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The K800 calibration unit for strain gauge quarter bridges launched by HBM can calibrate eight channels simultaneously. The device is particularly useful for multi-channel measuring amplifiers, such as HBM’s MGCplus, that must be calibrated regularly to ensure accuracy. Multi-channel amplifiers are used for complex measurement applications needing higher channel counts, such as in applications ranging from vehicle road tests through to experimental stress analysis using single strain gauges in the aerospace industry.

The K800 comes with five calibration steps for amplifier imbalances of between ±8 mV/V. The steps are individually balanced for each of the eight channels providing a precision resistor network to achieve high accuracy. The unit is fitted with LEDs on the front panel to show the device status at any time.

The calibration unit is an intuitive and easy to operate device that gives faster calibration than sequential calibration of measurement channels. Four versions of the device – 120 ohm, 350 ohm, 700 ohm and 1000 ohm – are available to meet the needs of the most popular nominal strain gauge resistances.

The K800 can be operated either by a PC connected using the USB port, or with a digital input. Adjustment of the calibration steps and the data acquisition can be made either manually or by using the PC running a controlling program. Checks on the calibration can be made quickly and easily. An advantage of using the USB port is that cable snarls are reduced because no power supply pack is needed. A standard power supply pack is needed when the digital control input is used. The unit is designed with stackable metal housings allowing a number of different calibration units to be put on top of each other to save space. Each K800 is supplied with a DKD (German Calibration Service) certificate to ensure traceability of measurements to national standards.

Cables that allow for either 3- or 4-wire circuits are supplied with the K800 to connect the device directly to HBM’s AP814 and AP815 quarter bridge amplifiers. These are used in conjunction with the ML801 basic measurement module.

Key Features

• Quarter-bridge simulations (for calibrating the AP814 and AP815 of the MGCplus system)
• Parallel control of all eight calibration signals
• Four versions: 120 Ohm, 350 Ohm, 700 Ohm or 1000 Ohm calibration resistance
• Computer control or manual operation
• Status display via LEDs