VTI Instruments EX1629 - Wideband Output Configuration

VTI Instruments Corp.
34 EX1629 Preparation for Use
Voltage Measurement(1 of 48 channels)
TEDS
COMM
External customer
shunt cal
resistor terminals
Internal
Rcal
55K
-R Cal
+R Cal
8-pin telcom
connector (RJ-45)
350
120
User
10K
10K
+Excitation Sense
+ Excitation
- Excitation
+Excitation
+Sense
-Sense
+Excitation Sense
-Excitation Sense
* The parameter of the must be set to 0 V.negativeExcitationVoltage vtex1629_set_excitation function
-Excitation
-Excitation Sense
*
10K
10K
Instrumentation
Amplifier
+
-
x1
x10
x100
Hi
Lo
Shield
150
150
-Sense
-Cal
AGND
+Sense
Wagner
+Cal
AGND
430 kHz
LOW-PASS
FILTER
60.3 kHz
LOW-PASS
FILTER
ADC
TRIFILAR
FILTER
-Excitation Sense = 0 V
FIGURE 2-7: VOLTAGE MEASUREMENT CONFIGURATION (GROUNDED INPUT)
WIDEBAND OUTPUT CONFIGURATION
The wideband output connector, defined in Table 3-5, is a high-performance analog wideband
buffered output that can be connected to a high-speed digitizer for measuring structural vibration
levels. The Hi, Lo, and Shield pins of this connector are indicated in the shaded section of
Figure 2-8.
If a digitizer with a differential input will be connected to the wideband output, the Hi signal of
the digitizer should be connected to the Hi signal of the wideband output and the Lo signal of the
digitizer should be connected to the Lo signal of the EX1629.
If a digitizer with a single-ended input will be connected to the wideband output, the Hi signal of
the digitizer should be connected to the Hi signal of the wideband output and the ground of the
digitizer should be connected to the Shield pin of the wideband output connector.
NOTE The low-side of a single-ended digitizer should be isolated from chassis/earth ground.