Operating instructions

ACCEPTANCE TESTING
5-26 46882-311D
C2594
N TYPE
OUTPUT
EXTERNAL
STANDARD
OUTPUT
UUT
Signal generator
Fig. 5-18 RF spectrum analyzer checks
(1) Refer to Results table 5-44 on page 5-44. Set the UUT to [SPEC ANA],
[Centre Freq] 101 MHz, [Span] 1 kHz, BNC antenna input socket, [Ref Level] -30.0 dBm.
(2) With nothing connected to the UUT, check that the noise floor is on or below the bottom
graticule line of the display. (80 dBm dynamic range.)
(3) Connect the equipment as shown in Fig. 5-18, connecting the incoming signal to the N-type
input socket of the UUT. Set the UUT to N-type input.
(4) On the UUT, select [Res BW] [Manual Res BW], [30 kHz], [Ref Level] to 0 dBm.
(5) Set the RF signal generator to provide a signal at 101 MHz at a level of 0 dBm. Adjust the
RF signal generator level until the trace sits at the top of the screen. Check that the level set
on the RF signal generator is 0 dBm
±
4 dB (Functional test only). Note this reading (reading
1).
(6) Reduce the RF signal generator RF level until the trace sits on the graticule line 1 division
down from the top line. Check that the level set on the RF signal generator is 10 dB down
from reading 1
±
3 dB (functional test only).
(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], 100 MHz, [Span], 52 MHz, [Res BW],
[Manual Res BW], [3 MHz], [Vert Scale] toggle [10/2 dB/DIV] until 2 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 75 MHz, 88 MHz, 112 MHz
and 125 MHz.