BRUEL & KJAER 1623 - Page 12

A special filter · is included in the
1 623 to attenuate the 1 kHz syn-
chronization signal which precedes
Filter Frequency Range:
2Hz to 20kHz continuously tunable from
tachometer input
Manual Tuning:
2Hz to 200Hz
200Hz
to 20kHz
Filter Bandwidth:
Switchable effective noise bandwidths of
6%, 12%, and 23% ( ~ 1/ 3 octave) con-
stant percentage bandwidth plus linear
position
(3 dB bandwidths of 5,4% , 10,8% and
21,7%)
Filter Type:
Two-pole Butterworth band-pass filter
Filter flank Slope: 12 dB/ octave. (See
Fig .1.)
Octave selectivity (±1 dB):
6% B/ W 57,5 dB
12% B/ W 45,5 dB
23% B/ W 34 ,1 dB
Dynamic Range:
> 60 dB under 1 V RMS plus crest factor
4
Digital Display:
Gas display shows filter centre frequency
Overall accuracy: ± 1 . 5%
Filter Input:
BNC socket
Max. level: 4 V peak
Input impedance: 1 MO
Max. DC offset: 42 V DC
Filter Output:
BNC socket
Output impedance: < 1 0
Load impedance: ;;. 500 0
DC offset at output: < 2 mV
Filter Gain:
0 dB with following accuracy
Bandwidth 2 Hz to 2kHz 2kHz to 20kHz
6%
± 1 dB ± 2dB
12%
± 0,5 dB ± 1 dB
23%
± 0,25 dB
± 0 ,5 dB
additionally + 0 dB -1 dB accuracy for fil-
ter sweep in accordance with Fig.5
each test band on the B & K Stereo
Test Records OR 2009 and OR
2010. An instrumentation set-up
Specifications 1 623
Noise:
< 1 mV RMS
Distortion:
< 0,1%
Tuning Signal ("Tachometer") Input:
BNC socket (with double shield)
20 mV to 1 20 V peak-to-peak
Max. Signal: including DC offset 42 V
RMS
Maximum noise: 20 mV peak-to-peak
Input impedance: 1 0 MO
Frequency range: 2 Hz to 20kHz
Power supply for pickup on inner shield
of socket + 7. 5 V (direct internal connec-
tion to battery )
Trigger Level:
Adjustable + 1 V to -1 V
Hysteresis: 20 mV
Sweep Rate:
See Fig.5
Frequency Multiplier:
1/ 99 to 99 / 1 of tuning signal frequency
Output of Tuned Frequency for Recorder
Synchronisation:
Rear panel connection through 8-pin DIN
socket
1 . Log f
----7 pulse for B & K Level Recor-
der Types 2306 and 2309
Max. sweep rate: 2 s/ decade
Frequency accuracy of pulse out-
put:± 2%
2. Log
f~DC for X-Y recorder e.g. Type
2308
Range 2Hz to 20kHz covers 0 to 7 V
Output impedance: 2,2 kO
Max. sweep rate: 2 s/ decade
Frequency accuracy of DC output:
±2%
for performing harmonic distortion
measurements on gramophone pick-
ups is shown in Fig.1 0.
Environmental Conditions:
The instrument performs within specifica-
tions under the following conditions :
Temperature: -1 0°C to + 50°C
Humidity: 0 to 95% relative humidity,
non condensing
Electromagnetic: Field strengths up to
100A / m
Internal Power Supply:
6 x NiCd rechargeable cells
Operating capacity: 8 hours continuous
External Power Supply:
Rear panel connection through 7-pin DIN
socket
Requires+ 6 V to+ 15 V, 3,5 W
Battery Charger:
B&KTypeZG0113
Input: 1 00 to 1 30 V AC or 200 to 240 V
AC
Output : 12 V 400 rnA. Short circuit pro-
tected
Time for complete recharge: approx. 1 4
hours
Dimensions: (excl. feed knobs etc.)
Height: 133 mm (5,2 in)
Width : 210 mm (8,3 in)
Depth: 200 mm (7,9 in)
(B & K module cabinet KK 0025 . 6/ 12
of 1 9" rack module)
Weight:
Including batteries, 3,2 kg (71b)
Accessories Included:
3 BNC plugs JP 0035
7-pin DIN plug JP 0703
8-pin DIN plug JP 0802
6 NiCd cells QB 0008
Battery charger ZG 011 3
Spare fuses VF 0032
Accessories Available:
Photoelectric Tachometer Probe MM
0012
Sweep Unit Type 5555