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ES238 Datasheet, PDF (25/37 Pages) Cyrustek corporation – 6000 Counts DMM / Peak
ES238
6000 Counts DMM / Peak
3.7. PEAK-HOLD Function
Peak mode takes input from Pmax or Pmin pin. The peak values are stored in external capacitors.
Polyester Mylar capacitors are recommended. The precision of Peak mode measurement can be
enhanced by calibration. Calibration for Peak mode is invoked by pressing PEAK key for more than
2 seconds. Entering Peak mode will automatically execute peak calibration, if peak calibration was
never done before. The Calibration process measures and stores the offset voltage of internal
operation amplifiers. High precision is achieved by subtracting this offset from reading. ES238 will
automatically execute peak calibration, if peak mode is activated again.
The flow chart of PEAK function is shown below:
1 push > 1 s
Original State
(Auto/Manual)
1 push > 1 s
1 push < 1 s
CALIBRATION
〝Pmax〞active.
〝Pmin〞active.
Display: Max. Peak Value 1 push < 1 s Display: Min. Peak Value
push HOLD
push HOLD
〝Pmax〞〝, HOLD〞active.
〝Pmin〞〝, HOLD〞active.
Display: Max. Peak Value 1 push < 1 s Display: Min. Peak Value
3.8. ZERO Function
In manual DC 6.000A, 60.00A, 600.0A and 6000A, auto DC 60.00A/600.0A, and auto DC
600.0A/6000A (please refer to section 1.5) mesurement modes, ES238 provides ZERO function to
remove the residual current value. Push REL key less than one second to enter ZERO mode. In
ZERO mode, the LCD panel displays DN+K - DN, where N = 1, 2, 3, … , DN is the last conversion
value before REL key is pushed, and DN+K is the current conversion value. If REL key is pushed
again in ZERO mode, the meter will refresh the DN value and displays the DN+K - DN again. The
meter returns to normal operation if REL key 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 (600.0A/6000A or 60.00A/600.0A), 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
could not be higher 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 nonzero counts will be divided by ten. So this function will still work well in automatic modes.
V 2.2
25
2015/12/15