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Test Procedures
R&S SMU200A
1007.9845.82
1.28
E-12
Internal Modulation Generator
Test equipment
Spectrum analyzer (Table 1-2, item 24)
AC/DC voltmeter (Table 1-1, item 19)
Test setup
Connect the spectrum analyzer to the LF socket of the DUT.
For level measurement connect the AC/DC Voltmeter to the LF
socket of the DUT.
Measurement of frequency
settings and distortion
Settings on DUT:
LF Output
menu:
LF Gen Voltage
1 V
Vary
LF Gen Frequency
from 0.1 Hz to 1 MHz.
Settings of the spectrum analyzer:
RF INPUT
DC
AMPT REF LEVEL
10 dBm
FREQ CENTER
= LF Gen Frequency
SPAN
= LF Gen Frequency / 10
Read the actual frequency from the spectrum analyzer using Marker
function SIGNAL COUNT.
Settings of the spectrum analyzer:
FREQ START
= LF Gen Frequency / 2
STOP
= LF Gen Frequency * 5
BW / FILTER TYPE
= FFT
at higher frequencies use
TRACE AVERAGE
to smooth
display
Use MARKER to read the power of the fundamental and the
harmonic spectral lines.
The distortion is calculated from the summed power of the
spectral lines of the harmonics related to the fundamental.
Recommended test frequencies
for frequency settings
1 kHz, 33.3333 kHz, 1 MHz
Recommended test frequencies
for distortion
100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz
Measurement of the level
Settings on DUT:
LF Output
menu:
LF Gen Frequency
1 kHz
Vary
LF Gen Voltage
from 0 mV to 3 V
Measure the output level with the AC/DC voltmeter.
Recommended settings
3 mV, 10 mV, 30 mV, 100 mV, 300 mV, 1 V, 3 V
Summary of Contents for R&S SMU200A
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