Daytronic 10A31-4 Bedienungsanleitung
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10A31-4
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Model 10A31-4 is for measurement of displacement, force, pressure, and other
parameters obtained with a
variable reluctance transducer or linear variable dif-
ferential transformer (LVDT)
. Based on the synchronous carrier-demodulator prin-
ciple, it supplies regulated, remotely sensed AC excitation for four independent
transducer channels. It then demodulates, filters, and amplifies the resulting signals to
produce system outputs precisely proportional to LVDT core displacement. The
10A31-4 automatically adjusts to the signal phase shift of the transducer in use, there-
by insuring optimum sensitivity and linearity. Special input provisions exist for “long-
stroke” LVDT's (full-scale range of ±1 inch or greater).
For each of its four analog inputs, the 10A31-4 produces two displayable outputs: one
with “normal” analog filtering and one with
high bandwidth characteristics (see Speci-
fications and Table 1, below). All four channels share a common sensed excitation of
100 mA (rms), maximum. As explained in Section 2, for cables over 25 feet in length,
this limits the distance from the sense point to the transducer to about 20 feet of 18-
gage wire.
The 10A31-4's eight SUBCHANNELS are assigned as follows:
Table 1 Model 10A31-4 Subchannels
Subchannel No. Function
1 Input No. 1, low-bandwidth filter
2 Input No. 2, low-bandwidth filter
3 Input No. 3, low-bandwidth filter
4 Input No. 4, low-bandwidth filter
5 Input No. 1, high-bandwidth filter
6 Input No. 2, high-bandwidth filter
7 Input No. 3, high-bandwidth filter
8 Input No. 4, high-bandwidth filter
ADDITIONAL 10A31-4 SPECIFICATIONS
Transducer Types
: 5- or 7-wire LVDT's capable of 3280-Hz operation and having pri-
mary impedance of 80 ohms or greater (all Daytronic LVDT transducers are suit-
able); 3- or 5-wire variable reluctance transducers
Sensitivity Range: Accommodates full-scale ranges from ±0.010 in. (±0.25 mm) to
±6.0 in. (±15.24 cm), when used with Daytronic or equivalent transducers; for System
10 channel “type” codes assigned to 10A31-4 data channels, see Table 2, below
Standard Input (rms, full-scale): 78, 156, or 312 mV/V
Long-Stroke Input (rms, full-scale): 525 mV/V, 1.05 V/V, or 2.10 V/V
(cont’d)
MODEL 10A31-4
QUAD LVDT
C
ONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A31-4.1
SYSTEM 10
ANALOG INPUT CARDS
1.E.2.10A31-4
Excitation (per channel): Nominal 3.0 V-AC (rms) at 3280 Hz; 40 mA (rms), maximum
Amplifier (per channel):
Common-Mode Range: ±5 V operating; ±12 V without instrument damage
Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 3 kHz: -60 dB
Input Impedance: Differential: 400 kΩ; Common-Mode: 100 kΩ
Offset: Initial: ±3% of full scale; vs. Temperature: ±20 ppm/°C; vs. Time: ±0.01%
f.s./month
Gain Accuracy: ±0.02% of full scale typical, following calibration*
Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
Filter (per channel):
NORMAL: 3-pole modified Butterworth; 3 dB down at 6 Hz; 60 dB down at 60 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 250 msec
To 0.1% of final value: 400 msec
To 0.02% of final value: 500 msec
HIGH BANDWIDTH: 3-pole modified Butterworth; 3 dB down at 200 Hz; 60 dB down
at 2750 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 5 msec
To 0.1% of final value: 8 msec
To 0.02% of final value: 13 msec
Auxiliary Outputs: Filtered outputs available on mainframe wire-wrap pins
Table 2 10A31-4 “Type” Codes
Full-Scale Channel
Input (RMS) Type Code
78 mV/V 64
156 mV/V 63
312 mV/V 65**
525 mV/V 64
1.05 V/V 63
2.10 V/V 65**
2 TRANSDUCER CONNECTIONS
The Model 10A31-4’s I/O CONNECTOR mates with Daytronic CONDITIONER CON-
NECTOR No. 60322, shown in Fig. 1.5 (in Manual Section 1.E.1). Table 3 gives stan-
dard pin assignments for the I/O Connector. With regard to 10A31-4 cabling, please
note the following:
a. All four 10A31-4 input channels use a single, sensed excitation supply.
b. 5-wire LVDT cabling (Fig. 1(a)) or 3-wire variable reluctance transducer cabling
(Fig. 1(c)) is to be used when the cable is under 20 feet in length. In this case, the
+SENSE and –SENSE lines are tied to the corresponding EXCITATION lines
at the
CONDITIONER CONNECTOR.
10A31-4.2 TRANSDUCER CONNECTIONS
* Initial (uncalibrated) inaccuracy may be as great as ±3% of full scale. Maximum error that
could occur upon replacement of a Model 10A31-4 not followed by calibration is ±6% of full
scale.
** Equivalent to TYPE “30” for a 10A31-4 channel.
10A31-4 QUAD LVDT CARD
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10A31-4 |
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