Installation 2-5
2.13 Using Current and
Voltage Probes
When a LISN cannot be used – e.g. when measurements have to be made
on terminals other than the mains ones, such as load or command
terminals, sensitive to inserted capacities for example, or when LISNs of
adequate current capabilities aren’t available, or when the line voltage is too
high – a current or voltage probe can be used.
The characteristics of these probes, and some advises on their uses, are
given in §5 of CISPR 16-1-2.
The CISPR voltage probe contains a resistor with a minimum resistance of
1500 ohm, in series with a capacitor of negligible reactance vs. the
resistance (in the 150 kHz to 30 MHz range), and it is insulated at least up
to 1500V.
All these probes have an insertion loss and a frequency response that can
be stored in the memory of the PMM 9010, so that the actual readings of
the receiver can be automatically corrected by these characteristics values.
2.14 Using Antennas and
other Transducers
In the frequency range from 10 Hz to 30 MHz any other transducer can be
used to pick-up and measure RF conducted and radiated emissions, like
active and passive loop antennas, rod antennas, near field probes etc.
The characteristics of these transducers are usually specified in the
relevant standards (e.g. Military or Automotive Standards).
Their use with PMM 9010 is very easy, as it’s enough to enter their
response with the frequency into the memory of the receiver to have the
readings automatically corrected. When the cable is not calibrated together
with the transducer, even the cable loss can be entered.
2.15 The User Port
The PMM 9010 features on the rear panel a programmable User Port that
can be used to drive external devices or, more generally, to output signals
and data.
The User Port can easily be programmed and managed; the connector has
the following hardware connection:
PIN # Signal
1 IN3
2 IN1
3 + 12 VDC (max 50 mA)
4 OUT 0
5 OUT 2
6 OUT 4
7 USR-MISO
8 and 9 IN 2
10 IN 0
11 GND
12 OUT 1
13 OUT 3
14 USR-MOSI
15 USR-CLK
Data output (OUT 0 to OUT 4) and input (IN 0 to IN 3) are opto-coupled
TTL level with max. 1 mA draining.
Every other detail about User Port functionality is described in a separate
and more specific manual, available upon request.
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