V 2.2

7

2015/12/15

ES233

4000 Counts DMM

Function Description

1. Operating Modes

1.1.

Semi-auto calibration scheme

ES233 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.

ES233 provide another calibration scheme and the most variable resistors could be ignored. When ES233 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 1sec. 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

4.000V (DC/AC separated)

Accuracy of other ranges is guaranteed

by external resistor.

mV Voltage Measurement

400.0mV (DC/AC separated)

DC Current Measurement For

Multimeter (uA/mA)

400.0μA or 4000μA

( 2 modes choose one for calibration )

Auto 2 ranges choose one, proposed to

use a large range to calibration.

AC Current Measurement For

Multimeter (uA/mA)

400.0μA or 4000μA

( 2 modes choose one for calibration )

Auto 2 ranges separated for calibration

is necessary.

DC Current Measurement For

Multimeter (A)

4A or 20A

Auto 2 ranges choose one, proposed to

use a large range to calibration.

AC Current Measurement For

Multimeter (A)

4A or 20A

Auto

2

ranges

individual

for

calibration is necessary.

DC Current Measurement For

Clampmeter

400.0A or 4000A

( 6 modes choose one for calibration )

Auto 2 ranges choose one, proposed to

use a large range to calibration.

AC Current Measurement For

Clampmeter

400.0A or 4000A

( 6 modes choose one for calibration )

Auto 2 ranges separated for calibration

is necessary.

Capacitor Measurement

40.00nF

Temperature Measurement

400.0℃

Lower range in auto temperature

measurement.

ADP Measurement

4000 / 400.0 / 40.00 / 4.000

4 ranges separated for calibration.

After calibration procedure is finished, set ES233 to OFF-state and set CALENP (pin51) to DGND or kept

floating to return to normal mode operation after re-power on.