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1
C4
Fig. 1-2
Simplified block diagram of the VP-7721A
The distortion meter measures the true rms values.
A high-pass filter
and two low-pass filters built in the circuit assure accurate measure¬
ments,
free from unwanted frequencies or noise.
Distortion character¬
istics of the input signal can be monitored at the Monitor output with
external equipment
(oscilloscope or spectrum analyzer)
to provide
additional analysis of the distortion products.
1.4
Level Meter
The AC level meter section of the VP-7721A.measures the true rms value
of input voltage from 0.1 mV full scale to 100 V full scale at 1, 3 and
10 steps in 13 ranges.
The meter has dual scales of dB
(0 dB = 1 V rms)
and dBm (600 ohms, 1 mW) , and it can be used over the range of 30 |iV to
112 V, -98 dBm to 43 dBm, and -100 dB to 41 dB including the extended
scale above the rated full scale.
Ranges can be switched manually or
automatically.
The REF ADJ
(reference adjustment)
control is used
conveniently for measuring signal levels relative to a reference level
on the meter.
The monitor output is used when this instrument is used
as a high-sensitivity preamplifier.
1-3
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