Daytronic 10A78 Bedienungsanleitung
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10A78
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Model 10A78 is a single-channel conditioner of phase-sensitive carrier-amplifier
design (rather than a two-channel, fully DC instrument). Intended for applications
involving transformer-coupling to the transducer bridge (as with rotary-transformer
torque sensors), this conditioner can also be used in conventional installations when
high sensitivity is required or where the electrical environment is especially noisy.
Responding only to the modulated carrier frequency, the 10A78 rejects extraneous
voltages that can cause errors in DC systems, particularly when there is a need to
“blow up” a portion of the transducer range. User-adjustable phase and symmetry
controls are provided.
The Model 10A78's data channel is best calibrated by means of a “two-point (dead-
weight)” or shunt-calibration technique, following an initial “calculated” calibration. The
supplied calibration resistor is 59 kilohms, 1%. Note that the 10A78 can NOT be cali-
brated via the System 10
MV/V CALIBRATION (MVV) command. Note also that a
specially modified version of the 10A78 is required if you wish to control the shunt-cali-
bration process by means of logic-level inputs through the rear I/O CONNECTOR.
ADDITIONAL 10A78 SPECIFICATIONS
Transducer Types
: Conventional 4-arm strain gage bridges, nominal 350 ohms (or
higher)
Input Ranges (Full-Scale): ±0.75, 1.50, or 3.00 mV/V; automatically selected—on an
individual channel basis—when the channel is configured; for the System 10 channel
“type” code assigned to a 10A78 data channel, see Table 1, below. Since channel
zeroing is by digital techniques, no input balance control is provided. The allowable
input range, therefore, must include any
initial unbalance (which, in commercially
produced strain gage transducers, is usually negligible). Other transducers may
have to be externally trimmed to be used with the Model 10A78, if zero unbalance
exceeds 20% of full scale.
Excitation: Regulated 3 V-AC (rms) at 3280 Hz; 50 mA (rms), maximum
Amplifier:
Common-Mode Range: ±1 V operating; ±9 V without instrument damage
Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 3 kHz: -60 dB
Input Impedance (Differential and Common-Mode): 10 MΩ
Offset: Initial: ±3% of full scale; vs. Temperature: ±0.005% f.s./°C; vs. Time: ±0.02%
f.s./month
Gain Accuracy*: ±0.02% of full scale typical, following calibration
(cont’d)
MODEL 10A78
AC STRAIN GAGE
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A78.1
* Initial (uncalibrated) inaccuracy may be as great as ±3% of full scale. Maximum error that
could occur upon replacement of a Model 10A78 not followed by calibration is ±6% of full
scale.
1.E.2.10A78
SYSTEM 10
ANALOG INPUT CARDS
Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
Filter: 3-pole modified Butterworth; 3 dB down at 7.5 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: 350 msec
To 0.02% of final value: 500 msec
Auxiliary Output: Filtered output available on mainframe wire-wrap pin
Table 1 10A78 “Type” Codes
Full-Scale Channel
Input Type Code
0.75 mV/V 70
1.50 mV/V 71
3.00 mV/V 72
2 TRANSDUCER CONNECTIONS
The Model 10A78’s I/O CONNECTOR mates with Daytronic CONDITIONER CONNEC-
TOR No. 60322, shown in Fig. 1.5 (in Manual Section 1.E.1). Table 2 gives standard pin
assignments for the I/O Connector. With regard to 10A78 cabling, please note the fol-
lowing:
a. 4-wire strain gage cabling is given in Fig. 1(a), and 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 (and also the CALIBRATION SENSE line to the
+SIGNAL line)
at the CONDITIONER CONNECTOR. It is recommended that the
resistance of the conductors not exceed 0.0001 of the bridge resistance.
b. 8-wire strain gage cabling is given in Fig. 1(b), and is to be used when the cable is
20 feet or longer, or when fine wire is used.* In this case, the +SENSE and
–SENSE lines are tied to the corresponding EXCITATION lines (and also the CALI-
BRATION SENSE line to the +SIGNAL line)
at the transducer. Note also the wire
connected to the –SIGNAL line, at the transducer, but left
unconnected at the
10A78. This wire is to be paired with the CAL SENSE line for shielding purposes.
NOTE: The special 8-wire cabling shown in Fig. 1(c) is required for connecting a
Model 10A78 to a
Lebow 1600 Series Transducer. The cable should be shielded in
four pairs, as shown, with the shield open at the transducer end. In the case of con-
nection to a Lebow 1600 Series Transducer, also note that
a. SENSE and EXCITATION lines should be tied
at the transducer.
b. The 10A78’s
Pin 5 (“LEBOW CAL”) is to be connected to the “CAL” pin on the
Lebow sensor (Pin 4 is not used in this case).
c. Leave the last (extra) wire unconnected at both ends, and pair it with the “LEBOW
CAL” line for the fourth shield.
d. THE MODEL 10A78 MUST BE INTERNALLY SET TO “SIGNAL COMMON” MODE,
via the following procedure:
10A78.2 TRANSDUCER CONNECTIONS
* This cabling is to be used when connecting a Model 10A78 to a Lebow 1800 Series Trans-
ducer.
10A78 AC STRAIN GAGE CARD
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10A78 |
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