Display Average Noise Level (Danl) - Anritsu Spectrum Master MS2721A Maintenance Manual
Spectrum analyzer
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Also See for Spectrum Master MS2721A:
- Specifications (4 pages) ,
- Firmware update (4 pages) ,
- Programming manual (59 pages)
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2.6. Display Average Noise Level (DANL)
The following test can be used to verify the display average noise level of the Spectrum Master. This test is performed
using the RMS detection mode.
a.
Equipment Required:
· Anritsu 28N50-2, 50 Ohm Termination or equivalent
· Anritsu Spectrum Master External Power Supply (Anritsu part number 40-168)
b.
Procedure:
1.
Connect the 50 Ohm termination to the Spectrum Master
2.
Connect the external power supply (Anritsu part number 40-168) to the Spectrum Master.
3.
Press the
ON/OFF
4.
Press the
Shift
conditions.
NOTE: Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
5. Press the
Amplitude
6.
Use the keypad to enter –50 and press the
7.
Press the
Atten Lvl
8.
Make sure that the
key to turn it on.
9.
Press the
Shift
10. Press the
BW
11. Use the keypad to enter
12. Press the
Freq
13. Use the keypad to enter 10 and select the
14. Press the
Stop Freq
15. Wait until one sweep is completed.
16. Press the
Marker
17. Record the Marker reading in the Measured Value column of Table 4.
NOTE: The noise floor consists of totally random signals where a spur is a fixed spike of varying ampli-
tude that is always visible. If Peak Search lands the marker on a spur, the rotary knob can be used to
move the marker to the next peak.
18. Subtract 40 dB from the Measured Value to normalize it for a 10 Hz RBW and record the new value in the Nor-
malized Value column of Table 4. Verify that the normalized value is less than the Specification value.
NOTE: DANL @ 10 Hz RBW = Measured DANL @ 100 kHz – 10log
19. Repeat steps 12 through 18 for the other frequency settings in Table 4.
Spectrum Master MM
key to turn on the Spectrum Master.
key, the
(1) key, and then the
Preset
key and select the
Reference Level
soft key and enter 0, then press the
key is in the On position. If the preamp is off, press the
Pre Amp On/Off
key and then press the
Sweep
key and select the
soft key.
RBW
and select the
100
key and select the
Start Freq
soft key, enter 1 and press the
key and the
Peak Search
= Measured DANL @ 100 kHz – 40 dB
.
RF In
soft key to reset the instrument to the default starting
Preset
soft key.
soft key.
dBm
soft key.
dB
(3) key, then select the
soft key.
kHz
soft key.
soft key.
MHz
soft key.
GHz
soft key.
æ
ç
è
Pre Amp On/Off
and then the
Detection
RMS
ö
100
kHz
÷
10
Hz
ø
soft
soft key.
11
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