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Performance Test
R&S FSP
1166.4556.82 1.24
E-1
Checking Modulation
Checking I/Q Modulation
Test equipment:
-
Arbitrary waveform generator (refer to "Measurement Equipment",
item 16)
- Spectrum Analyzer (refer to "Measurement Equipment", item 15)
- 2 Voltmeters (refer to "Measurement Equipment", item 17)
- 2 BNC T pieces
Test setup with R&S ADS:
Apply the I and Q outputs of ADS to the I and Q inputs of the
analyzer. Check the ADS voltages in parallel via T pieces.
Connect spectrum analyzer to the TG output.
Test setup with 33220A:
Apply the outputs of 33220A to the I and Q inputs of the analyzer.
Check the 33220A-
voltages in parallel via T pieces.
Synchronize the two 33220A via Option 001.
Connect spectrum analyzer to the TG output.
Generator settings:
Set DC voltage (offset) to 0 mV
±
3 mV
AC voltage: V(pp) = 1 V
±
10 mV
Frequency: 200 kHz
Phase (I/Q) = 90 degrees
Spectrum analyzer settings:
- [
FREQUENCY
:
1 GHz
]
- [
SPAN
:
1 MHz
]
- [
REF
: REF LEVEL :
0 dBm
]
R&S FSP settings:
- [
FREQUENCY
:
1 GHz
]
- [
SPAN
:
0 MHz
]
- [
REF
: REF LEVEL :
0 dBm
]
- [
NETWORK
: SOURCE POWER 0 dBm ]
- [ MODULATION EXT I/Q ]
Measurement of residual
carrier:
Switch off I and Q channels of the generator.
Voltmeter display: DC voltage < 3 mV
AC voltage < 3 mV
Set marker to peak:
- [
MKR
: PEAK ]
Read measured value on spectrum analyzer (marker peak).
Measurement of impairments
(imbalance of I and Q path
):
Switch on I and Q channels of the generator.
Measure carrier amplitude at 1 GHz and lines at 1 GHz + 200 kHz
and 1 GHz – 200 kHz.
Содержание 1164.4391.03
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