30
EQ CARD TEST PROCEDURES
1. 402 Equalizer Curve
Use the following test set-up parameters when measuring Full Range or High Frequency response
outputs:
A. Apply a signal of 850 Hz at 1 Vrms and adjust the amplifier's output to 6 Vrms.
B. Reference a dB meter to the output.
C. Measure the response according to the charts in Sections 1.1 and 1.2
1.1 402 Full Range Frequency Response
IMPORTANT: Set the Input Module's S2 switch to the Full Bandwidth (Full Range) position before
beginning this test.
1.2 402 High Frequency Response
IMPORTANT: Set the Input Module's S2 switch to the HF Only (High Frequency) position before
beginning this test.
FREQUENCY OUTPUT SPECIFICATION (dbr)
60 -3.7±1.5 dB
105 +8.5±1.5 dB
220 +3.5±1.5 dB
850 0.0
4000 +5.8±1.5 dB
14500 +13.3±1.5 dB
FREQUENCY OUTPUT SPECIFICATION (dbr)
60 -16.4±1.5 dB
105 -4.8±1.5 dB
220 +2.8±1.5 dB
850 0.0
4000 +5.8±1.5 dB
14500 +13.3±1.5 dB
2. 502A Equalizer Curve
Use the following test set-up parameters when measuring Full Range or High Frequency response
outputs:
A. Apply a signal of 600 Hz at 1 Vrms and adjust the amplifier's output to 6 Vrms.
B. Reference a dB meter to the output.
C. Measure the response according to the charts in Sections 2.1 and 2.2.
2.1 502A Full Range Frequency Response
IMPORTANT: Set the Input Module's S2 switch to the Full Bandwidth (Full Range) position before
beginning this test.
FREQUENCY OUTPUT SPECIFICATION (dbr)
40 -24.5±2.0 dB
140 +4.3±1.5 dB
600 0.0
2200 +3.5±1.5 dB
5000 +12.5±1.5 dB
15000 +19.0±1.5 dB
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