6-1
6
Calibration
The analog input circuitry of DAS-800 Series boards is calibrated in the
factory. It is recommended that you check the calibration every six
months and recalibrate the board, if necessary.
Note:
For channels using gains other than 1, the board maintains the
initial calibration within an accuracy of ±0.05%. In applications where a
single gain (other than 1) is used for all channels, you can achieve better
accuracy by calibrating the board at the selected gain.
The following sections provide the information you need to calibrate
DAS-800 Series boards.
Equipment Required
To calibrate a DAS-800 Series board, you need either:
●
A digital voltmeter accurate to 6 1/2 digits on its ±10 Vdc range, such
as the Keithley Model 2000, and a stable DC supply capable of
providing ± 10Vdc, or:
●
A calibrated DC voltage source with an output voltage range
of ±10 V, with sufficient accuracy and resolution that using a meter to
check the applied voltage is not necessary.
Note:
If a calibrated DC voltage source is not available, use a
variable DC voltage source and set its output voltage level using
the voltmeter. (Measure betwen TP1 - TP2 on DAS-801 and
DAS-802.