PRL500 - 900 - 1300 B i a s C a l i b r a t i o n
Required Test Equipment:
• Function Generator
• 20 Mhz Dual-channel Oscilloscope
• Power Load Bank (4Ω - 350W min.)
• Variac (0V ac – 230V ac, 15A)
Test Procedure
Connections:
• Connect the Function Generator output on CH1 input Jack or XLR socket.
• Connect the Power Load Bank with Speakon on the output sockets.
• Connect the Dual-channel Oscilloscope on Binding Post outputs.
• Set the Variac at 0V and connect its output to the mains cable of the amplifier.
Verifying:
• Switch on the amplifier, then rise the Variac voltage till 230V. In same time the
relays are activated and the protect red led turns off.
• Set the amplifier in parallel mode.
• Set the Function Generator on 1KHz sinewave at 0.2V RMS and check on the
Oscilloscope monitor the output signals have the same amplitude and phase.
• Verify that on the sinewave there is not the “crossover distortion”. (*)
Only if the “crossover distortion” is present adjust the trimmer VR1 for CH1, VR2
for CH2.
(*)
sinewave without sinewave with
“crossover distortion” “crossover distortion”
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