Performance Ver
ification
Check Displayed Average Noise Level (DANL)
This test does not require an input signal.
The test measures the average internal noise level of the instrument, ignoring residual spurs.
It checks these ranges:
9 kHz to 50 kHz (all models)
50 kHz to 5 MHz (all models)
5 MHz to BW (MDO3SA not installed)
5 MHz to 2 GHz (MDO3SA installed)
2 GHz to 3 GHz (MDO3SA installed)
NOTE. If the specific measurement frequency results in measuring a residual spur that is visible above the noise level, the
DANL specification applies not to the spur but to the noise level on either side of the spur. Please refer to the Spurious
Response specifications.
1. Initial oscil losc ope setup:
a. Terminate the RF input in 50 with no input signal applied.
b. Push the Default Setup button on the front panel.
c. Push the front-panel RF button to turn on the RF channel and display the bottom-bezel RF menu.
d. Turn on the average trace as follows: Push the bottom-bezel Spectrum Traces button and set Normal to Off. Push
the side-bezel Average button to set the Average Traces to On.
e. Turn on the average detection as follows: Push the bottom-bezel Detection Method button. P ush the side-bezel
button to set the detection method to Manual. Push the side-bezel Average Trace button. Set the detection
method to Average.
f. Set the reference level to –15 dBm as follows: Push the front-panel Ampl button. Push the side-bezel Ref Level
button. Set the Ref Level to –15.0 dBm.
g. Set the start and stop frequency as follows: Push the front-panel Freq/Span button. Push the side-bezel Start
button. Set the start frequency to 9 kHz. Push the side-bezel Stop button. Set the stop frequency to 50 kHz.
2. Check from 9 kHz to 50 kHz (all models):
a. Set Manual Marker (a) at the frequency with the highest noise level as follows: Push the Markers front-panel button.
Push the Manual Markers side bezel button to turn on the markers. Turn Multipurpose knob a to move the m arker to
the frequency at the noise threshold (highest point of noise), ignoring any spurs. For this span, it should be near
9 kHz on the far left of the screen. See the following figure.
92 MDO3000 Series Specifications and Performance Verification
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