ES51945(5000counts)
Dual Display/No Cap
3.3. ZERO function
In manual DC 50.00A, 500.0A and 5000A, auto DC 50.00A/500.0A and auto DC
500.0A/5000A mesurement modes, ES51945 provides Zero function to remove the residual
current value. During DCV and DCA mode are active simultaneously, push SEL key less
than one second to enter Zero mode. In Zero mode, second-display shows DN+K - DN, where
N = 1, 2, 3, … , DN is the last conversion value before SEL is pushed, and DN+K is the
current conversion value. If SEL is pushed again in Zero mode, second-display will update
the DN value and displays the DN+K - DN again. The meter returns to DCV operation only if
SEL is pressed and held for longer than one second. In 2-range auto DCA modes for
clampmeter (500.0A/5000A or 50.00A/500.0A), the system will stay in automatic mode,
even if the Zero function is activated. In other words, it could achieve real automatic
operation. In automatic mode, Zero function could not be entered from higher range, but it
could be still activated if current range is lower one. This is because most residual current
value is so small that the range should stay at lower one in automatic mode. When enter
Zero mode in lower range, the system will store the nonzero counts (residual current value).
If the range goes up to higher one automatically, the non-zero counts will be divided by ten.
So this function will still work well in automatic modes.
State diagram for Zero mode:
Original State (DCV only)
Press SEL < 1s
DCV+DCA
Press SEL < 1s
Press SEL > 1s
Press SEL < 1s
‘Zero’Active
Main-display: DN+K - DN
v2.3
21
10/06/25
CYRUSTEK [ Cyrustek corporation ]
