Agilent Technologies 8935 Series, Руководство пользователя

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Chapter 8 193
Performance Tests
RF Generator Level Accuracy Performance Test 5
7. On the signal generator set the level to +8 dBm or whatever level is
suitable for the microwave converter’s LO input.
8. For frequencies of 1700 and 2000 MHz perform the following:
a. On the signal generator set the frequency to 1900 MHz CW and
2200 MHz CW respectively.
b. Reset the measuring receiver.
c. On the measuring receiver set the frequency offset mode to enter
and enable the LO frequency (27.3 Special) then key in the signal
generator (LO) frequency (in MHz) which is 1900 or 2200 MHz
respectively.
d. On the measuring receiver set the measurement mode to tuned
RF level and the measurement units to dBm then press SET REF.
e. Measure and record the RF level at the levels down to and
including -80 dBm shown in the PTR at the Test Set's DUPLEX
OUT port. If the measuring receiver displays the need to
recalibrate, press the CALIBRATE key and wait for calibration to
be completed.
f. After recording the reading at -80 dBm insert an RF amplifier
into the output of the Test Set.
g. Record the new measured level at -80 dBm.
h. Continue measuring the level down to -125 dBm.
i. Move the input to the microwave converter to the RF IN/OUT
port without the amplifier inserted.
j. Measure and record the RF level at the levels down to and
including -80 dBm shown in the PTR at the Test Set's RF IN/OUT
port.
k. After recording the reading at -80 dBm insert an RF amplifier
into the output of the Test Set.
l. Record the new measured level at -80 dBm.
m. Continue measuring the level down to -125 dBm.
n. Correct the measured reading for each level measured without
the amplifier as follows: Add the RF power measured in step 3c or
5b to the measured level. (For example, if the level in step 3c is
-10.2 dBm and the level at -55 dBm is -45.1 dB, record a level of
-10.2 + (-45.1) = 55.3 dBm.) Compare the corrected values with
the limits in the PTR.
o. Correct the measured reading for each level measured with the
amplifier by summing the following values:
+ RF power measured at -10 dBm in step 3c or 5b