Specifications

Chapter 2 Performance Verification Test RIGOL
DS2000 Performance Verification Guide
2-3
DC Gain Accuracy Test
Specification:
DC Gain Accuracy ≤2%×Full Scale
Explanation:
Full Scale = 8 div×vertical scale. Relative error of each scale: |(Vavg1–Vavg2)–(V
out1
-V
out2
)|/Full Scale×100%≤2%;
otherwise, the test fails. For example, when the vertical scale is 1 V/div, input DC signals with +3 V
DC
and -3 V
DC
voltages 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, as shown in figure
below.
2) Enable the Fluke 9500B and set the output impedance to 1 MΩ.
3) Output a DC signal with +1.5 mV
DC
voltage (V
out1
) from Fluke 9500B.
4) Configure the oscilloscope:
a) Press CH1 in the vertical control area (VERTICAL) at the front panel to enable CH1.
b) Rotate VERTICAL SCALE
to set the vertical scale to 500 μV/div.
c) Rotate HORIZONTAL SCALE to set the horizontal time base to 10 μs.
d) Rotate VERTICAL POSITION
to set the vertical position to 0.
e) Press Acquire Acquisition and use to select “Average”. Then, press Averages
and use to set the number of averages to 32.
5) Press MENU  Vavg at the left of the screen to enable the average measurement function
of the oscilloscope. Read and record Vavg1.
6) Adjust Fluke 9500B to output a DC signal with -1.5 mV
DC
output voltage (V
out2
).
7) Press MENU  Vavg at the left of the screen to enable the average measurement function
of the oscilloscope. Read and record Vavg2.
8) Calculate the relative error of the vertical scale:
|(Vavg1–Vavg2)–(V
out1
-V
out2
)|/Full Scale×100%.
9) Keep other settings of the oscilloscope unchanged:
a) Set the vertical scale to 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 and 10 V/div respectively.
b) Adjust the output voltage of Fluke 9500B to ±3 div respectively.
c) Repeat steps 1), 2), 3), 4), 5) and 6) and record the test results.