DESCRIPTION
The auto industry standard for on-board vehicle test, the Model 428 is small and rugged but is able to condition and amplify the signals from almost any bridge type transducer including strain gages, load cells, and RTDs. On the test tracks, the Model 428 can produce high accuracy data despite temperature extremes and high shock and vibration conditions. RFI/EMI protection is available to minimize the effects of the many spurious signals from today’s on-board electronics or even telemetry transmitters. Models with compatible enclosures are available for crash test and other extreme applications.
The Model 428 is a true differential amplifier with transformer isolation between input, output and the power source. An internal dc/dc converter provides bi-polar voltages for the circuitry while accepting power from a single external dc power supply or battery. This is 12 volts for automotive applications or 28 volts for airborne systems. In addition to the high performance dc amplifier, the units can be optionally supplied with integral strain gage excitation supplies and bridge balance or zero suppression. Transformer coupling contributes to high common mode rejection and the chopper design results in superior zero stability. The use of top grade components and a rigorous testing program ensures reliable operation over a wide range of ambient temperatures.
The Model 428 amplifier is packaged in a rugged, compact steel case and will withstand high shock and vibration levels under fully operational conditions. The Model 428 is intended for rack mounting and is equipped with a front panel gain switch. Zero controls are also located on the front panel in accordance with the options selected. The front panel dimensions are 1.1” by 2.37” and the depth is 4” (plus connector and controls). The R408 Series enclosures are 3.5” high and optionally contain 115 V ac power supplies. A full one year warranty applies when the equipment is used under any environmental conditions within its rating.
400 SERIES ENCLOSURES
Ectron 400 Series enclosures provide connector interface for power and signal input and output connections for 400 Series products. Portable, bench mount, rack mount, and signal-conditioning systems are available with capacities from 6 to 22 conditioners. The following Ectron products are interchangeable in these enclosures: the Models 352 and 428 conditioner amplifiers, the Model 441A/AL frequency-to-voltage converter, and the Model 451 LVDT/RVDT signal conditioner. Thermocouple conditioning can be added using the 200 Series T/C Mate.
FEATURES
- Dual Gain Ranges
- 100 g Shock, 20 g Continuous Vibration
- –55°C to +100°C Operation
- 90% Relative Humidity
- Thermal Shock Resistant
- <0.5 µV/°C Stability
- True Differential Amplifier
- Zero Suppression
- EMI Protected
- Autozero
- Small size ~1″ x 2″ x 4″
OPTIONS
- Option B: changes the amplifier output capability from ±10 volts to a limited 0 to +5 volt output.
- Option G: changes the dual gain-step ranges to binary.
- Option L: adds latched front-panel LED indication of output overvoltage with a front-panel reset switch.
- Option O: adds autozero with front-panel manual control and remote control capability.
