Q:

IEPE Circuit Model

Do anybody have a circuit model of a IEPE Loop? 
I am requiring to model the response of IEPE loops for checking how the frequency response of a sensor can or cannot be degraded under changes on the design i am currently having - cable, DAQ, etc.
Some details here, without parameters enabling me to model anything.
https://www.pcb.com/Resources/Technical-information/tech_signal#collapse13
The loop components are:

A data acquisition module DAQ,
An IEPE sensor,
A cable between them.

The main parameters are the following:

DAQ Excitation Current $I$, 
DAQ Excitation Voltage $V$,
DAQ Impedances. Here i am also not clear on which the current & voltage vary under changes on the IEPE variable gain,
Cable per length parameters: impedance, capacitance, inductance, resistance,
Sensor variable "gain/impedance". In here i am not clear on which parameters i should consider over the IEPE (pre)amplifier embedded with the sensor.

For more details, if they are eventually required, just check this previous post:
PCB 393B04 IEPE Accelerometer + NI 9230 DAQ
Thanks in advance.

A:

IEPE stands for Integrated Electronics Piezo Electric 

it defines a class of accelerometer that has built in electronics. 

usually low impedance output electronics that work on a two wire
constant current supply with an voltage output on a DC voltage bias.
The IEPE technology has generally replaced most 3 wire accelerometers and is broadly used for most applications except DC stable, high temp, 4-20mA in SCADA 
There are many different type of accelerometers

This is what you need

