24
Step 3: Output Level and Clipping
Note: This test should be performed as briefly as possible.
1. Set the TSG to the 1kHz setting.
2. Set the FSM to the RMS/Peak A-Weighted mode.
3. Adjust the drive level to achieve 2 amps of output current.
4. Measure the field strength. Achieve 0dB by using the FSM’s
indicated field strength to work out the extra current required. For
example: if the measured field strength on the FSM is (A-RMS)
-6dB then 6dB (2X) extra current will be required to achieve 0dB
(see Note 1 on page 27).
Note: If more than 7.9dB is required to achieve 0dB, a different
3. Set the TSG to the 1kHz setting.
4. Set the FSM to the Third Octave F= 1000Hz setting.
5. Adjust the line level until “Good” is displayed.
6. Adjust the drive level to achieve 2 amps of output current.
7.
Set the TSG to the pink noise setting and record the value
measured by the FSM.
8.
Set the FSM to the Third Octave F= 100Hz setting and record
the value measured.
9.
Set the FSM to the Third Octave F= 5000Hz setting and
record the value measured.
10.
If the difference between the values measured at 1000Hz and
5000Hz is less than 3dB, record the results and move on to
Step 3: Output Level and Clipping. If the difference is higher than
3dB, move on to step 11.
11. Increase the HF comp and repeat steps 3 to 10.
