The problem is that if you increase the time base setting past 100ms/div, then for some reason the Record menu item (under the Utility/Record menu) is greyed out as OFF and cannot be changed to ON. If the time base is 100ms/div or less, then it is enabled and can be changed to ON.
This is why:
- When time base is in range 0.2s to 50s, the scope enters in "Slow Sweep" mode.
- "Slow Sweep" ~ "Roll Mode"
- In "Roll Mode", the "Waveform Record" is not available.
Please read the whole User Guide, or search inside the PDF:
page 11-1
Note: The horizontal time base must be set to Y-T mode during waveform record.
page 3-5
Roll Mode
In this mode, the waveform scrolls from right to left to update the display. The horizontal position and trigger control of the waveform are not available. The range of horizontal scale adjustment is from 200 ms to 50.0 s.
Note: When Roll mode is enabled, the waveform "horizontal position", "Delayed Sweep", "Protocol Decoding", "Pass/Fail Test", "Waveform Record", "To Set the Persistence Time" and "To Trigger the Oscilloscope" are not available.
Slow Sweep
Slow sweep is similar to Roll mode. In YT mode, when the horizontal time base is set to 200 ms/div or slower, the instrument enters "slow sweep" mode in which the instrument first acquires the data at the left of the trigger point and then waits for a trigger event. After the trigger occurs, the instrument continues to finish the waveform at the right of the trigger point. When slow sweep mode is used to observe low frequency signal, DC "Channel Coupling" mode is recommended."
Anyway, the "Waveform Record" does not record continuously, like a sound card. "Waveform Record" captures data seen on the display, like in a movie. But between 2 consecutive waveforms displayied, there is a small pause in data, while the scope is searching for a new trigger point.
The "Waveform Record" function is meant to replay the screens one by one, like in a movie played frame by frame. "Waveform Record" does not acquire data continuously, like a data acquisition card.
To record 10s continuously, the best method is what
metrologist said.