Instruction Manual

Sound Level Meter Types 2245 – Instruction Manual Page 40 of 110
3.9.4 Accessories Included in EMC Test
The following accessories are connected to the instrument during the EMC tests:
 Mains Power Supply ZG-xxxx is connected to the 'USB' socket on the rear pannel
of 2245 using a USB cable AO-xxxx.
Detailed descriptions of the parts are given in Table 1.1.
3.9.5 Normal Mode of Operation During EMC Test
Testing Emission
The greatest level of radio frequency emission is radiated from the sound level meter
when set up as follows:
1) Make the connections described in section 3.9.4.
2) Arrange orientation as shown in Fig. 4.19.
3) Start a measurement and let it run during test.
Testing Immunity as a Sound Level Meter According to IEC 61672
The highest Susceptibility (Susceptibility = 1/Immunity) is achieved when the sound
level meter is set up as follows:
1) Make the connections described in section 3.9.4.
2) In Measurement settings > Input the following shall be selected:
 A 4966 microphone in Microphone,
 Free-field in Sound field,
 Disabled in Windscreen detect and
 None in Windscreen type.
3) Calibrate the microphone according to section 3.3.1.
4) Arrange orientation as shown in Fig. 4.19.
5) Excite the microphone with an acoustical signal as described in section 3.9.1.
6) Start a measurement and let it run during test.
7) For radio-frequency tests, observe L
AF
during test.
8) For power-frequency magnetic field tests, observe L
AF
, L
BF
, L
CF
and L
ZF
during test
(only two frequency weightings can be observed simultaneously).
Testing Immunity as a Frequency Analyzer According to IEC 61260
The highest Susceptibility (Susceptibility = 1/Immunity) for the filter sets is achieved
when the sound level meter is set up as follows:
1) Make the connections described in section 3.9.4.
2) Mount and calibrate the electrical substitute for microphones described in section
3.3.2 on the microphone preamplifier and short-circuit it.
3) In Measurement settings > Input the following shall be selected:
- A 4966 microphone in Microphone,
- Free-field in Sound field,
- Disabled in Windscreen detect and
- None in Windscreen type.
4) In Measurement settings > Spectrum parameters > Weighting Z shall be
selected.
5) Arrange orientation as shown in Fig. 4.19.
6) Start the measurement and let it run during test.
7) For radio-frequency tests, observe the L
ZF
spectrum at 1 kHz during test.
8) For power-frequency magnetic field tests, observe the L
ZF
spectrum during test.