VTI Instruments Corp.
APPENDIX B
68
Figure 4-9: EMX-4380 Charge Amplifier Front-End Group Delay Frequency Response
B
REAK OUT BOX
O
UTPUT
The EMX-4016B/EMX-4016M BoB provides only one output per channel, which is directly fed
into EMX-4250/51 card. The EMX-4016B BoB is designed to provide, buffered analog output per
each input channel, in addition to feed into EMX-4250/51 card. For some high reliability
applications, IEPE signal conditioning Break-out-Box should have dual analog outputs, to support
system level functions, such as redundant recording, real time monitoring, independent control, etc.
The EMX-4016B Break out Box is essentially a 16 Channel Signal Conditioner, which is designed
for use with integral electronics piezoelectric (IEPE) transducers or piezoelectric transducers with a
Remote Charge Convertor (RCC). It supplies power to the transducer from a two wire constant
current source. This current source is controlled via EMX4250/51 card, and can be set to 4.5mA or
10mA as per software control.
The EMX-4016M Break out Box is essentially a 16 Channel Signal Conditioner, which is designed
for use with full bridge type sensors. It provides voltage excitation to the transducer. This voltage
excitation source can be set to 5V, 10mA and OFF as per the front panel switch.
Each channel has a Status LED Indicator to notify the user if the input conditions are healthy or
input has a fault (open or short circuit condition). The buffered analog outputs are AC coupled
though a 0.5Hz high pass filter, and has a fixed gain of x1. There are no user configurable jumpers
available in this BoB, since it is fully controlled via EMX4250/51 digitizer card.
The input power for the operation of this BoB is supplied by an external DC power adaptor (Delta
Electronics, Model # MDS-060AAS24 BA). This external power supply is compatible for use with
wide range of AC input (90Vac to 275Vac), and is provides low earth leakage, certified EMC
standards compliance according to EN 55011 for industrial, scientific and medical (ISM) radio-
frequency equipment and EN 55022 for Information Technology Equipment (ITE) radio-frequency
equipment.
The transducer input and buffered output connectors are electrically isolated BNC type sockets with
side connected to circuit common (no electrical channel to channel ground isolation). The input
connectors are on the front panel, along with LED indicators.
1.0E-8
1.0E-7
1.0E-6
1.0E-5
1.0E-4
1.0E-3
1.0E-2
1.0E-1
1.0E+0
1E-1
1E+0
1E+1
1E+2
1E+3
1E+4
1E+5
G
ro
u
p
De
lay (
se
c)
Frequency (Hz)
1.5nF
3nF
6nF
10nF
