The Model 414 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 (tare). 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 amplifiers are packaged in rugged, compact steel cases and will withstand high shock and vibration levels under fully operational conditions. The steel case is 1.1″ by 2″ by 3″ or 4″ depending on options, with stud mounting bolts. On special order, flange mounting may be substituted. All adjustment potentiometers are installed on one end, and a DAM-15 input/output connector is on the opposite end.
Four fixed gain steps are provided which are selected by jumpers in the input/output connector or by a front panel switch depending on options. These, combined with the gain vernier, allow any gain between 20 and 1000 to be set. A full one year warranty applies when the equipment is used under any environmental condition within its rating.
- 100 g Shock, 20 g Vibration
- Excellent Stability Under Large, Fast Temperature Changes
- Ohmically Isolated Input and Output
- 12 V dc or 28 V dc Powered
- True Differential Input
- High Common Mode Rejection