ES51964(6600counts)
Dual Display
4.7. ZERO function
In manual DC 6.600A, 66.00A, 660.0A and 6600A, auto DC 66.00A/660.0A and auto DC
660.0A/6600A mesurement modes, ES51964 provides Zero function to remove the residual
current value. Push ZERO bottom less than one second to enter Zero mode. In Zero mode,
main-display shows DN+K - DN, where N = 1, 2, 3, … , DN is the last conversion value
before Zero is pushed, and DN+K is the current conversion value. Sub-display shows nothing
if no other function is activated. If Zero is pushed again in Zero mode, main-display will
update the DN value and displays the DN+K - DN again. The meter returns to normal
operation if Zero is pressed and held for longer than one second. Pressing HOLD in Zero
mode makes the meter stop updating the LCD panel. In 2-range auto DCA modes for
clampmeter (660.0A/6600A or 66.00A/660.0A), 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 from 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
Press Zero
Press Zero > 1s
‘Zero’Active
Press Zero < 1s
Main-display: DN+K - DN
State diagram for Zero + HOLD mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’Active
Press Zero < 1s
Main-display: DN+K - DN
Press Hold
‘Zero’ ‘Hold’Active
LCD stops updating
v2.5
20
09/04/14
CYRUSTEK [ Cyrustek corporation ]
