Elenco Electronics AM-550TK Instruction Manual download pdf (Page 14)

If an oscilloscope is not available, skip the following test and go directly to Section 2.

-13-

Output Adjust

Amps COM V/Ω

10μFGenerator

Figure 7

Battery

GND

R15

GND

R15

Connect the VOM and generator to TP6 as shown in

Figure 7.

Turn the power ON. Normally the AC gain is measured

at a frequency of 1 kilohertz (kHz). Your VOM, however,

may not be able to accurately read AC voltages at this

frequency. It is recommended, therefore, that this test

be performed at 400Hz. Set the generator at 400Hz and

minimum voltage output. Set your VOM to read an AC

voltage of 1 volt at the output of your Audio Amplifier.

Slowly increase the output of the generator until the

VOM reads 1 volt AC. Leave the audio at this setting

and move the positive lead of your VOM to TP6. Record

the AC voltage input to the amplifier here:

Vin=___________ volts.

You may have to change scales on your VOM for the

most accurate reading. Turn the power OFF. The AC

voltage gain of your Audio Amplifier is equal to the AC

output voltage divided by the AC input voltage, or 1/Vin.

Your calculated AC Gain should be approximately 10.

AC GAIN

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Elenco Electronics AM-550TK Instruction Manual Page 14