Applications
Introduction
3
3-3
3-1. Introduction
With its unique combination of features such as true rms, frequency, dB,
relative reference and the 4½ digit display, the 8060A offers a wide variety
of measurement capabilities, including measurement of amplifier bandwidth,
the Q factor, amplifier stage gain in relative dB, and some other general
audio applications. You can also find out how to change the dB reference
impedance or how to use the 8060A to measure extremely low currents.
These applications may be of immediate use to you, or they may help you
discover other ways the 8060A can fill your measurement needs.
3-2. Determining Amplifier Bandwidth
The following procedure describes how to use the ac voltage dB, relative,
and frequency functions to determine the bandwidth of an amplifier (for
frequencies up to 100 kHz):
1. Connect the amplifier, signal generator, load, and 8060A as shown in
Figure 3-1.
2. On the 8060A, select the ac voltage function and a range appropriate for
the amplifier output.
3. Adjust the signal generator for a signal level that is within the input
operating range of the amplifier. Beginning at a low frequency (20 Hz),
steadily increase the frequency until the ac voltage reading on the
8060A begins to rise. Typically the ac voltage reading will rise to a
peak, level out, and then begin to fall, much like the response curve
shown in Figure 3-1. (High quality audio amplifiers will probably not
show a rise in readings since they are generally flat from 20 Hz to >20
kHz. In this case, use 1 kHz as a midband reference for 0 dB in Step 4.)
4. When the peak or the upper plateau of ac voltage readings has been
reached, press the dB button and then the REL (relative) button on the
8060A. This establishes the 0 dB relative reference.
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