Analog Output: Range scalable in 0.1% increments between 74.5% and 125.5% of
nominal input.* May be sourced by conditioned input (A) after the FIXED ANA-
LOG FILTER; (B) after PEAK CAPTURE; or (C) after the SELECTABLE ANALOG FIL-
TER (see Fig. 15, Section 2.d)
Frequency Characteristics and Step-Response Settling Times:
AFTER THE FIXED ANALOG FILTER or AFTER +PEAK IN "TRACK" MODE:
3 dB down at 2 KHz; 60 dB down at 16 kHz. Settling Time to 1% of final value:
0.6 msec; to 0.1% of final value: 0.75 msec; to 0.02% of final value: 1.25 msec
AFTER +PEAK IN "PEAK" MODE: Settling Time to 1% of final value: 6 msec; to
0.1% of final value: 12 msec; to 0.02% of final value: 20 msec
AFTER THE SELECTABLE ANALOG FILTER: See "Analog Filtering for Dis-
played Reading" for the Model 3570, above
Configuration, Full-Scale Range, Offset Range Adjustment, Allowable
Loading, Offset Accuracy, Span Accuracy, Offset and Span Drift: See the
Model 3530 LVDT Conditioner, above
A.2.f MODEL 3578 AC STRAIN GAGE CONDITIONER
Transducer Types and Ranges: Conventional 4-arm strain gage bridge, nominal
90 Ω or higher, with a full-scale range of 0.75, 1.50, or 3.00 mV/V. 1/4-, 1/2-, or full-
bridge gage configurations can be accommodated by appropriate external
bridge-completion circuitry supplied by the user. Since channel zeroing is by dig-
ital 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 negligible). Other transducers may have to be exter-
nally trimmed to be used with the instrument, if zero unbalance exceeds 20% of
full scale.
Actual Absolute Input at which
Normal-Mode Maximum Display Reading
Nominal Input-Signal Overrange Corresponds
Input Range Voltage (Max) (33%) to "m" Term
3.00 mV/V 13.5 mV 4.0 mV/V 4.0 mV/V
1.50 mV/V 6.75 mV 2.0 mV/V 2.0 mV/V
0.75 mV/V 3.375 mV 1.0 mV/V 1.0 mV/V
AC Excitation: Regulated 3 V-AC (rms) at 3280 Hz; 50 mA (rms), maximum
Amplifier: AC-coupled demodulator with user-settable phase and symmetry con-
trols
Normal-Mode Range: ±12 mV rms, operating; ±8 V-DC without instrument dam-
age
Common-Mode Range: ±0.8 V-DC operating, ±8 V-DC without instrument damage
Common-Mode Rejection Ratio: infinite at DC; -90 dB at 60 Hz; -80 dB at 1 kHz;
-60 dB at 3 kHz
Input Impedance (Differential and Common-Mode): 10 MΩ
Offset: Initial: ±3% of full scale; vs. Temperature: ±0.005% f.s./°C; vs. Time: ±0.002%
f.s./month
A.7
3500 SERIES SPECIFICATIONS
A
A.2 INDIVIDUAL CONDITIONER SPECIFICATIONS: MODEL 3578
* When (1) the analog output scale is 100.0%, (2) the analog output offset is 0.0%, and (3) the
excitation is 10V, then any of the following inputs will result in an analog output of 5 V: an input
of 4 mV/V on the 3.0-mV/V range; an input of 2 mV/V on the 1.5-mV/V range; or an input of 1
mV/V on the 0.75-mV/V range.
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