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A row of push-buttons is situated directly below the "Direct" and "Pre-
amplifier" inputs. Their functions are as follows.
INPUT:
CALIBRATION:
"Ref. 50 mV"
"Insert Volt. Cal.''
"Cal. Off"
GAl N CONTROL:
UNCAL.:
"Direct" input or input via an external
"Preamplifier" may be chosen by de-
pressing the appropriate push button.
Supplies the 50 mV RMS 1 kHz sine-
wave signal for internal calibration pur-
poses.
Choice of internal or external signal.
The internal signal is 50 mV from the
1 kHz sine wave generator. "External"
is for connection of an external frequen-
cy generator, see Section 3.2.4.
For reset of the other calibration but-
tons to a passive position.
For continuous control of the gain of
the first amplifier. When in position
"Cal" the gain is fixed. Maximum atten-
uation approx. 10 dB.
This light is lit when the GAIN CON-
TROL knob is not in the "Calibrated"
position.
INPUT SECTION ATTENUATOR: For attenuation of input signal by
10 dB steps. Voltages marked around
the knob show the maximum R MS in-
put voltage (for full scale deflection) for
each knob setting. By using the GAIN
CONTROL, input voltages up to 700 V
peak
can
be
measured.
See
sec-
tion 4.1.2.
OVERLOAD INDICATORS:
These indicate overload in input or out-
put amplifiers. While the lamp is lit the
meter reading is inaccurate and less than
the correct value.
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