Chapter 2 Performance Verification Test RIGOL
DG4000 Performance Verification Guide
Spurious Signal Test
Specification:
Sine Wave Spectrum Purity
Spurious signal
(non-harmonic)
Typical (0 dBm)
≤10 MHz: <-65 dBc
>10 MHz: -65 dBc+6 dBc/octave
Test Procedures:
1. Connect CH1 of DG4000 with the RF input terminal of the spectrum analyzer
using the dual-BNC cable and N-BNC connector as shown in Figure 2-4
. Press
Preset at the front panel of DG4000 to restore the instrument to its default
setting.
2. Configure DG4000:
a) Set the output impedance of CH1 to 50 Ω (press Utility CH1Set Resi
to select “Load”).
b) Output a sine waveform with 10 MHz frequency, 0 dBm amplitude and 0 V
DC
offset.
c) Press Output1 to enable CH1.
3. Set the spectrum analyzer:
a) Set the reference level to 10 dBm and the input attenuation to 20 dB;
b) Set the start frequency to 0 Hz and the stop frequency to 100 MHz;
c) Set the resolution bandwidth to 1 kHz;
d) Set the peak excursion to 3 dB;
e) Set the sweep mode to single;
f) Press Peak to find the maximum peak.
4. Measure the maximum spurious signal (except the harmonics) using cursor
measurement and record the measurement result A. Subtract 0 dBm from A and
compare the result with the specification.
5. Keep other settings of DG4000 unchanged and set the output frequency of
DG4000 to 50 MHz, 100 MHz (only for DG4102, DG4162 and DG4202), 150 MHz
(only for DG4162 and DG4202) and 200 MHz (only for DG4202) respectively.
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