Chapter 5
161
Functional Testing
Displayed Average Noise Level (DANL)
4. Connect 50
Ω
termination to RF input of the UUT.
NOTE
Ensure that you perform the measurement on the noise floor and not on
a residual response within the displayed 10 kHz span. If a residual
response appears, disregard the residual response when making the
measurement.
5. Measure the average amplitude of the displayed noise level by
performing the following steps:
a. Determine the average amplitude of the displayed noise floor by
visual inspection.
b. Set the marker to a point on the trace that is representative of the
average value of the display noise floor by pressing
Marker
,
Trace
,
and
Spectrum Avg
. Then adjust the RPG knob until the marker is
set on the average value point.
c. Read the marker value and then enter the average amplitude
value into the Measured DANL column of Table 5-14, “DANL
Data Sheet.”
Table 5-13
UUT Initialization
Parameter
Setting
Mode
Basic
Measure
Spectrum
Frequency
Center
19.995 MHz
Span
10 kHz
Resolution Bandwidth
1 kHz
ADC Range
Auto/On/Off
Auto
Input Attenuation
0 dB
Average
On/Off
On
Mode
Exp
Type
Log-Pwr Avg
Number
100
Y Scale
Ref Value
−
85 dBm
dB/Div
5 dB
Trace Display
Average
Содержание E4406A
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