User Manual

SIGLENT
SVA1000X Service Manual 15
Absolute Amplitude accuracy Test
Specification
Absolute amplitude accuracy
Preamp off
±0.4 dB, input signal -20 dBm
Preamp on
±0.5 dB, input signal -40 dBm
20 °C to 30 °C, fc = 50 MHz, RBW = 1 kHz, VBW = 1 kHz, peak detector,
attenuation = 20 dB
N-SMA
Power Meter
(NRP-Z91)
USB
SVA1000X
RF Generator
(SMB 100A)
RF OUT
Ref OUT
RF IN
TG OUT
Ref IN
Power divider
PC
BNC-BNC
N-SMA
N-SMA
USB
Figure 3-1 Absolute amplitude accuracy connections
Steps:
1. Connect the spectrum analyzer, signal generator and power meter as in
figure 3-1
2. Set the signal generator to output a sine waveform with 50 MHz frequency
and -20 dBm amplitude and enable the output
3. Configure the spectrum analyzer:
(a) Set the center frequency to 50 MHz
(b) Set the span to 1 MHz
(c) Set the attenuation to 20 dB
(d) Set the RBW and the VBW to 1 kHz
(e) Press Trace -> set the Times to 10, wait for trace average
4. Record measurement value P1 of the power meter
5. Press Peak to find the maximum value of the spectrum analyzer and record
the result P2
6. Absolute amplitude accuracy = P1 – P2
7. Change the preamplifier on and set the output amplitude of the signal
generator to -40dBm. Repeat steps 3 to 6 and record the results.