First off, you can't just plug a display and a mouse into one and just use it like a scope. You have to send it SCPI commands for configuration, either over GPIB, USB, or LAN.
Secondly, there doesn't seem to be an easy way to run the scope untriggered. I haven't tried doing the web-page control because I can't put mine on a LAN, at least not without a lot of work.
I hooked up the GPIB connector to my PXI chassis and the scope wasn't found. However that seems likely to have been due to the GPIB driver on my PXI CPU failing, as later on the power supply wasn't found either but was recovered when I rebooted the CPU. I was able to hook up using a USB cable which worked great. The scope was assigned a VISA address and I started playing with example VIs in Labview.
None of the VIs for the scope supported untriggered operation. In all examples, the steps consisted of opening, configuration of vertical and horizontal ranges, and taking either a single reading or repeadedly requesting single readings. In many cases if the readings were out of range or no trigger was found, the VIs returned errors or timeouts.
I began searching for the user manual for the scope, which was a long and fruitless search.
Support documents page for the scope. An unhelpful mix of white papers, 3D drawings, and FAQs. There is a "User's Guide" for the entire series of scopes which was a tiny bit of help. The programming guide seems like the most relevant document but I didn't have time to dig into the low-level SCPI commands.
This fact sheet clued me into the existence of the web browser interface: http://literature.cdn.keysight.com/litweb/pdf/5989-7200EN.pdf
This so-called Data Sheet was mostly an advertising brocure: http://literature.cdn.keysight.com/litweb/pdf/5989-5470EN.pdf
Here's the user guide for the 5000,6000, and 7000 series scopes. Has barely a mention of the 6000L series. I did learn that the 6000 series scope alone doesn't handle certain active probes. http://literature.cdn.keysight.com/litweb/pdf/54695-97026.pdf
The "What's included," both here and on the Newark website seems to indicate that a User Manual was shipped with the scope, and it wouldn't have been the one for the full 6000 series scope. But I can't find it. http://www.keysight.com/en/pdx-x202272-pn-DSO6014L/low-profile-oscilloscope-100-mhz-4-analog-channels
The User's Guide does mention that the 6000L series scope requires this GPIB extender, because apparently somebody forgot that a lot of GPIB cables come out sideways from the connector and somebody put a bulge in the case for a power supply right next to the GPIB connector on the back of the chassis. https://www.artisantg.com/TestMeasurement/63656-20/Keysight_Agilent_10834A_HP_IB_Adapter
Here's a link to a 6000 series-only manual, probably an earlier one than is presently available. It does mention that the web interface should allow operation of the 6000L just as if it were a full scope, so I need to give that a try: http://ridl.cfd.rit.edu/products/manuals/agilent/oscilloscopes/6000seriesmso.pdf
