Operating instructions

OPERATING MANUAL 2945A
46882-311D 5-27
(15) Check that the difference between the highest and the lowest point noted is less than 1.1
divisions.
(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 [10/2DB /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.
RF broad band power meter
Specification
Frequency range: 200 kHz to 1.05 GHz.
Accuracy: ± 10% ± resolution.
Resolution: 0.1 dB
Test equipment
Description Minimum specification Example
Calibrated RF
power source
consisting of:-
Accuracy better than 2.1%.. See below.
RF signal
generator
11 MHz to 1 GHz frequency range, RF level
13 dBm
IFR 2041
Power splitter 6 dB 50 Ω 11 MHz to 1 GHz. Weinschel 1870A
RF Amplifier 3W 40 dB gain 11 MHz to 1000 MHz IFR 2177 or
AR5W1000 MHz
Attenuator pads Values dependent upon amplifier used.
RF power meter ±0.1 dB from 11 MHz to 1 GHz IFR 6960/A/B +
6912 sensor
(1) Refer to Results table 5-45 on page 5-45. Set the UUT to [Tx TEST], [SELECT] N-type
input socket (i.e. only the  LED on). From power up, the instrument should already be set
to Autotune mode with wide band power meter (WB) selected.
(2) Connect the equipment as shown in Fig 5-19, connecting to the N-type input socket on the
UUT.
(3) Set the calibrated power source to provide a signal at 11 MHz and 100 mW(+20 dBm) to the
UUT input. Note the level on the UUT broad band power meter and check that it is within
the stated specification. Repeat at 100 MHz and then in 100 MHz steps up to and including
1000 MHz.