Elenco Electronics AM-550TK Instruction Manual download pdf (Page 13)

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Amps COM V/Ω

1MΩ

Figure 6

Battery

GND

R15

Adjust your VOM to read 9 volts DC. Connect the

positive lead of the VOM to TP6 and the negative lead

to any ground. Turn the power ON and record the

voltage at TP6 here:

V1=________ volts.

Place resistor R4 across resistor R13 as shown in

Figure 6.

The voltage at TP6 should drop to a lower value.

Record that lower voltage here:

V2=__________ volts.

Remove R4 from the circuit and move the positive lead

of the VOM to TP8. Record the voltage at TP8 here:

V3=__________ volts.

Once again, parallel resistor R13 with resistor R4 as

shown in Figure 6. The voltage at TP8 should also drop

to a lower voltage. Record the new reading at TP8

here:

V4=__________ volts.

Remove R4 from the circuit but leave your VOM

connected to TP8 for the next test. Turn the power OFF.

Since the DC GAIN equals the DC change at the output

divided by the DC change at the input, the DC gain of

this amplifier is (V1-V2)/(V3-V4). Your calculated

answer should be very close to 1.

If you do not have a generator, skip the following test and go directly to Section 2.

DYNAMIC MEASUREMENTS

DC GAIN

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Elenco Electronics AM-550TK Instruction Manual Page 13