RIGOL
DS1000B Service Guide
3-8
DC Gain Accuracy Test
Specification:
DC Gain Accuracy
Specification
2 mV/div to 5 mV/div, ±4% × Full Scale
[1]
10 mV/div to 10 V/div
，
±3% × Full Scale
Note
[1]
: Full Scale = 8 × Current Vertical Scale
Test Procedures:
1.
Connect the active signal terminal of Fluke 9500B to CH1 of the oscilloscope, as
shown in Figure 3-8.
2.
Turn on Fluke 9500B and set its impedance to 1 MΩ.
3.
Output a DC signal with +6 mV
D
C
voltage (Vout1) via Fluke 9500B.
4.
Configure the oscilloscope:
1)
Press CH1 in the vertical control area (VERTICAL) at the front panel to turn
on CH1.
2)
Press CH1
Probe to set the probe attenuation ratio to “1X”.
3)
Rotate VERTICAL SCALE to set the vertical scale to 2 mV/div.
4)
Rotate HORIZONTAL SCALE to set the horizontal time base to 100 us.
5)
Press VERTICAL POSITION to set the vertical position to 0.
6)
Press Acquire
Acquisition and use
to select “Average” acquisition
mode; press Averages and use
to set the number of averages to 32.
5.
Press Measure
Voltage
Vavg to turn on the average measurement
function. Read and record Vavg1.
6.
Adjust Fluke 9500B to make it output a DC signal with -6 mV
D
C
voltage (Vout2).
7.
Press Measure
Voltage
Vavg 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:
1)
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.
2)
Adjust the output voltage of Fluke 9500B to 3 × the current vertical scale and
-3 × the current vertical scale respectively.
3)
Repeat steps 3 to 7 and record the test results.
4)
Calculate the relative error of each vertical scale: |(Vavg1 - Vavg2) -
(Vout1 - Vout2)|/Full Scale × 100%.
10.
Turn off CH1. Repeat the steps above to test the relative error of each scale of
CH2, CH3 and CH4 and record the test results.
