AUSTRALIAN MONITOR AMC+120 - Page 24

FINAL TESTING
REQUIREMENTS FOR FINAL TESTING:
a) THD meter
b) Load 80Ω
c) Multimeter
d) Oscilloscope
e) Microphone
f) Variac
5. THD
Setup
Signal generator = 260mVAC, 1kHz
Signal in = XLR
Master pot = min (CW)
Output metering = 100Vout
Load = 80ohm
Procedure
Turn up master pot to 70VAC (+/-1.0VAC) on output. Measure THD.
(P/F) Reading shall be < 0.5%.
Values to be recorded:
Value Pass Range
5. THD 0% – 0.5%
6. Sensitivity
6.1. Inputs
Setup
Signal generator = 260mVAC, 1kHz
Signal in = XLR
Master pot = max (CW)
Output metering = 100Vout
Load = 80ohm
Procedure
Set channel pot to max.
(P/F) The output reading shall be 100VAC (+/- 10VAC).
7. Bandwidth
Setup
Signal generator = 260mVAC, 1kHz
Signal in = XLR
Master pot = max (CW)
Output metering = 100Vout
Load = 80ohm
Procedure
Set the volume pot so the output is 70VAC. Adjust the frequency on the signal
generator down till the output is 50VAC.
(P/F) The frequency shall be <75Hz.
Adjust the frequency on the signal generator up till the output is 50VAC.
(P/F) The frequency shall be >20kHz.