Spectrum Analyzer Residual Spurious Response Test - Anritsu Spectrum Master MS2721A Maintenance Manual

2.5. Spectrum Analyzer Residual Spurious Response Test

The following test can be used to verify the residual spurious response of the Spectrum Master. This test is performed
using the positive peak detection mode. There are two parts to this test:
· Residual Spurious Test with Preamp off
· Residual Spurious Test with Preamp on
Residual Spurious Test with Preamp Off
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 –40 and press the
7. Press the
Atten Lvl
8. Make sure that the
to turn it off.
9. Press the
Shift
10. Press the
Freq
11. Use the keypad to enter 100 and select the
12. Press
Stop Freq
13. Press the
BW
14. Use the keypad to enter 3 and select the
15. Press the
VBW
16. Wait until one sweep is completed.
17. Press the
Marker
18. Record the Marker 1 amplitude reading and verify that it is £ –90 dBm.
NOTE: If a spur with amplitude larger than –90 dBm occurs, wait another full sweep and observe
whether the spur occurs at the same point on the second sweep. If the spur does not occur at the
same point on the second sweep, then the spur on the first sweep was not real.
8
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 off position. If the preamp is on, press the
Pre Amp On/Off
key and then press the
Sweep
key and select the
Start Freq
soft key, enter 10 and press the
key and select the soft key.
RBW
kHz
soft key and use the keypad to enter 300, then select the
key and select the
Peak Search
.
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
Detection
soft key.
soft key.
kHz
soft key.
MHz
soft key.
soft key.
Pre Amp On/Off
and then the soft keys.
Peak
soft key.
Hz
Spectrum Master MM
soft key