I'll attach a snippet from the 2182A data sheet and post the link to download the datasheet as well as the reference manual below.
The reference manual will have all of the SCPI and operational information you would need for your application.
Models 2182A Nanovoltmeter User‚s Manual | Tektronix
See section 13 for SCPI command reference. Also, to manipulate speed I would alter your NPLC, delays, filters, etc. to fit your specific needs.