Features - VTI Instruments

Features - VTI Instruments
VT3243A
VXI
Technology™
4-channel Microphone/Voltage/IEPE Breakout Box
O verview
Transducer Signal Conditioning Accessory for the
VT1432B and VT1433B VXI Digitizer Modules
This Breakout Box accessory is specifically designed to
interface microphones (as well as voltage and 4 mA constant
current power supply accelerometers) to VXI Technology’s
high performance VT1432B and VT1433B VXI Digitizer
modules. It integrates four channels of signal conditioning
in one box, reducing the count of transducer conditioning
equipment needed for both small and large channel-count
VXI systems. Applications include both acoustic and
mechanical measurements. It has two input connector types
per channel to match the intended transducer connection,
as well as buffered outputs via BNC connectors for signal
monitoring or recording.
Features
Designed to work with the VT1432B
and VT1433B
The VT3243A is dedicated for use with the VT1432B and
VT1433B only and is designed for acoustic measurements
by providing the conditioning necessary for pressure and
free field microphones. It also provides conditioning for
mechanical measurements where voltage or 4 mA constant
current power supply accelerometers are to be used. Input
connections for each channel are via BNC for voltage and
4 mA constant current power supply and a 7-pin LEMO
connector for microphones.
4 input channels per breakout box
Complete software control of all
channel settings
Independent selection per channel
of voltage, IEPE or microphone mode
inputs
Independent buffered voltage output
per input channel for external
recorders
A 26-pin connector is provided for connection to the VXI
module through an extension cable. Each channel has a
program controlled float/ground switch to connect the input
connector shell to the chassis ground or to allow a floating
input.
Switched 200 V Polarization and 28 V
supply available at LEMO MIC input
A switchable 22.4 Hz high-pass filter is available to remove
low frequency noise from the microphone inputs
Switched -20 dB, 0 dB, and +20 dB
gain inputs on microphone inputs
The BNC input is a direct connection to the VXI module
with no amplification. The IEPE current source for powering
accelerometer transducers can be switched on or off under
program control. A light indicates when the current source is
on.
Switched 22.4 Hz high-pass filter
microphone inputs
Specifications
Microphone (LEMO) Input
Input impedance:
200 kΩ, nominal
Breakout box gains:
-20 dB, 0 dB, +20 dB
Full scale ranges:
With VT1432B
DSA
With VT1433B
282
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0.01 V to 50 V
(1, 2, 5 steps)
0.001 V to 50 V
(1, 2, 5 steps)
VT3243A
VXI
Technology™
4-channel Microphone/Voltage/IEPE Breakout Box
Gain accuracy:
±0.05 dB at 1 kHz
Flatness:
10 Hz to 88 kHz, Relative
to 1 kHz
±0.15 dB
Low frequency -3 dB point:
Noise:
Maximum input signal level:
20 Vp
Gain:
(Straight through connection)
1 V/V nominal
<0.4 Hz
IEPE current:
4 mA (nominal)
< 20 nV/ √ Hz
Open circuit IEPE voltage:
24V (nominal)
Noise (IEPE on):
< 50 nV rms / √ Hz
(Referred to input, 20 Hz to 88 kHz, 50 Ω input termination, 10 mVp VT1433B
range) A-weighted total noise is less than 8 dB SPL when used with a
50 mV/Pa microphone.
Monitor output buffer amplifier*
Distortion:
(Relative to full-scale output level of 0.1 Vp to 5 Vp)
With 2-meter cable
< -75 dB fs
With 20-meter cable
Fundamental frequency
≤ 25.6 kHz
-70 dB fs
Fundamental frequency
> 25.6 kHz to 44 kHz
-65 dB fs
Spurious responses:
(Relative to full-scale output level of 0.1 Vp to 5 Vp)
Maximum output signal level:
5V p
Output impedance:
1 kΩ (nominal)
Gain (at 1 kHz):
1 V/V ±1.0%
Flatness:
DC - 88 kHz, relative to 1 kHz
±3.0%
Channel-to-channel crosstalk:
<-100 dB typical
(Refered to input, at 10 kHz, 50 Ω input termination on
receiving channel, full scale signal on other channels)
20 Hz to 25.6 kHz
-80 dB
Noise:
-74 dB
(50 Ω input termination)
< 300 nV rms / √ Hz
25.6 Hz to 88 kHz
dc offset at main output:
<±10 mV
Distortion:
< -70 dBc
Channel-to-channel crosstalk:
(20 kHz, 50Ω input termination
on receiving channel, full-scale
signal on other channels)
<-80 dBfs
Spurious response:
50 Ω input termination,
10 Hz to 88 kHz
< -103 dB Vp
Channel-to-channel phase match:
50 Hz to 256 Hz
256 Hz to 20 Hz
20 Hz to 88 Hz
General
<±(0.017 - f/ 22000) °
<±f/ 44700 °
<±2 °
When used with the VT1433B, the phase match meets IEC
1043 Class 1 processor specifications.
dc polarization voltage:
200 V ±0.5%
(Program Selectable 0 V or 200 V; sourced through 1 MΩ)
28 Volt preamp power supply:
28 V at 5 mA
BNC input and IEPE supply
(All BNC input specifications apply with up to 20 V peak signal
level)
Breakout box power requirements:
(Maximum during normal operation)
+24 V current
250 mA
-24 V current
150 mA
Physical characteristics:
Height:
40 mm
Width:
175 mm
Depth:
190 mm
Weight:
1500 g
DSA
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949 • 955 • 1 VXI
283
VT3243A
VXI
Technology™
4-channel Microphone/Voltage/IEPE Breakout Box
Regulatory Compliance
Safety standards:
Designed for compliance to:
CSA 22.2, No 1010.1
UL 3111-1
Radiated emissions:
EN 55011 (CISPR 11,
Group 1, Class A)
(Tested in a typical
VT1432B system)
Immunity:
EN 50082-1
Environmental Operating
Restrictions: (including
Temp 0 °C to 50 °C
Humidity 20% RH to 90%
RH non-condensing
temperature, humidity,
altitude)
Configuration and Connectivity Information
Number of input channels:
4
Transducer connectors:
Female BNC and 7-pin
LEMO for each of 4
channels
Output connection:
One 26-pin Amp
750823-1 connector is
mounted on the box.
Monitor output:
One female BNC
connector per channel;
buffered version of
main output.
Cable to VXI module:
One 2-meter cable,
terminated at each end
with Amp 750833-1
connectors, connects
the breakout box to the
VXI module.
Optional active
extention cable:
A 20-meter cable with two
26-pin Amp connectors
The VT3243A 4-channel Microphone/Voltage/IEPE Breakout
Box is available in only one configuration and is designed
for use only with the VT1432B and VT1433B VXI Digitizer
modules. A 2m cable is supplied with the unit for connecting
to a VT1432B or VT1433B VXI digitizer module.
A rackmount kit is available which will allow two VT3243A
units to be installed side-by-side into a standard 19”
system rack. Order Option AXR for every two units to be
rackmounted.
Ordering Information
4-channel Mic/Voltage/IEPE Breakout Box
20 Meter Cable
VT3243A-AXR
Rack Mount Kit for 2 Breakout Boxes, 19”
VT3243A
284
VT3243A
VT3243A-AFL
DSA
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