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FREQUENCY DISPLAY:
COUNTING TIME:
AFC:
FREQUENCY RESPONSE:
METER AND RECORDER:
FREQUENCY SCALE:
FREQUENCY SCALE RANGE
SWITCH:
FREQUENCY INCREMENT:
FREQUENCY ADJUSTMENT:
16
wanted frequency from the VCO for low frequency analysis. See sec-
tion 3.1.5.
A six digit LED display shows the tuned frequency in kHz.
Determines the sampling period of the digital display. "0, 1 s
g1ves a
5 figure display, "1 s" gives 6 figure display. "1 s Analyzer Freq.
(When ext. tuned)" is used only when the rear panel socket EXT. VAR.
FREQ. is used as an input for an external tuning frequency.
Push button for selecting the Automatic Frequency Control phase de-
tector circuit. The AFC is active only in the four lower bandwidths
(3, 16 to 100Hz).
Three push buttons:
"Linear". The input signal is not filtered and the response is flat
(±
0,5 dB) between 2Hz and 200kHz.
"Selective". The input signal is filtered either by the analyzer or by an
extern a I fi Iter.
"Bandwidth Comp. ". Allows bandwidth compensation for power spec-
tral density measurements. Compensation
=
1 /vBandwidth(Hz).
"Analyzer". If the button is depressed, the output signal voltage from
the analyzer is indicated on the meter. The output of the analyzer is
fed to the RECORDER output.
"BFO". If the button is depressed, the output signal voltage from the
BFO is indicated on the meter. The meter full scale deflection is indi-
cated by the position of the BFO A TTENUATOR switch. The BFO output
voltage is fed to the RECORDER output.
The outer scale is logarithmic and extends over 3 decades from 20Hz
to 20kHz (see also FREQUENCY SCALE RANGE SWITCH). The inner
scale is linear from 0 Hz to 20kHz.
The central knob enables a mechanical sweep (manual or external
drive) to be made (provided the COUNTING TIME switch is not at "1 s
Analyzer Freq." or SWEEP CONTROL is not at "Ext. Volt."). The stand-
ard weighting network filters A, B, C and D, or a linear response
(2Hz-200kHz) may be selected by the scale pointer, unless an exter-
nal filter is selected.
A six position switch which selects either the linear or logarithmic (in-
ner or outer) frequency scale, and gives the choice of three scale fac-
tors,
x
0,1, x 1, and x 10.
A ten-turn potentiometer which allows fine adjustment around a se-
lected frequency. Three lights above the knob indicate whether the ac-
tual frequency
is
above, below or equal to the frequency selected on
the scale.
A screwdriver operated potentiometer which allows adjustment of 2,
20, or 200Hz according to scale factor. For compensation of long term
drift of the VCO at low frequencies, see section 3.1
.4.
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