Hi Manvi,
Are you using a low resolution setting on your 8846A? (For example 4,5 digits or 0.02NPLC) When using high resolution the meter needs a longer integration time. (100NPLC = 100 power line cycles = 2 seconds integration time @ 50Hz mains)
See the 8846A specifications:
4486A-measurements-rates-1000pix.pngSo when set to 4.5 digits / 0.02NPLC the meter should be plenty fast for your application. When you need more resolution 5.5digits / 0.2NPLC might work too. It is a balance between resolution and speed really....
See note 1 for more suggestions for speed improvement (display off, auto range off, math off)
Also see note 4: Your RS-232 speed of 115200baud is mentioned as having a maximum measurement speed of 711 measurements per second. So that should not be a limitation too.
Regards, Gertjan.