VTI Instruments Corp.
APPENDIX B
62
SECTION
5
D
IGITIZER
M
ODULE
D
ESCRIPTIONS
O
VERVIEW
The Smart Dynamic Signal Analyzers family of products incorporates best-in-class analog design
methodology to deliver industry leading measurement accuracy. These instruments are ideal for a
wide range of applications including noise, vibration, and harshness (NVH); machine condition
monitoring; rotational analysis; acoustic test; modal test; as well as general purpose high speed
digitization and signal analysis.
D
IGITIZER
F
EATURE
C
OMPARISON
EMX-4250/4251
EMX-4350
EMX-4380
No. of Channels
4250: 16ch / 4251: 8ch
4
4
IEPE Input Type
Pseudo-Differential
Differential
Differential or Single-Ended
Max. Sample Rate (samples/s)
204.8k
625k
625k
Voltage Input (V)
0.1, 0.2, 0.5, 1, 2, 5, 10
0.1, 1, 10, 20
0.1, 1, 10, 20
Charge Input (kpC)
N/A
N/A
0.1, 1, 10
IEPE Current (mA)
4.5 mA, 10 mA
0 mA - 20 mA
4.5 mA, 10 mA
Input Coupling
AC, DC
AC, DC
AC
AC Coupling -3 dB Corner (Hz)
IEPE/Volts: 0.24 Hz
IEPE/Volts: 0.5 Hz
IEPE/Volts: 0.20 Hz
Charge: 0.32 Hz
Input Ground Isolation from Chassis
None
None
ON or OFF
ON: 50 V dc, 100 MΩ
Table 5.1: Digitizer Feature
P
OWER
C
ONSUMPTION
The table below shows the +3.3 Vdc and +12 Vdc current consumption drawn from the backplane
for each module. The current drawn from the +12 Vdc rail is shown for three common IEPE current
settings (all channels with the same setting): 0 mA, 4.5 mA, and 10 mA.
Model
Current Requirement (A)
Max.
3.3 V dc
12 V dc
Power
IEPE=0 mA
IEPE=10 mA
IEPE=4.5 mA
(Watts)
EMX-4350
1.32
0.46
0.56
0.51
12.3
EMX-4380
1.32
0.45
0.60
0.52
11.6
EMX-4250
1.64
0.60
0.96
0.76
16.9
EMX-4251
1.64
0.33
0.53
0.42
11.7
Model
EMX-4016
EMX-4016B
EMX-4016M
Power
NA
< 2W
12.5 Watt Typical, Vexc=10V, RL=350Ω
16.5 Watt Typical, Vexc=5V, RL=120Ω
20.0 Watts Max. Vexc shorted
Table 5.2: Power Consumption
