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7
Calibration
Your DDA-06 board is initially calibrated at the factory. You are advised
to check the calibration of a board after setting a new range and
periodically thereafter. For laboratory environments, a 6-month to 1-year
calibration interval is recommended. For extremes of temperature,
vibration, and humidity, a 3-month calibration interval is recommended.
In any case, the long-term zero drift is not likely to exceed ±1 mV, and
gain drift is not likely to exceed ±0.1%.
If you are unable to adjust a DAC to correct settings or the DAC exhibits
nonlinearity, you must replace the DAC. The DACs are plug-in DAC-80N
or DAC-80Z units (Keithley MetraByte part number DAC-12).
This chapter provides the information you need to calibrate a DDA-06
board.
Equipment Requirements
The equipment requirements for calibrating a DDA-06 board are as
follows:
●
A digital voltmeter accurate to 6 1/2 digits, such as a Keithley
Instruments Model 199
●
An STA-U accessory with C-1800 cable, an STC-37 accessory, or a
user-designed interface
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