ADLINK USB-1210 - Manual (Page 49)

Operation & Calibration 39
USB-1210
3.1.8 Isolation
The USB-1210 provides 500VDC isolation capability to protect
against hazardous voltage caused by erroneous signal connection
or signal levels to be measured exceeding expectation. The isola-
tion circuit can also reduce the ground-loop noise.
Figure 3-25: Isolation
3.2 Calibration
3.2.1 Loading Calibration Constants
The USB-1210 is factory-calibrated before shipment. The associ-
ated calibration constants of the TrimDACs firmware are written to
the onboard EEPROM. TrimDACs firmware is the algorithm in the
cnt length Pulse cnt initial Pulse
cnt length Pulse
Duty
cnt length Pulse cnt initial Pulse
F
F
PWM
Tim ebase
PWM
_ _ _ _
_ _
_ _ _ _
+
=
+
=
FPGA
USB Interface
USB BUS
+5V
Supply
USB
Controller
Power
Isolation
Power
Isolator
CPLD
DDR3
ADC
DIO
USB-1210