The device is supposedly a 6½ digit DMM yet I currently don’t even trust the first few digits when comparing it to a 3½ digit handheld Brymen DMM. Being reasonably sure that it’s at least more accurate than the Brymen would be nice, so 3½ digits.

I’ve got another desktop DMM, a 5½ digit GW Instek GDM-8255A, on the way, so I could conceivably just use that one as my local “standard” to calibrate against.

The problem however is that the Philips requires a large amount of references to calibrate against (just calibrating DC voltage requires 0V, 3V, 30V and 300V references). Building all references to recalibrate the whole thing would be rather involved, so I was trying to find an easier way.