Ver 1.5

17/03/29

14

ES166

LCR/DMM analog front

2.2 Current measurement

MCU send write command to select the current measurement function. The Hz mode

measurement is available to be enabled with the ACA function (set AC bit to 1)

simultaneously. The measured signal is applied to IVS terminal (pin4).

See the next table of function command:

F3

F2

F1

F0

AC

Measurement mode

Read data bytes

0

0

0

1

0

DCA mode

D0(12-00)

0

0

0

1

1

ACA+Hz mode

D0(12-00),D1(19-00),D2(19-00)

Note1: D0/D1/D2 all are binary format. SIGN are the sign bit of D0.

Range control for current mode (ACA/DCA)

Q2

Q1

Q0

IOP1

2

Full Scale Range

Input terminal

0

0

0

1

30.00mV 6000counts

IVS

1

0

0

0

0

300.0mV 6000counts

IVS

1

FQ2 FQ1 FQ0

Full Scale Range

0

0

0

N/A

0

0

1

600.0Hz

0

1

0

6.000kHz

0

1

1

60.00kHz

Note: See frequency mode (section 2.6) also. If AC value is less than 1% full scale, the Hz count

should be set to zero by MCU directly.