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10.12.2.3.4 Detector
10.12.2.4 Conversion
factor
10.12.3 Limit
This menu allows the operator to select the most appropriate detector for
the test.
In Sweep mode the Peak, Average, RMS (Root Mean Square) and Quasi-
Peak detectors are available and can be selected via the appropriate button.
Hold time (ms)
The Hold Time (expressed in milliseconds) represents the time the receiver
uses to "take a snapshot" of the incoming signal and to measure it with the
chosen detector. When selecting a detector, the default hold time value is
automatically loaded, but in some cases this time is not appropriate, e.g.
when the interference signals have a low repetition rate. In this case the
PMM 9010 sees a high input signal and therefore tries to set the proper
attenuation automatically increasing the value or the input attenuators.
However, when the input attenuation is set the signal is gone, so the receiver
lowers the attenuation, but then a new peak arrives, and so on and so forth.
On the other hand, if the Hold Time is too high the PMM 9010 cannot
properly follow the signals.
In this situation the Hold Time value should be manually set to find a correct
compromise.
To set the Hold Time to the lowest possible value (this value dynamically
depends from the measurement conditions), enter the figure 0; if a value
lower than the allowed is entered, the lowest possible value is automatically
selected.
The max. Hold Time that can be set is 30 sec (30.000 ms).
When using a transducer to make a measurement – a Voltage or Current
Probe, an Antenna, etc. – there is always the need to add to the measured
values the conversion factor of the transducer in use.
The Conversion factor may also take proper account of losses as cable loss,
attenuators added externally to the receiver, etc.
The PMM 9030 can handle these factors in an automatic way and directly
correct the readings.
The PMM 9030 can store in its internal non-volatile memory up to 4 different
correction factors, and use them one at a time when recalled.
However, the Conversion Factors shall be created and loaded via the PMM
9010 Software Utility.
Load the conversion factor with the relevant button, and NONE to unload it.
Each emission standard has one or more limits the User shall comply with.
The PMM 9030 receiver has the possibility to load and activate one limit with
the simple click of a button.
The preloaded standard limits refer to the most popular EMC emission
standards: CISPR22, CISPR14 and CISPR11.
Other limits – or any custom designed limit – can be created, managed,
selected and loaded through the PMM 9010 Software Utility running on a PC.
These additional custom limits cannot be stored in the memory of the PMM
9030, but only in the one of the PC where the 9010SW Utility is running.
The limits are shown on the scan display and they appear like a thin black
line .
By pressing the NONE button all limits are deactivated.
PMM 9030 Frequency Extension
10-27
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