Rohde & Schwarz SMU200A - Internal Modulation Generator

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
:
F
REQ 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 t
he
har
monic 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 m
enu:
L
F 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