Universal, ac Carrier Strain Gage Signal Conditioners
Model #701
These instruments are full featured strain gage conditioner/readouts; the Model 701 handles one and the Model 711 handles two transducers. Both provide fast, accurate data for each channel. What's more, 18 of the most useful processing functions and 26 real-time digital calculations are built in. Their use converts the Model 701/711 into powerful production and performance test analyzers with easily configured characteristics. A two line alphanumeric display publishes measured and computed data, units of measure and test status. Transducer calibration is automatic, requiring no manual adjustments.
Instrument Specifications
ACUA (Model 1) Universal Strain Gage Amplifier | |
Strain Gage Input
| Any 80Ω to 2kΩ transducer, directly wired or transformer coupled. 4, 6, or 7 wire circuits are accommodated. |
Transducer Excitation | 3Vrms, 3030Hz ±0.01% sine wave. Regulated, and short circuit protected. |
Input Sensitivity | 0.5 to 5mV/V with 50% overrange; automatically scaled. |
Input Impedance | 100MΩ in parallel with 33pF. |
| Maximum Cable Length | 500 feet for transducer impedance >100Ω and 200 feet for transducer impedance < 100Ω |
Automatic Null Range | In-Phase Signals: ±10% of Full Scale (with 50% overrange), 60% of Full Scale (with 0% overrange). Quadrature Signals: ±1mV/V. |
Auto Calibration | Dual polarity shunt calibration with provision for CAL resistor feedback. |
Spurious Signal Rejection | 60Hz: 120dB common mode, 100dB normal mode. Carrier quadrature: 60dB. |
Antialias Filter | 200Hz, 7 pole Bessel response filter. |
Low Pass Filtering
| 4 pole Bessel response digital filter with 11 cutoff frequencies from 0.1 to 200Hz in 1-2-5 steps. |
Signal-to-Noise Ratio1 | @ 1mV/V F.S.: 86/76/66/62dB with 1/10/100/200Hz filters @ 5mV/V F.S.: 86/80/72/66dB with 1/10/100/200Hz filters |
Resolution | 0.01% of F.S. |
Overall Accuracy (at 77°F/25°C) | 0.02% of F.S., worst case. |
Temperature Effects | Zero: ±0.001% of F.S./ °F (max); Span: ±0.001% of F.S./ °F (max). |
General System Specifications | |
| System Display | 2 line by 16 alphanumeric characters, each 0.2" wide by 0.3" high. Backlit LCD with adjustable contrast. |
| Views: | Select either 2 Channels, 1 Channel with Limit Status, or 1 Channel with I/O Status. |
| Data Displayed | Select from Current, Max, Min, Spread, Held data and Tare value. |
| Data Format | Engineering units with 6 digits (1-2-5 format) and 5 character, upper or lower case, user-entered legend/descriptor. |
| System Response (per channel) | Data Sampling & Max/Min Update Rates: 2000Hz (hardware channels), 50Hz (CH3 calculation). Limit Checking Rate: 1000Hz (hardware channels), 50Hz (CH3 calculation). Logic I/O Response Time: 1ms (hardware channels), 20ms (CH3 calculation). Update Rate for Each Analog Output: 1000Hz. |
| System Control | All I/O functions can be OR’d in any combination. The pattern function adds ANDing capabilities. |
| Input Actions/Channel | Logic inputs, outputs, and internal Matrix signals control following actions. Tare, Clear Tare, Hold, Clear Hold, Reset Max/Min, Clear Latched Limits, Check Limits, Do Max/Mins, Apply +CAL, Apply -CAL. |
| Output Events/Channel | The following events drive Logic outputs and internal Matrix signals. HI Limit, NOT HI Limit, IN Limit, NOT IN Limit, LO Limit, NOT LO Limit, At Max, NOT At Max, At Min, NOT At Min. |
| Three User-defined Patterns | Patterns of Logic inputs, outputs and Matrix signals drive Logic outputs and internal Matrix signals. |
| Limit Checking | Each channel has a HI and LO limit which may be latched or unlatched, absolute or signed, and with or without hysteresis. Select either Current, Max, Min, Spread or Held data for limit checking. Limit violations on any or all channels can be set to trigger backlight flashing in any of the display view modes. |
| Four Logic Inputs | Each with programmable destination, protected to ±130VDC or 130Vrms. |
| Type | TTL compatible, Schmitt Trigger, low-true with 47kΩ pull-up. Input current is -100μA @ 0V. |
| Six Logic Outputs | Each with programmable source, short circuit (current and thermal limits) and overvoltage (fuse) protected. |
| Type | Open collector, low-true. Operating @ 24V (max) and 0.3A max sink current. |
| External +5VDC Power (on I/O connector) | 250mA, short circuit (current limit) and overvoltage (fuse) protected. |
| Serial Communication Port | (selectable as RS232, RS422, or RS485. Supports 32 devices on RS485 port and 1 device on RS232/422) |
| BAUD Rate | 300 to 38400. Maximum Cable Length: 4000ft (RS422/RS485), 50ft (RS232). |
| 120Ω Termination Resistors (RS485) | user selectable for RXD and TXD. |
| RS422/485 Transceivers | Slew-rate limited, short circuit protected (current & thermal limits). |
| RS232 Drivers | Short circuit protected (current limit). |
| Serial I/O’s | Use a 9 pin D connector. They are ±15kV ESD protected and float (100kΩ) with respect to Earth Ground. |
| Size and Weight | 6.5" wide, 2.9" high, 8.7" deep. Weight is 3 pounds. |
| Operating Temperature | +41°F to +122°F (+5°C to +50°C). |
| Input Power | 90VAC to 250VAC, 50/60Hz @ 25VA, max. Two 2A/250V fuses, line filter, and rear power switch. Option 12D1 converts from AC line power to 10 to 15VDC operation @ 15 Watts, max. It includes a rear power switch, fuse & filter. |
| Notes: | 1. The ratio expressed in decibels (dB), of Full Scale to noise spread. Measurements are made for a 1 minute interval using a 350Ω bridge. 2. Specification is subject to change without notice |