ES239 Datasheet, PDF (7/36 Pages) Cyrustek corporation – 6000 Counts DMM / Inrush

ES239
6000 Counts DMM / Inrush
Function Description
1. Operating Modes
1.1. Semi-auto calibration scheme
ES239 includes DMM & Clamp-on meter features in single chip. DMM manufacturers need the calibration
process in production. The traditional solution needs the variable resistors for calibration by manual adjustment.
ES239 provide another calibration scheme and the most variable resistors could be ignored. When ES239 is at
OFF-state, pull CALENP (pin 51) to V- to active the calibration scheme after re-power on. A digital controlled
voltage output will be active from DACO. When semi-auto calibration scheme is active, use HOLD (or
BKLIT) key to decrease voltage and use RANGE (or MMX) key to increase the voltage. Decrease the
reference voltage means the counts on display will be increased. Increase the reference voltage means the
counts on display will be decreased. The adjustment step is approximate one count. If coarse adjustment is
required, push HOLD (or BKLIT) and RANGE (or MMX) larger than one second to speed up to
approximate 10 counts per second. After calibration process is finished, push HOLD (or BKLIT) and
RANGE (or MMX) less than 1 sec. simultaneously to save the digital control code to external EEPROM
(24LC02).
The semi-auto calibration scheme supports the following nine measurement modes. When CALENP pin is
active, set the proper function switches or push KEY to choose the target measurement mode. When mode is
selected, the LCD segment of Unit at related measurement will be blinking.
Mode
Default Range For CAL
Remark
Voltage Measurement
mV Voltage Measurement
6.000V (DC/AC separated)
600.0mV (DC/AC separated)
Accuracy of other ranges is guaranteed
by external resistor.
DC Current Measurement For
Multimeter
AC Current Measurement For
Multimeter
DC Current Measurement For
Multimeter (A)
600.0μA or 6000μA
( 2 modes choose one for calibration )
600.0μA or 6000μA
(2 modes choose one for calibration )
6A or 20A
Auto 2 ranges choose one, proposed to
use a large range to calibration.
Auto 2 ranges separated for calibration
is necessary.
Auto 2 ranges choose one, proposed to
use a large range to calibration.
AC Current Measurement For
Multimeter (A)
6A or 20A
Auto 2 ranges individual for
calibration is necessary.
DC Current Measurement For
600.0A or 6000A
Auto 2 ranges choose one, proposed to
Clampmeter
( 6 modes choose one for calibration ) use a large range to calibration.
AC Current Measurement For
600.0A or 6000A
Auto 2 ranges separated for calibration
Clampmeter
( 6 modes choose one for calibration ) is necessary.
Capacitor Measurement
60.00nF
Temperature Measurement
600.0℃
Lower range in auto temperature
measurement.
ADP Measurement
6000 / 600.0 / 60.00 / 6.000
4 ranges separated for calibration.
After calibration procedure is finished, set ES239 to OFF-state and set CALENP (pin51) to DGND or kept
floating to return to normal mode operation after re-power on.
V 2.2
7
2015/12/15