VXi VT1529A/B 사용자 설명서
72 Programming the VT1422A & VT1529A/B for Remote Strain Measurement
The Full Bridge
configuration
Figure 3-12 shows the connections to the 8-pin telecom connector for a full
bridge configuration. It also shows a simplified schematic of the bridge
completion settings for a full bridge channel.
bridge configuration. It also shows a simplified schematic of the bridge
completion settings for a full bridge channel.
Note
While the diagram above shows amplifier gain in the measurement path,
the measurement values returned by these channels are corrected by the
VT1422A’s DSP (Digital Signal Processor) chip to reflect the actual value
at the user input terminal. The only time gain must be considered is when
the input voltage times the gain would overload the A/D range chosen with
a SENS:FUNC:... <range>,(<ch_list>) command. For example, with a
gain of 32, any input voltage greater than 0.5 V would cause an overload
reading even on the highest A/D range (16 V).
the measurement values returned by these channels are corrected by the
VT1422A’s DSP (Digital Signal Processor) chip to reflect the actual value
at the user input terminal. The only time gain must be considered is when
the input voltage times the gain would overload the A/D range chosen with
a SENS:FUNC:... <range>,(<ch_list>) command. For example, with a
gain of 32, any input voltage greater than 0.5 V would cause an overload
reading even on the highest A/D range (16 V).
Figure 3-12. Bridge Completion for a Full Bridge Channel
Buffer
To VT1422A
(VT1539A SCP)
X2
Buffer
RJ-45
OUTP:SHUNT:SOUR INT | EXT
OUTP:SHUNT ON | OFF
SENS:FUNC:STRAIN:<br_type>
or
SENS:STR:BRIDge:TYPE
CAL:REMote?
SENS:STR:EXC:STATE
SENS:STR:CONNect BRID | EXC
INP:FILT:FREQ
INP:FILT:STATe
X2
2:1
Mux
Cal-
Cal+
Strain
Bridge
8-pin telcom
connector (RJ-45)
Cal-
Cal+
350
120
customer
10k
10k
10k
10k
+
-
Optional
Filter
2,10,100Hz
+Excitation Sense
Instrument.
Amplifier
Dynamic Strain
Output
+ Excitation
-
Excitation
Internal
Rcal
50k
Local Rcal
Enable
Remote Rcal
Enable
Int/Ext Rcal
Select
Excitation Sense
from CHs 1-31
32:1
Mux
Mux
CH31
CH00
CH01
32:1
Mux
Mux
CH31
CH01
CH00
Bridge Sense
from CHs 1-31
External customer
shunt cal resistor
terminals
-R Cal
+R Cal
Current
Limit
Excitation
to CHs 1-7
enable excitation
CHs 0-7
Full Bridge
(channel 0 shown)
+Excitation
+Sense
-Sense
-R Cal
+R Cal
+Excitation Sense
-Excitation Sense
-Excitation
Wagner
Voltage enable
off for full bridge
-Excitation Sense
X16
Pin 5
RJ-45 Pin#
12345678
Pin 4
Pin 2
Pin 7
Pin 6
Pin 3
Pin 8
Pin 1