User manual

Chapter 2 Performance Verification Test RIGOL
MSO4000/DS4000 Performance Verification Guide
2-11
Bandwidth Limit Test
The bandwidth limit test verifies the 20 MHz bandwidth limit function, 100 MHz bandwidth limit
function and 200 MHz bandwidth limit function of the oscilloscope respectively by testing the
amplitude losses of the oscilloscope under test at the bandwidth limits.
For different models of oscilloscopes, the bandwidth limits are different, as shown in the table below.
Table 2-3 Bandwidth Limits of the Oscilloscope under Test
Model
Bandwidth Limit
MSO405X/MSO403X/DS405X/DS403X
20 MHz/100 MHz/200 MHz
MSO402X/DS402X
20 MHz/100 MHz
MSO401X/DS401X
20 MHz
Specification
Bandwidth Limit
Amplitude Loss
[1]
-3 dB to 1 dB
Note
[1]
: Amplitude Loss (dB) = 20 × lg (Vrmsn/Vrms1). Wherein, Vrmsn represents Vrms2 or Vrms3; Vrms1 is the
measurement result of amplitude effective value at 1MHz; Vrms2 is the measurement result of amplitude effective
value at the bandwidth limit; Vrms3 is the measurement result of amplitude effective value when the frequency is
greater than the bandwidth limit.
Test Connection Diagram
Figure 2-4 Bandwidth Limit Test Connection Diagram
Test Procedures
1. 20 MHz bandwidth limit test
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) 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 100 mV/div.
e) Rotate HORIZONTAL SCALE to set the horizontal time base to 500 ns.
f) Press HORIZONTAL POSITION and VERTICAL POSITION respectively to
set the horizontal position and vertical position to 0.
g) Press TRIGGER LEVEL to set the trigger level to 0 V.
4) Press CH1  BW Limit and use to set the bandwidth limit to “20 M”.
5) Output a Sine with 1 MHz frequency and 600 mVpp amplitude via Fluke 9500B.
Fluke 9500B
MSO/DS4000