Keysight N9038A, Service Manual, Page: 738 / 745

Keysight N9038A MXE Service Guide 757
Tests
Intermittent, Unsteady, Drifting Disturbances
4. Preset the EMI receiver by pressing Mode Preset .
5. Tune the EMI receiver to 125 kHz with a span of 0 Hz by pressing FREQ
Channel, Center Freq, 125 kHz then SPAN X Scale, Zero Span .
6. Set the RF Coupling to DC by pressing Input / Output, RF Input, RF
Coupling DC (instruments with option 544 are always DC coupled so this
step is skipped for them).
7. Set the Sweeptime to 3 seconds by pressing Sweep / Control, 3 s .
8. Change the detector used by the EMI receiver to EMI Average by pressing
Trace / Detector, More, Detector, More, EMI Average .
9. Put the EMI receiver in single sweep operation by pressing Single .
10. Turn on the continuous peak function by pressing Peak Search, More,
Continuous Peak Search On .
11. Take a single sweep on the EMI receiver by pressing Restart .
12. Once the sweep on the EMI receiver has completed and the auto peak
value is found record the marker amplitude as the Sine Wave Measured
value for the frequency being measured in Table 22-71 .
13. On the signal generator turn the modulation On .
14. Take a single sweep on the EMI receiver by pressing Restart .
15. Once the sweep on the EMI receiver has completed and the auto peak
value is found record the marker amplitude as the Pulsed RF Measured
value for the frequency being measured in Table 22-71 .
16. Calculate the Delta between the Sine Wave and Pulsed RF measurements
with the following formula and enter the value in Table 22-71 for the
frequency being measured.
Delta = Pulsed RF Measured – Sine Wave Measured
Table 22-71 EMI Average – CISPR 16-1-1 :2010 Section 6.5.4
Frequency
(MHz)
Pulse Width
(sec)
Sine Wave
Measured
(dBm)
Pulsed RF
Measured
(dBm)
Lower Limit
(dB)
Delta
(dB)
Upper Limit
(dB)
0.125 0.16 -10.5 -7.5
10 0.16 -10.5 -7.5
100 0.10 -10.5 -7.5
500 0.10 -10.5 -7.5
1100 0.10 -10.5 -7.5