Daytronic 10A73-4 Bedienungsanleitung
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10A73-4
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
Intended primarily for stress analysis applications, the Model 10A73-4 receives and
conditions up to
four independent inputs from one-arm (1/4-bridge), two-arm (1/2-
bridge), and four-arm (full-bridge)
strain gage configurations attached directly to the
stressed material.
If you are measuring strain by means of a one-arm (1/4-bridge) strain gage configura-
tion, BE SURE TO STUDY SECTION 4 FOR A DISCUSSION OF “LEAD WIRE AND NON-
LINEARITY EFFECTS WITH QUARTER-BRIDGE STRAIN GAGE CONFIGURATION.”
Unless all four inputs originate from full-bridge transducers, the 10A73-4 requires
external completion of each strain gage input to
full bridge, by means of one of the fol-
lowing:
• aSystem 10 Bridge Completion Connector—one of the following models:
—
10QBC-4-120 for 2- or 3-wire 120-Ω quarter-bridge connections
—
10QBC-4-350 for 2- or 3-wire 350-Ω quarter-bridge connections
—
10QBC-4-1K for 2- or 3-wire1000-Ω quarter-bridge connections
—
10HBC-4 for 4- or 6-wire half-bridge connections
—
10FBC-4 for 5-wire full-bridge connections
• a Daytronic Model 10CJB-4 Quad Bridge Completion Card (described in Sec-
tion 2.b)
1
;
• equivalent circuitry supplied by the user
2
When the 10A73-4 is used with one of the System 10 Bridge Completion Connectors
listed above, the excitation level is
fixed at 5 V-DC. In the absence of a Bridge Com-
pletion Connector—whether or not the
Model 10CJB-4 is used—the 10A73-4 provides
selectable low-level excitation (1, 2, or 5 V-DC) to help reduce gage heating effects in
materials with low thermal conductivity.
3
However, the selection of excitation level for
the 10A73-4 is not “per channel”;
the same level applies to all four 10A73-4 channels.
See Section 3.a for details.
As explained in Section 3.b, the 10A73-4 can be quickly calibrated either through
“calculated” calibration—involving application of the
MVV command—or through a
convenient shunt technique. Unless a System 10 Bridge Completion Connector is
being used with the 10A73-4, all four shunt resistors may be switched in and out
simultaneously by means of logic-level inputs through the rear I/O CONNECTOR.
1
The 10CJB-4 contains a switch for easy selection of the common excitation level.
2
If you wish to provide your own bridge-completion circuitry, you should contact the factory for
instructions on connections and calibration.
3
A special modification must be made to the 10A73-4 card to allow selectable excitation when a
System 10 Bridge Completion Connector is attached.
MODEL 10A73-4
1/2 & 1/4 BRIDGE STRAIN GAGE
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A73-4.1
1.E.2.10A73-4
SYSTEM 10
ANALOG INPUT CARDS
ADDITIONAL 10A73-4 SPECIFICATIONS
Transducer Types
: 1-arm (1/4-bridge), 2-arm (1/2-bridge), or 4-arm (full-bridge)
strain-gage configurations. 2-wire or 3-wire 1/4-bridge configurations may use
either 120 Ω, 350 Ω, or 1 kΩ nominal gage resistance; full-bridge configurations
should use 350-Ω gages (or higher) or should use 120-Ω gages with either 1-V or 2-
V excitation. Unless all four inputs originate from
full-bridge transducers, the Model
10A73-4 requires either an appropriate System 10
Bridge Completion Connector;
a
Model 10CJB-4 Quad Bridge Completion Card; or equivalent bridge-comple-
tion circuitry supplied by the user.
Transducer Ranges: ±0.750, 1.500, or 3.000 mV/V; for System 10 channel “type”
codes assigned to 10A73-4 data channels, see Table 1
Excitation (for all four channels): Sensed excitation selectable 1, 2, or 5 V-DC (i.e.,
±0.5, ±1, or ±2.5 V-DC, respectively), nominal
Amplifier (per channel):
Common-Mode Range
: ±0.4 V operating; ±5 V without instrument damage
Common-Mode Rejection Ratio: DC: -90 dB; at 60 Hz, 1 kHz, and 3 kHz: -120 dB
Input Impedance: Differential: greater than 100 MΩ; Common-Mode: greater than
100 MΩ
Offset: Initial: ±0.04% of full scale; vs. temperature: ±20 ppm/°C; vs. time: ±10
ppm/month
Gain Accuracy*: ±0.02% of full scale with 5-V excitation; ±0.02% of full scale with 1-V
or 2-V excitation
typical, following calibration
Gain Stability: vs. temperature: ±50 ppm/°C; vs. time: ±20 ppm/month
Filter: 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at 100 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 100 msec
To 0.1% of final value: 150 msec
To 0.02% of final value: 600 msec
Auxiliary Output: Filtered outputs available on mainframe wire-wrap pins
Table 1 10A73-4 “Type” Codes
Full-Scale Channel
Input Type Code
0.750 mV/V 70
1.500 mV/V 71
3.000 mV/V 72
2 GAGE / TRANSDUCER CONNECTIONS
Table 2, below, gives pin assignments for the 10A73-4’s rear I/O CONNECTOR, to
which appropriate BRIDGE COMPLETION CIRCUITRY must be attached, unless all four
inputs originate from full-bridge transducers.
Section 2.a describes the cabling to be used with System 10
Bridge Completion
Connectors
.
Section 2.b describes the cabling to be used with the
Model 10CJB-4 Quad Bridge
Completion Card
.
10A73-4.2 GAGE / TRANSDUCER CONNECTIONS
10A73-4 QUAD 1/2 & 1/4 BRIDGE DC STRAIN GAGE CARD
* Initial (uncalibrated) inaccuracy with 1-V or 2-V excitation may be as great as ±0.1% of full scale.
Maximum error that could occur upon replacement of a Model 10A73-4 not followed by cali-
bration is ±0.2% of full scale.
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10A73-4 |
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