B&K Precision 2658A - Manual - Manual (Page 57)

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19.6 Frequency Counter
This function currently not supported.
20. EMI Test (2651)
20.1 Additional Function for EMI Test
Detection mode (Refer to “13.4 Setting of Detection mode”)
By pushing , the detection mode can be set.
POS SMPL NEG QP AV
In the 2651, QP detection and AV detection are added for EMI measurement.
POS (Positive Peak) : The spectrum of the maximum value between the sample points
SMPL (Sample) : The spectrum of the momentary value between the sample points
NEG (Negative Peak) : The spectrum of the minimum value between the sample points
QP (Quasi Peak) : The spectrum of the quasi peak value between the sample points
AV (Average) : The spectrum of the average value between the sample points
As for QP detection, the following characteristics are chosen according to RBW settings.
(based on CISPR16)
RBW charging
time constant
dis-charging
time constant
meter
time constant
9kHz 1ms 160ms 160ms
120kHz 1ms 550ms 100ms
• Preset (Initialization) (Refer to “18. Save / Load”)
In the 2651, the radiated emission measurement and the conducted emission measurement are added to the
preset as a default setting.
By pushing , the menu is displayed
NORMAL : The initial parameters of normal mode are set.
EMI-C : The initial parameters of conducted emission measurement are set.
EMI-R : The initial parameters of radiated emission measurement are set
In the radiated mission measurement, “USER” is selected as an antenna.
It is necessary to input the compensation data of antenna beforehand.
F6
F6 SWEEP
F6 SAVE/LOAD
F1
F2
F3