Bruel & Kjaer - 2693 Conditioning Amplifier Specifications
Charge Input
CONNECTOR: TNC
(TNC to 10.32UNF adaptor JP-0162 included)
GROUNDING: Single-ended or floating
MAX. INPUT:
Differential Charge: 10 nC (peak); Type 2692-C/D: 100 nC (peak)
Common Mode Voltage: 4.2V (peak)
At gain ≥ 0.316 mV/pC (.10 dB gain with 1 nF transducer
capacitance)
INPUT PROTECTION:
Differential Charge: ≤300 nC (peak)
Common Mode Voltage: ≤15V (peak)
COMMON MODE REJECTION RATIO: >50 dB (typical)
(50 to 60Hz with 1 nF transducer capacitance)
AMPLIFIER GAIN:
0.1mV/pC to 10 V/pC (.20 to +80 dB gain with 1 nF transducer
capacity); Type 2692-C/D: 0.01 mV/pC to 10 V/pC (.40 to +80 dB
gain with 1 nF transducer capacity)
TRANSDUCER SENSITIVITY RANGE:
10.19 to 10.6 C/MU
(MU = mechanical units: m/s2; g, N, lb., Pa)
CALIBRATED OUTPUT:
Selectable in 10 dB steps. 100 dB attenuator range, 10.15 to
107 V/MU (Type 2692-C/D: Selectable in 10 dB steps. 120 dB
attenuator range, 10.16 to 107 V/MU)
}1% for 0°C ≤ Ta ≤ +40°C and }2% for
.10°C≤Ta ≤+55°C
Frequency range from 5 × fl to 0.2 × fu
fl = lower freq. limit: 0.1, 1.0 or 10 Hz
fu = upper freq. limit: 0.1, 1, 3, 10, 30 or 100 kHz
FREQUENCY RANGE (.10%):
Acceleration: 0.1Hz to 100 kHz (transducer cable length <10m);
Velocity (optional): 1.0Hz to 10 kHz
Displacement (optional): 1.0Hz to 1 kHz
LOW-PASS FILTER (.10%):
0.1, 1, 3, 10, 22.4, 30 or 100 kHz, attenuation slope 40 dB/decade
HIGH-PASS FILTER (.10%):
Acceleration: 0.1, 1.0 or 10 Hz; Type 2692-C/D: 0.1, 1 or 20 Hz
Velocity (optional): 1.0 or 10 Hz
Displacement (optional): 1.0 or 10 Hz
INHERENT NOISE (2 Hz to 22.4 kHz):
<5 fC referred to input, .10°C≤Ta ≤+40°C
<10 fC referred to input, 40°C≤Ta ≤+55°C
(amplifier sensitivity (>20 dB) with 1 nF transducer capacitance)
HARMONIC DISTORTION AND NOISE (2 Hz to 22.4 kHz, Qin
≤2 nCpeak, Vout ≤3.16V peak):
<0.003% for amplifier gain ≤0.1 V/pC
(<40 dB gain with 1 nF transducer capacitance)
ENVIRONMENTAL SUSCEPTIBILITY (referred to input):
Magnetic Field: <0.2 fC/(A/m)
Electromagnetic Field: <20 fC/(V/m) or <4 fC/V
Vibration (10 to 500Hz): <30 fC/(m/s2)
MOUNTED RESONANCE TESTING1: EP Patent 715.722, US
Patent 5.753.793
Mounted resonance testing of the accelerometer and cable
interconnection, controllable from front panel and
RS.232 interface
TEST TONE OSCILLATOR:
ω= 1000 rad/s (159.2Hz), sinusoidal
Test Level: 1mV to 10 V (}1%). Controllable from front panel and
RS.232 interface
Reference Tone: 1V (RMS), (}1%), 159.2Hz
RISE TIME: >7.5V/μs (100 kHz bandwidth)
CHANNEL TO CHANNEL PHASE-MATCH:
2.1° . 0.1° × (f/fl) from fl to 20 × fl
0.1° from 20 × fl to 0.1 × fu
(f/fu)° from 0.1(fu) to fu
fl: lower freq. limit: 10 Hz
fu: upper freq. limit: 0.1, 1, 3, 10, 30 or 100 kHz
OPTIONAL FILTERS:
Integration: Single and double
Type 2692-C: Single and double integration filters included
Type 2692-D: Single and double integration filters optional
Microphone Input
CONNECTOR: 7-pin LEMO
GROUNDING:
Outer shield grounded to chassis
INPUT IMPEDANCE:
1MΩ|| 300 pF (AC coupled)
MAX. INPUT: 31.6V (peak)
INPUT PROTECTION: ≤50 V (peak)
AMPLIFIER GAIN:
.20 to +60 dB (80 dB with reduced specs.)
