DayTronic System 10, User Manual Book

Page: 328 / 414

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
T
RANSDUCER
C
ONNECTIONS
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
T
RANSDUCER
C
ONNECTIONS
* This cabling is to be used when connecting a Model 10A78 to a Lebow 1800 Series Trans-
ducer .
10A78
AC S
TRAIN
G
AGE
C
ARD