Tenma 72-490 Manual

Audio Generator
Highly versatile compact audio generator is perfect for sound system and speaker component testing. Its
high precision and remote VCO input make it suitable for the serious test environment, yet its compact
size and low cost make it suitable for any tool box. This device is designed to be connected to the line
level of any consumer or commercial designed audio amplifier. While it is designed to be used with
unbalanced inputs, it is also suitable for balanced equipment.
Features
▪Rotary output frequency adjustment
▪Independent sine and square wave outputs, each
with their own level control
▪VCO input for remote frequency setting
▪1/4" unbalanced outputs
▪Selectable 0dB/10dB output attenuator
▪AC adaptor included
Operation
• Prior to connecting to amplifier input, make certain the AC adaptor is connected to the Audio
Generator and the SINE LEVEL and SQR LEVEL are set to the minimum.
• Make certain the amplifier power is switched off.
• Set the PAD button to the IN (-10dB) position.
• Using a suitable shielded audio cable, connect either the SQR OUT or SINE OUT to your amplifiers
input. Note: It is possible to use these two outputs simultaneously on two separate amplifier
channels.
• Switch the amplifier power on.
• With the amplifier set at a normal listening level, slowly increase the output LEVEL of the Audio
Generator until the tone reaches the desired level. Make certain that you adjust the LEVEL that
corresponds to the output that is being used (either SINE or SQR).
• If the maximum level setting does not reach the desired output level, reduce the LEVEL control
to minimum and change the PAD button to the NORMAL position. Again, slowly increase the
output LEVEL of the Audio Generator until the tone reaches the desired level.
• Adjust the FREQUENCY control to the desired tone frequency.
Model 72-490
Specifications
▪Frequency range: 20Hz~20KHz ±1dB
▪VCO input: 1.2~5.0VDC for full frequency output
▪Output level: +11dB (sine), +14dB (square)
▪Output impedance: 100ohm
▪THD (sine wave): 1%
▪Power requirements: 12~16VDC, tip polarity (–)
▪Dimensions: 1.57" (H) x 4.49" (W) x 2.87" (D)