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23
FREQUENCY/AMPLITUDE display
LED's indicate frequency in four digits and amplitude in three
digits and a minus sign
(if needed).
The displayed frequency is
the frequency of the oscillator in this instrument and also the
tuning frequency of the distortion meter.
The amplitude indicates
the output level provided by the built-in oscillator defined
across a 600-ohm load.
Amplitude unit indicator
One of the two LED's lights to indicate the unit
(dB or dBm)
of
the indicated output amplitude.
DISPLAY key
Selects frequency or amplitude alternately; frequency is indicated
when the LED in tile key is off, and amplitude is indicated when
the LED is on.
The LED on/off is dominated by the mode selector
keys
(22) , however,
this key can work alone at any time.
MEASUREMENT keys
Three keys select the measurement functions: level,
S/N,
or
distortion.
The LED in the selected key lights.
INPUT LEVEL meter
Indicates the level of the signal input to the measurement section.
This meter is used for monitoring input, levels during S/N or dis¬
tortion measurement.
A meter with an average responding
characteristic has been calibrated for the rms value of a sine
wave.
Meter range indicator LED's
These 16 LED's indicate selected meter ranges.
In level measure¬
ment, one out of 16 lights will be on to indicate the range of the
meter on the right (J) ..
In S/N or distortion measurement;
one of
the upper six LED's lights to indicate the range of the input level
meter on the left,
and one of the remaining 10 lights to indicate
the range of the meter (^) on the right.
Indicator
The level,
S/N,
distortion sire indicated by this meter which mea¬
sures true rms values.
N
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4-2
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