DreamCatcher ME1400 EMI Manuale di avvio rapido - Pagina 8

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Test 2: Measurement of the 10 MHz Sine Wave Output in the Presence of Motor Noise

Figure 2 – Experimental Setup for the Measurement of a 10 MHz Sine-wave Output in the

1. Supply a 5 V input voltage to the EMI Source Module.

2. Switch S5 to the 'ON' position to turn on the 10 MHz Sine Wave Oscillator.

3. Use a digital oscilloscope to probe test point TP11 with respect to GND, which is the output of

the 10 MHz Sine Wave Oscillator. You should observe a pure sinusoidal waveform.

4. Next, switch S4 to the 'ON' position to turn on the brushed DC motor. Observe the output of

the Sine Wave Oscillator in the presence of motor noise. Describe the differences as

compared to the observations made in Step 3.

5. Switch S4 and S5 to the 'OFF' position.

6. Connect the output of the 10 MHz Sine Wave Oscillator (J8) to the RF In port of the N9912A

FieldFox RF Analyzer using an RF coaxial cable.

7. Power on the N9912A FieldFox RF Analyzer.

8. Set the N9912A FieldFox RF Analyzer to operate in the Spectrum Analyzer mode. Select the

start and stop frequencies, and other settings according to the following configuration:

Mode

Start Frequency

Stop Frequency

N9912A Setting: "[ ]": Hardkey; "{ }": Softkey

Set Mode to SA measurement: [Mode] > {SA}

Set Start Frequency to 5 MHz: [Freq/Dist] > {Start} > [5] > {MHz}

Set Stop Frequency to 15 MHz: [Freq/Dist] > {Stop} > [15] > {MHz}

Set output power level to LOW: [Meas Setup 4] > {Output Power} > {Low}

Scale: [Scale/Amptd] > {Autoscale}

Perform Calibration: Normalization

ME1400 EMI and EMC

Presence of Motor Noise

: SA

: 5 MHz

: 15 MHz

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