MODEL 214 STRAIN GAGE BRIDGE CALIBRATOR
Description
The Model 214 provides AC calibration to a strain gage bridge by switching a parallel resistor across any leg of the bridge at the selected frequency. The desired resistance is selected using the front panel thumbwheel. The Model 214 has a range of 0 to 9.999 Mega-ohms selectable in steps of 1K ohm. The front panel LED functions as a power indicator and low battery indicator. If the battery voltage falls below 15.0 volts the front panel LED will go out indicating the need to change batteries. The batteries are located in the easy access rear panel compartment for quick replacement.
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Specifications
| Bridge: | 120 ohm to 1K ohm |
| Bridge excitation: | 0.5V to 10V, +P to – P |
| Frequency: | Switch selectable at 10, 20, 50, 100, 200, 500, 1kHz |
| CAL resistor: | Adjustable from zero ohms to 9.999 Megohms in 1K ohm steps with ± 1% accuracy |
| Output: | FET switch closure in series with CAL resistor |
| Indicators: | Combined front panel Power On/Low Battery |
| Power: | Operates on two 9V batteries, Eveready #505 or equivalent; eight-hour continuous operation |
| Operating temperature: | -25° to 140°F |
| Rear panel connectors: | Monitor banana jacks; output BNC |
| Mechanical: | High impact plastic instrument case 4.5”W x 8.75”D x 3.5”H |