2461 SourceMeter pulse train clipping at 36 V short of 105 V spec

I am trying to set up a test where I am looking for short low current voltage pulses out of the 2461 SourceMeter. To verify the test pulse out of the unit, I have tried to measure the pulse train by connecting the oscilloscope directly to the output of the 2461 (FORCE HI/LO) and through a 1 Mohm resistor. As I increase the voltage set point of the pulse train, the output begins to clip at ~36 V, far short of the target/spec of 105 V. Is there an obvious reason why the output may be clipping at 36 V? I have tried different combinations of pulse widths and duty cycles that all resulted at the same clipping point.

What is the state of interlock?
If interlock not satisfied, the max voltage is clipped/only a portion of 100V range can be used.

I see. I missed that part. You're right --  I need to design an interlocked test box for this. Thanks for the quick response.