of X is 3 when the vertical scale is 10 mV/div to 10 V/div and the
value of X is 4 when the vertical scale is 2 mV/div to 5 mV/div); otherwise, the test fails. For
example, when the vertical scale is 1 V/div, input DC signals with +3 V
respectively, the values of Vavg1 and Vavg2 are +3.06 V and -3.04 V respectively, the relative
error is |(+3.06 V-(-3.04 V))-(+3 V-(-3 V)) |/(1 V/div*8 div) × 100% = 1.25% and the test
passes.
Test Device: Fluke 9500B
Test Procedures:
1) Connect the active head of Fluke 9500B to CH1 of the oscilloscope.
2) Enable Fluke 9500B and set the output impedance to 1 MΩ.
3) Output a DC signal with +6 mV
4) Configure the oscilloscope:
Press CH1 in the vertical control area (VERTICAL) at the front panel to
a)
enable CH1.
Rotate VERTICAL
b)
Rotate HORIZONTAL
c)
μs.
Rotate VERTICAL
d)
Press Acquire Acquisition and use
e)
press Averages and use
5) Enable the average measurement function of the oscilloscope. Read and
record Vavg1.
6) Adjust Fluke 9500B to output a DC signal with -6 mV
7) Read and record the average value Vavg2 at the moment.
8) Calculate the relative error of the vertical scale:
|(Vavg1–Vavg2)–(V
9) Keep other settings of the oscilloscope unchanged:
a) Set the vertical scale to 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 and 10 V/div
respectively.
b) Adjust the output voltage of Fluke 9500B to ±3 div respectively.
c) Repeats steps 2), 3), 4), 5), 6) and 7) and record the results.
d) Calculate the relative error of each scale.
10) Turn CH1 off. Repeat the above test steps to test CH2 and record the test
results.
Service Guide for DS1000E, DS1000D Series
≤4%×Full Scale (2 mV/div to 5 mV/div)
≤3%×Full Scale (10 mV/div to 10 V/div)
SCALE to set the vertical scale to 2 mV/div.
POSITION to set the vertical position to 0.
-V )|/Full Scale×100%.
out1 out2
voltage (V ) from Fluke 9500B.
D out1
C
SCALE to set the horizontal time base to 10
to set the number of averages to 32.
-V
out1 out2
and -3 V voltages
DC DC
to select "Average". Then,
voltage(V
D out2
C
RIGOL
)|/Full
).
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