1. For the general purpose DMM of Table 2.4.1, which contributes the larger share of inaccuracy; the full scale percentage or the count spec?
2. Bearing in mind that the power supply display is really just a very limited sort of digital volt meter, which voltages in Table 2.4.3 and 2.4.4 do you suspect to be the most accurately measured and why?
3. Assuming that the precision DMM used in Table 2.4.4 has a base accuracy spec of 0.1% plus 2 counts and is properly calibrated, what is the range of possible “true” voltages measured for 15.0 volts on the 20 volt scale?