Vertical offset works to nullify large DC from signal that has large DC with some AC on top. In which case you subtract DC part and amplifier gets only the rest. You could do that with AC coupling, but DC coupling with offset retains absolute voltage values for correct measurements.
Different scopes have different DC offset ranges. One thing I like about SDS2000X HD is extended offset in comparison to other scopes in class.. Useful for work on power circuits, well complemented with 12 bit, low noise and analysis package..
Exactly!! The DC Offset is very beneficial when one doesn't want the low corner of the AC coupling to alter the signal of interest. The SDS2000X+ also has a nice wide DC Offset range that is stable and doesn't add noise!!
Does the HD version have a wider DC Offset range than the X+ ?
Best,
Hi Mike,
it does, quite more:
------------------------------------------
SDS2000X+ :
Offset range (probe 1X)
500 μV/div ~ 100 mV/div: ± 2 V
102 mV/div ~ 1 V/div: ± 20 V
1.02 V/div ~ 10 V/div: ± 200 V
------------------------------------------
SDS2000X HD
Offset range (probe 1X)
1 MΩ:
0.5 mV/div ~ 5 mV/div: ±1.6 V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 100 mV/div: ±16 V;
102 mV/div ~ 200 mV/div: ±80 V;
205 mV/div ~ 1 V/div: ±160 V;
1.02 V/div ~ 10 V/div: ±400 V
50 Ω:
0.5 mV/div ~ 5 mV/div: ±1.6V;
5.1 mV/div ~ 10 mV/div: ±4 V;
10.2 mV/div ~ 20 mV/div:±8 V;
20.5 mV/div ~ 1 V/div: ±10 V
Take care!