Anritsu Company Site Master S312D, Maintenance Manual, Page: 34 / 62

2-11 Spectrum Analyzer Displayed Average Noise Level (DANL) Performance Verification
2-24 PN: 10580-00195 Revision B S312D MM
2-11 Spectrum Analyzer Displayed Average Noise Level (DANL)
The following test can be used to verify the Displayed Average Noise Level of the S312D. This test is performed
using the RMS detection mode, with preamp on.
Required Equipment (refer to
Table 1-1
):
• 50 ohm termination, Anritsu Model 28N50-2
• Site Master S312D
Procedure:
1. Connect the 28N50-2 50 Ohm termination to the S312D Spectrum Analyzer RF In. (Refer to Figure 2-10 .)
2. Set the S312D to Spectrum Analyzer mode.
3. Press the
AMPLITUDE
key and press
Atten/Preamp
, then
Preamp Control Manual
. Press
Preamp On/Off
so
that
AMP*
appears on the bottom-left of the display.
4. Press the
AMPLITUDE
key and press
Atten/Preamp
, then press
Manual
, and enter
0
for Atten.
5. Press the
AMPLITUDE
key and press
Ref Level
, and set the Reference Level to
–75 dBm
.
6. Press the
MEAS/DISP
key and press
Trace
, then
Detection
, then press
RMS Average
.
7. Press the
MEAS/DISP
key and press
Bandwidth
, then
RBW Manual
. Set RBW to
10 kHz
.
8. Press the
FREQ/DIST
key and set
Start Frequency
to
100 kHz
and set
Stop Frequency
to
10 MHz
.
9. After the sweep has finished, press the
MARKER
key and set
M1
to
Marker to Peak
.
10. Convert the marker reading from 10 kHz RBW to 100 Hz RBW value by subtracting 20 dB. (For example,
if the marker shows a value of –100 dBm at 10 kHz RBW, then the computed value for 100 Hz RBW
is –120 dBm.) Enter the computed value in
Table A-14, “Spectrum Analyzer Displayed Average Noise
Level (DANL)” on page A-8 .
11. Set
Stop Frequency
to
1.6 GHz
and set
Start Frequency
to
10 MHz
.
12. After the sweep has finished, press the
MARKER
key and set
M1
to
Marker to Peak
.
13. Convert the marker reading from 10 kHz RBW to 100 Hz RBW value by subtracting 20 dB. (For example,
if the marker shows a value of –120 dBm at 10 kHz RBW, then the computed value at 100 Hz RBW
is –140 dBm.) Enter the computed value in
Table A-14 .