VT DSO-2A20 Manual Rev. 1.1
Virtins Technology
1.8.10 Calibration and Re-Calibration
All the second-generation VT DSOs are individually calibrated to the specifications. Some
models allow the user to re-calibrate them. To do the re-calibration, go to
[Setting]>[Calibration]> “Advanced”. The following “Advanced Calibration” dialog will
pop up.
You can calibrate the offset and gain settings for each voltage measuring range and for each
channel. The following are the steps to calibrate Channel A at
±
1V.
(1)
Write down the current Offset, Gain (linear) and Gain (dB) values. This is important for
system restoration in case all the settings are messed up.
(2)
Put Channel A to DC,
±
1V, 16Bits, 1MHz (or lower, 100kHz recommended).
(3)
Short the probe tip to its ground lead.
(4)
Adjust the Offset spin box in the Advanced Calibration dialog such that the mean value
of Channel A is zero.
(5)
Inject a DC or low-frequency signal with known amplitude to channel A. For better
accuracy, the amplitude should approach the limit of the voltage measuring range to be
calibrated. For the calibration of some voltage measuring ranges, you may use the DSO’s
signal generator to generate the test signal.
(6)
Adjust the Gain or Gain (dB) spin box in the Advanced Calibration dialog such that the
maximum/minimum value (when the test signal is AC) or mean value (when the test
signal is DC) of Channel A is equal to the amplitude of the test signal.
(7)
Click the Write button in the Advanced Calibration dialog to save the changed settings
into the DSO hardware. Note that if you click the Read button before you click the Write
button, the changed settings will be overwritten by the settings previously stored in the
DSO hardware.
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