Specifications 1617 and 1618
Band Pass Filters:
In accordance with IEC 225 1966. DIN
45651 and 45652, and ANSI S1.11-
1966 best classes
The total integrated random white noise
power passed by the filters in these in-
struments is equal to that which would
be passed by an ideal filter
Centre Frequencies 1617:
1/3 oct: 2 Hz to 160 kHz (50 bands)
1/1 oct: 2Hz to 20 kHz (41 overlapping
bands at 1/3 octave intervals covering
14 octaves)
Centre Frequencies 1618:
1/3 oct: 2Hz to 20 kHz (41 bands)
1/1 oct: 2Hz to 20 kHz (41 overlapping
bands at 1/3 octave intervals covering
14 octaves▶
Attenuation Outside Pass Band:
1/3 oct: > 75 dB at 5. and 1/5 cen-
tre frequency
1/1 oct: > 60 dB at 8. and 1/8 centre
frequency
Attenuation at Centre Frequency (fm):
1/3 oct and 1/1 oct: 0 c18 ± 0,5 dB
Maximum Peak-to-Valley Ripple:
1/3 oct: 0.5dB
1/1 oct: 0.5dB
Overall Selective Frequency Range:
1617: 1,4Hz to 180 kHz
1618: 1,4Hz to 22 kHz
Linear Pass Band (Available from Range
switch or Manual Filter Selector):
1617:
1,6Hz to 160 kHz attenuation is 0d8
± 0,3 dB
1 Hz to 200 kHz attenuation is 0dB
±0,5d)3
1618:
1,6 Hz to 31,5 kHz attenuation is 0dB
± 0,3 dB
1 Hz to 40 kHz attenuation is 0dB
± 0,5 dB
Filter Selection:
Type 1617:
2 Hz to 160 kHz
2Hz to 40 kHz, D. A, B, C, Linear
Type 1618:
2 Hz to 20 kHz, A, Linear
Switching control:
Manual: from -Manual Filter Selector"
Automatic: from a Level Recorder
Automatic: to control an X-Y Recorder
(1617 only)
(When scanning octave filters, either full-
octave or third-octave stepping can be se-
lected)
Automatic: via the IEC interface bus
(1617 only)
Weighting Networks:
Curves A, B. and C are in accordance
with IEC 179 for precision sound level
meters (1618 has A-weighting only)
Curve D is in accordance with IEC 537
Averaging Time Programmes (1617 only):
Used with Measuring Amplifiers that fea-
ture remote controlled averaging times
(Type 2607)
Programmes Available:
See Table 3 and Fig,8
Input:
Via B & K coaxial socket on front panel,
paralleled by 8NC socket on rear
Impedance:
1 M011 100 pr
Voltage:
1 V RMS nominal
5 V peak maximum
5,6V (± 0,3 V) overload warning lamp
lights
Distortion:
Band Pass Filters:
< 0,1% with 1V signal level
< 0.3% with 3,6 V signal level
Linear Range:
< 0,1% with 1V signal level
< 0,3% with 3,6V signal level
Noise:
< 150pV (typ. 100) Band Pass Filters
< 110pV (typ. 80) A, 8, and C-weighting
networks
< 250pV (typ. 180) D-weighting net-
work
< 100pV (typ 80) Linear range
Output:
Via 8 & K coaxial socket on front panel,
paralleled by BNC socket on rear
Impedance:
<500
Minimum Load Impedance:
5 MI ll 1 nF for less than ± 0,2% reading
error
DC Ramp Output (1617 only):
Used for controlling the X-axis of an X-Y
Recorder
0 V at the starting frequency
0,208 V per 1/3 octave increase rate
10,4 V maximum output
Load impedance > 10 kr1
Digital Bus Interface (1617 only):
Conforms with the proposed IEC Stand-
ard Digital interface for Programmable In-
strumentation
Contains the following functions
Acceptor Handshake (AH 1)
Listener Function (L2)
Remote Local Function (RL2)
Parallel Poll Function (PP2)
Environmental Conditions:
Operating Temperature Range:
5°C to 40°C (41°F to 104°F)
Storage Temperature:
—25°C to + 70°C (-13°F to + 158°F)
Permitted Humidity Range:
The outputs from the instruments are ac-
curate between 0 and 90% relative hu-
midity. provided there is no condensation
Power Requirements:
100, 115, 127, 200, 220. 240 V AC
± 10%
50 to 400 Hz
1617: approx. 37 VA
1618: approx. 30 VA
Comply with IEC 348 Class II
Cabinet:
Supplied as model A (light-weight metal
cabinet), El (model A in a mahogany cab-
inet). or C (as A but with flanges for
standard 19" rack mounting)
Dimensions:
Height: 133 mm (5,25 in)
Width: 430 mm (16,9 in)
Depth: 200 mm (7,9 in)
Weight:
1617: 6,5 kg (14,31b)
1618: 6,3 kg (13.91b)
Accessories Included:
1 AN 0010 Power cable
2 JB 0002 Banana plug
2 JP 0035 BNC plug
2 JP 0101 B & K coaxial plug
1 JP 0703 7-pin DIN plug
1 JP 0802 8-pin DIN plug
2 VF 0012 Fuse
Accessories Available:
See Fig 12
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