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 3560, 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.e MODEL 3570 DC STRAIN GAGE CONDITIONER
Transducer Types and Ranges: Conventional 4-arm strain gage bridge, nominal
120 Ω or higher, with a full-scale range of 0.75, 1.5, or 3.0 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) (50%) to "m" Term
3.0 mV/V 45 mV 4.5 mV/V 4.0 mV/V
1.5 mV/V 22.5 mV 2.25 mV/V 2.0 mV/V
0.75 mV/V 11.25 mV 1.125 mV/V 1.0 mV/V
DC Excitation: User-selectable 10 V (±5 V), 5 V (±2.5 V), or 2 V (±1 V), 85 mA maxi-
mum
Normal-Mode Range: ±45 V operating, ±8 V without instrument damage
Common-Mode Range: ±0.50 V operating, ±8 V without instrument damage
Common-Mode Rejection Ratio: -60 dB at DC; -90 dB at 60 Hz, 1 kHz, and 3 kHz
Input Impedance (Differential and Common-Mode): Greater than 100 MΩ
Offset: Initial: ±0.025% of full scale; vs. Temperature: ±25 ppm/°C; vs. Time: ±10
ppm/month
Gain Accuracy*: ±0.02% of full scale ± 1 count LSD, typical, following calibration
Gain Stability: Vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
Analog Filtering for Displayed Reading: See the Model 3530 LVDT Conditioner,
above
Analog Peak Capture: See the Model 3560 Voltage Conditioner, above
Internal 15-Segment Linearization, programmable from front panel
A.6
A
3500 SERIES SPECIFICATIONS
A.2 INDIVIDUAL CONDITIONER SPECIFICATIONS: MODEL 3570
* Initial (uncalibrated) inaccuracy may be as great as ±0.05% of full scale. Maximum error that
could occur upon replacement of the 3570 not followed by calibration is ±0.1% of full scale.
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