BRUEL & KJAER 1623 - 2 Controls; Front Panel

2.1. FRONT PANEL
Filter Center Frequency
Brtiel&KjSIII'
Tracking
Filter
Type 1623
Tachometer
Input
20mV - 120V
Max. 42V RMS
2. CONTROLS
Trigger Level Bettery
r- Manual Tuning/ Preset ~
.
200Hz
1
20kHz
2Hz 200Hz
•
Recorder
Sync .
~
r--- Tracking Mode ~
Tachm . Filter Noise
Input Input Ma nual Filter
r-- r-- r-- --
- . I
Bandwidth
6% 12%
23%
Lin .
I
Fig.2. 1. Front panel of the Tracking Filter Type 1623
FILTER CENTER FREQUENCY: A digital display of the centre frequency to which the filter is tuned;
with either Hz or kHz illuminated.
Frequency: When illuminated indicates that the signal from the tuning
source selected (possibly modified by the setting of the TRACKING FRE-
QUENCY
MULTIPLIER knobs) is outside the frequency range 2 Hz to
20kHz. Synchronisation signals to recorders are blocked when the Fre-
quency lamp lights but synchronisation is not lost.
Amplitude: When illuminated indicates that the filter input signal level
exceeds 4 V peak.
Preset: When illuminated indicates that the filter is not being tuned by
a
Tachometer Input signal or Filter Input signal and is therefore auto-
matically tuned to the frequency determined by the setting of the MAN-
UAL TUNING/PRESET knob multiplied by the N/ D ratio set on the
TRACKING FREQUENCY MULTIPLIER.
Track: When illuminated indicates that the filter is being tuned by the
tuning signal selected by depressing either the Tachometer Input or
Filter Input or Manual pushbuttons.
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