TRANSDUCER SENSITIVITY RANGE:
10.12 to 103 V/MU
(MU = mechanical units: Pa, mm)
CALIBRATED OUTPUT:
Selectable in 10dB steps. 100 dB attenuator range, 10.15 to 107V/MU
(}0.1 dB for 0°C ≤ Ta ≤ +40°C and }0.2 dB for .10°C≤Ta ≤+55°C
Frequency range from 5 × fl to 0.2 × fu
fl = lower freq. limit: 0.1 or 20 Hz
fu = upper freq. limit: 0.1, 1, 3, 10, 22.4, 30 or 100 kHz)
POLARIZATION VOLTAGE (}0.5V or }0.25%):
0 or 200 V (all channels simultaneously selected, short-circuit
protected)
PREAMPLIFIER SUPPLY:
Fixed }14 V, }40 V or controlled automatically in accordance with
input range (short-circuit protected)
FREQUENCY RANGE (.1 dB):
0.1Hz to 100 kHz (gain ≤60 dB) (complies with IEC 1260 Class 0
and ANSI S1.11 Type 0.AA for fl = 0.1Hz and fu = 100 kHz)
HIGH-PASS FILTER (.1 dB):
0.1Hz, attenuation slope 40 dB/decade or
20 Hz, attenuation slope 80 dB/decade
LOW-PASS FILTER (.1 dB):
0.1, 1, 3, 10, 22.4, 30 or 100 kHz, attenuation slope 40 dB/decade
A-WEIGHTING FILTER:
Complies with IEC 61672.1
INHERENT NOISE (referred to input, gain >20 dB):
<2 μV A-weighted
HARMONIC DISTORTION AND NOISE (2Hz to 22.4 kHz, Vin
≤ 20V peak, Vout ≤ 3.16V peak):
<0.003% for amplifier gain ≤40 dB
ENVIRONMENTAL SUSCEPTIBILITY (referred to input):
Magnetic Field: <0.2 μV/(A/m)
Electromagnetic Field: <10 μV/(V/m) or <10 μV/V
Vibration (10 to 500 Hz): <2 μV/(m/s2)
CHARGE INJECTION CALIBRATION1:
Verification of the entire measurement set-up including the
microphone, preamplifier and connecting cable. Controllable from
front panel and RS.232 interface
Reference Tone: 1V (RMS) }1%, 1 kHz
OVERLOAD DETECTION:
Microphone preamplifier overload detection with respect to cable
length (3 to 1000 meter)
RISE TIME:
>7.5V/μs (100 kHz bandwidth)
CHANNEL TO CHANNEL PHASE-MATCH:
5.1° . 0.1° × (f/fl) from fl to 50 × fl (fl=0.1Hz)
2.1° . 0.1° × (f/fl) from fl to 20 × fl (fl=20Hz)
0.1° from 50× fl to 0.1 × fu (fl = 0.1Hz)
0.1° from 20 × fl to 0.1 × fu (fl = 20 Hz)
(f/fu)° from 0.1(fu) to fu
Where:
fu = upper frequency limit: 0.1, 1, 3, 10, 22.4, 30 or 100 kHz
OPTIONAL FILTERS:
A-, B-, C- and D-weighting (one module)
(complies with IEC 61672.1)
Intensity Input
Specifications as for microphone input, except when using the
.Intensity. filter.
CONNECTOR:
7-pin LEMO (two connectors on two input modules . adaptor
required)
CHANNEL TO CHANNEL PHASE-MATCH AND FREQUENCY
RESPONSE (with .Intensity. filter (20Hz HP/22.4 kHz LP, 40 dB/
decade):
Complies with IEC 61043 standard Class 1 and ANSI S1.9.1996
Class 1, with Brüel & Kjær sound intensity probes.
(Conditions: output sensitivity for the two channels must be equal.
Transducer sensitivity must be equal within 0.5 dB)
DeltaTron® Input
CONNECTOR: BNT
GROUNDING: Single-ended or floating
INPUT IMPEDANCE:
1MΩ || 100 pF (AC coupled)
MAX. INPUT:
Differential Voltage: ≤31.6V (peak)
Common Mode Voltage: 4.2V (peak)
INPUT PROTECTION:
Differential Voltage: ≤50 V (peak)
Common Mode Voltage: ≤15 V (peak)
COMMON MODE REJECTION RATIO:
50 dB (50 to 60 Hz) (typical)
AMPLIFIER GAIN:
.20 to +60 dB gain (80 dB with reduced specs.)
TRANSDUCER SENSITIVITY RANGE:
10.12 to 103 V/MU
(MU = mechanical units: m/s2, m/s, g, N, lb., Pa)
CALIBRATED OUTPUT
Selectable in 10 dB steps. 100 dB attenuator range, 10.16 to 107 V/
MU.
(}0.1 dB for 0°C ≤ Ta ≤ +40°C and }0.2 dB for .10°C≤Ta ≤+55°C
Frequency range from 5 × fl to 0.2 × fu
fl = lower frequency limit: 0.1, 1.0 or 10 Hz
fu = upper frequency limit: 0.1, 1, 3, 10, 22.4, 30 or 100 kHz)
CONSTANT CURRENT SUPPLY (}15%):
+4mA or +10mA with a +28V voltage source
Tacho Probe Supply:
+8 V DC at BNT inner shield (short-circuit protected)
FREQUENCY RANGE (.10%):
0.1Hz to 100 kHz (gain <60 dB)
attenuation slope 40 dB
HIGH-PASS FILTER (.10%):
0.1Hz or 1.0Hz (with attenuation slope 40 dB) or
10 Hz (with attenuation slope 60 dB/decade)
LOW-PASS FILTER (.10%):
0.1, 1, 3, 10, 22.4, 30 or 100 kHz
INHERENT NOISE (referred to input, gain >20 dB):
<2.4 μV A-weighted
<3.3 μV lin. 2Hz to 22.4kHz
HARMONIC DISTORTION AND NOISE (2 Hz to 22.4 kHz, Vin
≤ 20V peak, Vout ≤ 3.16V peak): <0.003% for amplifier gain ≤40 dB
RISE TIME:
>7.5V/μs (100 kHz bandwidth)
ENVIRONMENTAL SUSCEPTIBILITY (referred to input):
Magnetic Field: <0.2 μV/(A/m)
Electromagnetic Field: <3 μV/(V/m) or <3 μV/V
Vibration (10 to 500 Hz): <2 μV/(m/s2)
OVERLOAD DETECTION:
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Bruel & Kjaer - 2693 Conditioning Amplifier 
$ 650
