Operating instructions

ACCEPTANCE TESTING
5-27
(7) Reduce the RF signal generator RF level until the trace sits on the graticule line 2 divisions
down from the top line. Check that the level set on the RF signal generator is 20 dB down
from reading 1 ±3 dB (functional test only).
(8) Reduce the RF signal generator RF level until the trace sits on the graticule line 3 divisions
down from the top line. Check that the level set on the RF signal generator is 30 dB down
from reading 1 ±3 dB (functional test only).
(9) Reduce the RF signal generator RF level until the trace sits on the graticule line 4 divisions
down from the top line. Check that the level set on the RF signal generator is 40 dB down
from reading 1 ±3 dB (functional test only).
(10) Reduce the RF signal generator RF level until the trace sits on the graticule line 5 divisions
down from the top line. Check that the level set on the RF signal generator is 50 dB down
from reading 1 ±3 dB (functional test only).
(11) On the UUT press [Return], [Return],[Centre Freq], 500 MHz, [Span], 999 MHz,
[Res BW], [Manual Res BW], [3 MHz], [Vert Scale] toggle [10/2 dB/DIV] until 10 dB per
division is displayed.
(12) Set the RF signal generator to 100 MHz and −6.0 dBm. Check and set this level on the
power meter and then connect to the UUT.
(13) Make a note of how many divisions down from the top of screen that the peak of the signal
appears.
(14) Repeat steps 12 and 13 for RF signal generator frequencies of 200 MHz, 400 MHz,
600 MHz and 800 MHz.
(15) Check that the difference between the highest and the lowest point noted is 2 divisions or
less.
(16) To functionally test the look/listen facility first set the following on the UUT. Select the
[Return] , soft key at the bottom right hand corner of the display and then [Return],
[Centre Freq], 300 MHz, [Return], [Vert Scale], toggle [10/2 DB /DIV] until 10 dB per
division is displayed, [Span], 100 kHz, [Res BW], [Auto Res BW].
(17) Set the RF signal generator to provide a signal of 300 MHz at a level of −10 dBm. A signal
should now appear at the centre of the UUT display and be on or close to 1 division down
from the top of the display.
(18) On the UUT select look and listen mode by pressing the [Return] soft key at the bottom left
hand corner of the display and then the [Look n Listen] soft key.
(19) Check that the signal is still at the centre of the display and on or close to 1 division down
from the top of the display.
(20) Set the RF signal generator to provide 10 kHz deviation at 1 kHz modulation rate on the
300 MHz signal.
(21) Check that the UUT display now shows an FM modulated signal. Turn the front panel
volume control up and check that a 1 kHz tone can be heard. This verifies the operation of
the look/listen mode of the Spectrum analyzer. The tracking generator is in reality the
instrument signal generator and is therefore tested when the signal generator is checked.