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(1) At the measurement of frequency response, connect the spectrum analyzer’s RF Input to 6769B RF OUTPUT through
a signal feeder. The signal feeder consists of a coaxial cable (e.g. SUCOFLEX) less than 1 m length and two 3 dB
attenuators attached to each end of the cable.
(2) At the calibration of power output, connect the end of the feeder to power sensor.
Note that 1) the coaxial cable and 3 dB attenuators must be with a frequency range over the spectrum analyzer’s range,
2) use a torque wrench for tightening each connection, 3) do not disconnect the connections of the 6769B and the
signal feeder after the power calibration in order to keep the measured data valid.
Procedure :
Note that the spectrum analyzer (DUT) and the measuring instruments must be warmed up at least for an hour, before the
compensation process.
(1) Run the Frequency Response Compensation program, and then confirm that 6769B output is set to 10 MHz (CW).
(2) After 5 minutes waiting or more, input the serial number of the spectrum analyzer to the personal computer.
(3) Execute “DUT Check” by pushing the button on the PC display.
(4) After internal calibration of the spectrum analyzer, confirm that the spectrum analyzer’s “Cal Status” is all zero.
(5) Carry out zero adjustment and sensor sensitivity adjustment on the power meter, and then connect the MA4601A
power sensor to the end of the cable from MG3633A OUTPUT.
(6) Set MG3633A output to 625 kHz (CW), and adjust the output level so that power meter reading becomes 0 dBm at the
end of the cable, and then connect this end to the spectrum analyzer RF Input.
(7) After “Preset All”, set the spectrum analyzer to :
Center frequency, 625 kHz
Span, 50 kHz
RBW, 10 kHz
VBW, 1 kHz
Atten, 10 dB
Reference Level, 0 dBm
(8) On the spectrum analyzer’s display, read the marker level of 625 kHz signal, and input the reading to “625 kHz CAL
OSC Level” space on the PC display. For example: when marker reading is 0.30 dBm, input “0.30” to the space.
2.2 Troubleshooting
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