VTI Instruments Corp.
APPENDIX B
64
Figure 4-20: EMX-4250/4251 Block Diagram
EMX-4016B Block Diagram
Figure 4-21: EMX-4016B Block Diagram
Figure 4-5: EMX-4016M Block Diagram
I
NPUT
T
YPES
Voltage
The EMX-4350 and EMX-4380 have BNC input connectors that are isolated from chassis ground.
The center conductor connects to HI and the outer shell connects to LO. The maximum voltage
applied to each input (differential plus common mode) cannot exceed ±20 V. A floating source
needs to have a DC path to ground through some resistance to make sure the common mode voltage
stays close to ground.
The EMX-4250/51 have 25pin microD connectors and voltage signals applied to each input
channels using EMX-4016/EMX-4016B/EMX-4016M Break out box. These Break out boxes pass
through the signals directly from the input BNC connector to the 25pin microD connected to the
EMX-4250/51 without any signal conditioning.
+24V
IN+
MUX
LPF3
204.8ksps
24-bit ADC
Self-
CAL
IEPE
TEDS
10V,5V, 2V, 1V,
0.5V, 0.2V, 0.1V
EMX-4250
Bias
Test
HPF
PXIe
Decimating
Dig. Filter
Gain & Offset
Calibration
100
BOB I2C Control
BNC
IN
Bi-Color
LED
HPF
LED
Interface
BNC Out
BOB w Buffer Out
D
S
U
B
IN-
BNC
Cal
±10Vpk
PS+
PS-
P-
P+
Vexc
10V/5V
50mA
EMX-4016M
Full Bridge
4-Wire
1
6
2
3
S-
S+
Shield
DC/DC
8
7
BNC Out
±10Vpk
Gain=1
DSUB to
EMX-4250
4
5
+RCal
-RCal
