User`s manual

4-20
IM 701610-01E
Explanation
Calibration
The following parameters can be calibrated. Perform calibration when highly accurate
measurements are required.
• Ground level offset
• A/D converter gain
• Trigger threshold
• Time axis for repetitive sampling mode
Points for Attention
• Always allow the instrument to warm up for at least 30 minutes after the power is
turned ON before starting calibration. If calibration is performed immediately after the
power is turned ON, the calibration may be inaccurate due to drift caused by
fluctuation in the temperature of the instrument.
• Calibration must be performed when the temperature of the instrument is stable and is
between 5°C and 40°C (preferably at 23°C ±5°C).
• When performing calibration, remove the input signals. Otherwise, proper calibration
may not result.
Note
• The above calibration is performed automatically when power is turned ON.
• If the V/div knob has been turned, perform calibration for all parameters except the time axis
for repetitive sampling mode.
Auto Calibration (Auto Cal)
Calibration is performed automatically after the times shown below elapse after turning
ON the power, when the T/div setting is changed, or when waveform acquisition is
started.
• After 3 minutes
• After 10 minutes
• After 30 minutes
• After one hour and every hour thereafter
If the DL1620/DL1640/DL1640L is auto-calibrated while input takes place, it is
recommended that you disconnect the input and then repeat calibration.
Deskew
Corrects the CH1 to CH4 (or CH1 and CH2 for the DL1620) delays.
Deskew Time Setting Range
The correction time is set within the following range.
–100 ns to 100 ns
4.7 Calibration