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RIGOL Chapter 2 Performance Verification Test

MSO4000/DS4000 Performance Verification Guide

2-4

DC Gain Accuracy Test

Specification

DC Gain Accuracy

Specification

±2% × Full Scale

[1]

Note

[1]

: Full Scale = 8 × Current Vertical Scale.

Test Connection Diagram

Figure 2-2 DC Gain Accuracy Test Connection Diagram

Test Procedures

1. DC gain accuracy test when the input impedance is 50 Ω

1) Connect the active signal terminal of Fluke 9500B to CH1 of the oscilloscope, as shown in the

figure above.

2) Turn on Fluke 9500B and set its impedance to 50 Ω.

3) Output a DC signal with +3 mV

voltage (Vout1) via Fluke 9500B.

4) Configure the oscilloscope:

a) Press CH1 in the vertical control area (VERTICAL) at the front panel to turn on CH1.

b) Press CH1  Probe  Ratio to set the probe attenuation ratio to “1X”.

c) Press CH1  Input to set the input impedance of CH1 to 50 Ω.

d) Rotate VERTICAL SCALE to set the vertical scale to 1 mV/div.

e) Rotate HORIZONTAL SCALE to set the horizontal time base to 2 ms.

f) Press VERTICAL POSITION to set the vertical position to 0.

g) Press Acquire  Acquisition and use to select “Average” acquisition mode; press

Averages and use to set the number of averages to 32.

5) Press MENU  Vavg at the left side of the screen of the oscilloscope to turn on the average

measurement function. Read and record Vavg1.

6) Adjust Fluke 9500B to make it output a DC signal with -3 mV

voltage (Vout2).

7) Press MENU  Vavg at the left side of the screen of the oscilloscope to turn on the average

measurement function. Read and record Vavg2.

8) Calculate the relative error of this vertical scale: |(Vavg1 - Vavg2) - (Vout1 -

Vout2)|/Full Scale × 100%.

9) Keep the other settings of the oscilloscope unchanged:

a) Set the vertical scale to 2 mV/div, 5 mV/div, 10 mV/div, 20 mV/div, 50 mV/div, 100

mV/div, 200 mV/div, 500 mV/div and 1 V/div respectively.

b) Adjust the output voltage of Fluke 9500B to 3 × the current vertical scale and -3 × the

current vertical scale respectively.

c) Repeat steps 3) to 7) and record the test results.

d) Calculate the relative error of each vertical scale: |(Vavg1 - Vavg2) - (Vout1 -

Vout2)|/Full Scale × 100%.

10) Turn off CH1. Test the relative error of each scale of CH2, CH3 and CH4 respectively using the

Fluke 9500B

MSO/DS4000