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i
with the deflection of the meter and 1 V ms
(about 2.8 Vp-p)
is
displayed when the meter reads the rated full scale.
23)
Pull and rotate the REF ADJ control
(lo) .
The meter is now
uncalibrated.
The meter deflection can be increased continuously
by about 10 dB.
The UNCAL light
(ll)will be on in this case.
Set the output amplitude display of the oscillator to "10.0 dB.
Press the RANGING key
@
to set the AUTO mode, and rotate the REF
ADJ knob
(lO)
so that the meter reads 0 dB.
Then proceed to the
next step.
24) The HPF and LPF do not affect the operation because the oscillator
frequency is set to 'l.000 kHz.
Changing the frequency,
the filter
effect can be checked.
Press the FREQ * key of the MODE select keys
(22)
to place the
analyzer in the frequency-up/down mode and to display the frequency.
25)
Turn off the HPF 400 Hz (2l) ,
LPF 30 kHz
(20) ,
and LPF 80 kHz
(5)
keys with the LED in each key off.■ The HPF key
(21)
is turned on
and off independently.
The LPF keys
(20) ,
(S)
are toggled,
so
pressing only the key with the LED on turns both LED's off.
26)
The WEIGHTING key
(l8)
is effective only when the optional weighting
filter is installed within the analyzer.
If fitted, turn it off.
The key has no effect and remains off in a standard model.
27) Check the deflection of the level meter,
changing the oscillator
frequency from 5 Hz to 159.9 kHz.
The deviation from 0 dB set in
step 23)
indicates the output amplitude characteristics of the
analyzer.
(For stringent checking,
a 600-ohm termination pad
should be inserted at the INPUT A connector).
28) Turn each of the three filters on and read the meter,
varying the
oscillator frequency to check the characteristics of each filter.
The characteristics of the weighting filter can also be checked if
it is installed.
N
o
<N
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!
CO
03
C5
4-13
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