Measurement Computing USB-1608HS - Manual (Page 12)

USB-1608HS User's Guide Installing the USB-1608HS
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If the ACT LED turns off
If the ACT (active) LED lights up but then turns off, the computer has lost communication with the USB-
1608HS. To restore communication, disconnect the USB cable from the computer, and then reconnect it. This
should restore communication, and the LED should light up again.
Calibrating the USB-1608HS
The USB-1608HS is shipped fully-calibrated. Calibration coefficients are stored in EEPROM.
You can calibrate the analog inputs on the USB-1608HS with InstaCal. The normal calibration interval is once
per year.
Calibrate the device whenever the USB-1608HS's ambient temperature changes by more than ±10 °C. Allow
the USB-1608HS to warm up for at least 30 minutes before starting the calibration.