3-8 Amplitude Accuracy Chapter 3 — Spectrum Analyzer Verification
3-16 PN: 10580-00324 Rev. N S412E MM
Do this for both Sensor A and Sensor B. This sets the power meter to use the proper power sensor cal
factor. Press the System key to display the power reading.
9. Adjust the MG3692x output level so that Sensor A reading is –2dBm±0.1dB.
10. Record the Sensor B reading into the –2dBm column in Table A-13, “Spectrum Analyzer Amplitude
Accuracy Across Frequency Setup Table” on page A-9.
11. Adjust the MG3692x output level so that Sensor A reading is –30 dBm ± 0.1 dB.
12. Record the Sensor B reading into the –30 dBm column in Table A-13.
13. Adjust the MG3692x output level so that Sensor A reading is –50 dBm ± 0.1 dB.
14. Record the Sensor B reading into the –50 dBm column in Table A-13
15. Repeat Step 7 through Step 14 for all the frequencies listed in Table A-13.
Amplitude Across Frequency Measurements
1. Disconnect Sensor A from the 10 dB Fixed Attenuator and then install the 34NN50A Adapter to the end
of the attenuator.
2. Connect the open end of the 34NN50A Adapter to the RF In connector of the S412E as shown in
Figure 3-2 on page 3-14.
3. On the S412E, press the Shift key and then the Mode (9) key. Use the rotary knob to highlight
Spectrum Analyzer and then press the Enter key to switch to Spectrum Analyzer mode.
4. Preset the S412E by pressing the Shift key, then the Preset (1) key, then the Preset button on the
touchscreen. Using the Sweep menu, change the Sweep Mode to Performance.
5. Touch the BW main menu button and set the RBW to 1 kHz and VBW to 10 Hz.
6. Set the Span to 10 kHz.
7. Press the Freq soft key and set the Center Frequency to 100 kHz.
8. Press the Amplitude soft key and set the Reference Level to –40 dBm and turn the Pre-Amp On.
9. Set the Attenuation Level to 15 dB.
10. Set the power meter to display Channel B. Press the Sensor key, the Cal Factor soft key, and then the
Freq soft key. Use the numeric keypad to enter the value matching the frequency of MG3692x as the
input signal frequency. This sets the power meter to use the proper power sensor cal factor. Press the
System key to display the power reading.
11. Set the MG3692x frequency to 100 kHz CW and adjust the level so that the power meter displays a
reading which matches the Sensor B reading for –50 dBm in Table A-13.
12. On the S412E press the Marker main menu button and then the Peak Search submenu button.
13. Record the Marker 1 amplitude reading in Table A-14, “Spectrum Analyzer Amplitude Accuracy Across
Frequency” on page A-10.
14. Calculate the deviation by subtracting –50 dBm from the Marker 1 amplitude reading. Record the result
in Table A-14.
15. Verify the deviation value is within the specification.
16. Repeat Step 7 through Step 15 for other frequencies, input power, reference level, attenuation, and
pre-amp settings in Table A-14.
Note
To maintain test setup integrity, do not disconnect Sensor B, the Power Splitter or the Fixed
Attenuator.
Note Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
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