Chapter 2 85
Instrument Functions: A - L
Det/Demod
Instrument Functions: A - L
2.4.1.6 Negative Peak
For each interval (bucket) in the trace,
Negative Peak detection displays the lowest sample
within the interval.
When
Negative Peak is selected, NPk appears on the left side of the display.
Key Path:
Det/Demod
Remote Command:
See “Detector” on page 79.
Example: DET NEG
2.4.1.7 Quasi Peak
Selects quasi peak detection. This is a fast-rise, slow-fall detector used in making CISPR
compliant EMI measurements. Quasi peak detection displays a weighted amplitude using
specific charge, discharge, and meter-movement time constants as described in CISPR
Publication 16.
Key Path:
Det/Demod
Dependencies/
Couplings: Whenever the quasi peak detector is selected, the resolution bandwidths
available will be the CISPR set described in the tables below. If the FFT
and Sweep setting is Manual:FFT
Quasi Peak is grayed out.
Table 2-2 CISPR Bandwidths with
RBW Set to Auto
Band Start
Frequency
Stop
Frequency
Bandwidth
A 10 kHz 150 kHz 200 Hz
B 150 kHz 30 MHz 9 kHz
C & D 30 MHz 1 GHz 120 kHz
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