Hello everybody, sorry if this question has already been answered, I haven't been able to find it. Could anybody please let me know what are the units of numbers which we put in a slew block to determine slew time? Are those samples? Most probably not. Please help!

Hello Skfir,

I couldn't find any slew-volume specs either, so I set out to measure it. In the circuit below, a square wave feeds the slew volume control. The result can be seen on the Real-Time Display as an exponential rise and fall, so we can model the Slew Volume control as a first-order "RC" with a time constant.

The Real-Time Display, however, is inconvenient for accurate measurements. Thus, the circuit has Stopwatch cells counting samples as the slew output rises from 0 to 0.63, and falls from 1 to 0.37 (either is one time constant). The read-back cells are scaled to show the time constant in units of 0.05 ms, considering the 48K sample rate and the read-back's four-bit truncation (divide by 16).

Here's the results expressed in time constant as well as the dB / s spec used elsewhere in SigmaStudio:

Best regards,

Bob