Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Performance Check
Fig. 3-5. Test equipment setup for measuring the 0.01—2.0 GHz frequency response.
2.0 GHz and set the FREQ SPAN/DIV to 100 MHz. For
bands 2, 3, and 4, it is less confusing and easier to check
frequency response in 1 GHz increments. The sweep gener
ator start and stop range can be set for 1.6 to 2.4 GHz and
the 492/492P FREQUENCY to 2.0 GHz for the first check.
j. Check the frequency response for the 1.7 to 2.4 GHz
portion of band 2. Amplitude deviation, from a mean aver
age, must not exceed ± 1.5 dB.
k. Replace the 0.01 to 2.4 GHz sweep source with a 2.0
to 18 GHz sweep oscillator. Connect the test equipment as
shown in Fig. 3-7. Switch the RF plug-in ALC to Mtr. Con
nect a coaxial cable between the Recorder Output of the
power meter and the RF plug-in Ext ALC Input. Decrease
\ the Power Level to approximately - 6 dBm and adjust the Fig. 3.6. Typical display showing frequency response from a
,y Gain for stable operation (output stops oscillating). sweeping signal source.
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2 7 2 7-4
REV AUG 1981
3-17
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