38
Operation & Calibration
3.1.8
Isolation
The USB-61210 provides 500VDC isolation capability to protect against
hazardous voltage caused by erroneous signal connection or signal lev
-
els to be measured exceeding expectation. The isolation circuit can also
reduce the ground-loop noise.
Figure 3-25: Isolation
3.2 Calibration
3.2.1
Loading Calibration Constants
The USB-61210 is factory-calibrated before shipment. The associated
calibration constants of the TrimDACs firmware are written to the
onboard EEPROM. TrimDACs firmware is the algorithm in the FPGA.
cnt
length
Pulse
cnt
initial
Pulse
cnt
length
Pulse
Duty
cnt
length
Pulse
cnt
initial
Pulse
F
F
PWM
Tim ebase
PWM
_
_
_
_
_
_
_
_
_
_
+
=
+
=
Summary of Contents for USB-61210
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Page 10: ...x List of Tables This page intentionally left blank...
Page 15: ...Introduction 5 Figure 1 2 USB 61210 Module Side View...
Page 16: ...6 Introduction Figure 1 3 USB 61210 Module Front View...
Page 19: ...Introduction 9 Figure 1 7 Module Stand Top View 20 4 20 4 B 26...
Page 50: ...40 Operation Calibration...
Page 56: ...46 Getting Service...
