
a resistance range when the meter is not in
us. The test leads might be accidentally
shorted allowing the internal battereries
to become consumed.
6
Volume Level Measurements.
Audio output of a tube radio and amplifier where both
DC and AC currents are present is checked on AC voltage
ranges by placing a non-polarized condenser of 0.1-2
microfarads in series with a meter terminal to block
DC component.
This is called AF (audio frequency)
output measurement, for which any AC voltage range
can be used reading the scale for AC voltage measure
ments.
On the other hand, what matters to amplifiers and trans
mission circuits is their input-output power ratio, which
is gain (amplification) or loss (attenuation) of the circuit.
Comparative reading by voltage, current or power would
annoy one with the odd figures to be obtained by calcula
tion, while the response of the human ear is analogous to
logarithmic variation, voltage, current and power ratios
are usually expressed as follows:
— 23 —
Содержание U-50D
Страница 1: ...f i1 ...
Страница 2: ......
Страница 32: ...Note The static capacity of electrolytic condensers can not be checked 30 ...
Страница 34: ...Arrangement of Parts Rear View 32 ...
Страница 37: ...T CO LTD SANWAMETfR TOKYO Kakuta Bldg 1 MO Yushima Bunkyo ku ...