Please provide the SCPI command to set the time base scale of an oscilloscope to 10 microseconds/division using the following prompt:

1. Write the SCPI command using delimiters to indicate the specific parts of the input required. 
2. Format your response as a JSON value with a "natural_language" key and corresponding SCPI command value.
3. To successfully complete the task, ensure that the SCPI command sets the time base (horizontal) scale to 10 microseconds per division. 
4. To clarify the task, an example of setting the vertical scale for channel 1 to 500 mV/division has been provided.
5. Please specify the steps required to complete the task, and work out a solution before finding one.