Daytronic 10A74-4C Bedienungsanleitung
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10A74-4C
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
Intended primarily for stress analysis applications, the Model 10A74-4C 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.”
To minimize “time-skew” effects, each 10A74-4C input has a separate TRACK/HOLD
circuit. Upon application of a “HOLD” command, the channel will instantly freeze its
present value in analog memory until application of a “TRACK” command, whereupon
normal tracking of the input signal is resumed. By applying a “HOLD” command
simultaneously to all four channels, the user can be assured of a set of readings
coherent to within a few microseconds.
As explained in Section 3.e, the TRACK/HOLD function is normally controlled through
an external logic signal to the 10A74-4C’s rear I/O connector, when a System 10
Bridge Completion Connector or the optional Model 10VAC is not being used. When
the conditioner is used in a “B-sized” System 10 mainframe (only), the TRACK/HOLD
function may be alternatively controlled through an optional Model 10A1 Control Sig-
nal Card mounted in the same “A-card” rack.* Setup of the 10A1 for use with the
10A74-4C is discussed in Section 3.b.
Unless all four inputs originate from full-bridge transducers, the 10A74-4C 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);
• equivalent circuitry supplied by the user**
* In System 10, the Model 10A1 uses the same system bus as the Model 10A11 Thermocouple
Processor Card; therefore, a “10A” THERMOCOUPLE CONDITIONER such as the Model
10A9-8C or 10A10-4 cannot be used in the same System 10 “A-card” rack as a Model 10A1.
** If you wish to provide your own bridge-completion circuitry, you should contact the factory for
instructions on connections and calibration.
MODEL 10A74-4C
QUAD STRAIN GAGE TRACK-HOLD
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A74-4C.1
1.E.2.10A74-4C
SYSTEM 10
ANALOG INPUT CARDS
The 10A74-4C provides selectable low-level excitation (1, 2, 5, or 10 V-DC). Using low
excitation helps reduce gage heating effects in stress analysis of materials with low
thermal conductivity. Note, however, that with the 10A74-4C, the selection of excita-
tion level is not “per channel”; the same level applies simultaneously to all four 10A74-
4C channels. As explained in Section 3.a, selection of the common excitation is
accomplished by
on-board programming jumpers only (even when a Model 10CJB-4
is connected).
1
Any 10A74-4C strain gage channel with external bridge completion can be calibrated
by either CALCULATED or SIMULATED (SHUNT) calibration; the standard “TWO-
POINT (DEADWEIGHT)” method does not apply to such channels. In this case, “calcu-
lated” calibration uses the
SCALING FACTOR (EMM) command instead of the MV/V
CALIBRATION (MVV)
command. For shunt calibration, all four shunt resistors may
be switched in and out simultaneously by software command or—when a System 10
Bridge Completion Connector or the Model 10VAC is
not being used with the 10A74-
4C—by means of logic-level inputs through the rear I/O CONNECTOR.
The Model 10VAC Voltage Input Adaptor is a special screw-terminal connector
assembly which allows the 10A74-4C to receive up to four independent
external ana-
log signals
in place of its normal strain gage inputs, when it is desired to apply the
special TRACK/HOLD function of the 10A74-4C to these analog voltage signals. The
analog signal source must provide its own power supply; the Model 10A74-4C’s stan-
dard excitation lines cannot be used.
2
For instructions on connection and use of the
Model 10VAC, see Section 5, below.
ADDITIONAL 10A74-4C SPECIFICATIONS
Transducer Types
: 1-arm (1/4-bridge), 2-arm (1/2-bridge), or 4-arm (full-bridge)
strain-gage configurations; minimum allowable gage resistance will depend on
bridge excitation and gage configuration, as shown in Table 1, below. Unless all four
inputs originate from
full-bridge transducers, the Model 10A74-4C requires either an
appropriate System 10
Bridge Completion Connector; a Model 10CJB-4 Quad
Bridge Completion Card
; or equivalent bridge-completion circuitry supplied by the
user. With the optional
Model 10VAC Voltage Input Adaptor, the Model 10A74-4C
can receive up to four external analog signals in place of its normal strain gage
inputs (see Section 5).
Table 1 Model 10A74-4C Minimum Gage Resistances
Bridge Gage Minimum
Excitation Configuration Gage Resistance
10 V-DC 1/4 & 1/2 Bridge 350 Ω
10 V-DC Full Bridge 350 Ω
3
5 V-DC 1/4 & 1/2 Bridge 120 Ω
5 V-DC Full Bridge 350 Ω
2 V-DC 1/4 & 1/2 Bridge 120 Ω
2 V-DC Full Bridge 60 Ω
1 V-DC 1/4 & 1/2 Bridge 60 Ω
1 V-DC Full Bridge 60 Ω
10A74-4C.2 GENERAL DESCRIPTION AND SPECIFICATIONS
10A74-4C QUAD DC STRAIN GAGE TRACK-HOLD CARD
1
The 10CJB-4’s internal excitation selection switch does not apply to the Model 10A74-4C.
2
When the 10VAC is used with the 10A74-4C, the card’s excitation level must be set to ±5 V-DC.
3
NOTE: When the 10A74-4C is used with four 350-Ω full-bridge transducers at 10 V-DC excita-
tion, a special modification of the card is required to provide proper current for excitation of
each bridge. Also, no more than 16 Model 10A74-4C cards using this excitation/configuration
combination for all four channels can be installed in any one System 10 “A-card” rack.
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10A74-4C |
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