1.2 Resistance Measurement
A re-configurable divider automatically provides a suitable full-scale range in resistance
measurement mode. The following table summarizes the full-scale ranges and the
reference resistors in each configuration. In 110.0MΩ, the maximum counting number
is 1100 counts and the resolution is 0.1MΩ. So the full scale becomes 110.0MΩ.
Configuration
OR1
OR2
OR3
OR4
OR5
OR6
OR7
Full Scale Range
110.00Ω
1.1000KΩ
11.000KΩ
110.00KΩ
1.1000MΩ
11.000MΩ
110.0MΩ
Divider Ratio
R6
R5
R4
R1
‖
R3
R1
‖
R2
R1
R1
Resister Connection
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
10MΩ
1.3 Current measurement
ES51911 has 2 automatic and 1 manual current measurement modes for multimeter and
5 manual current measurement modes for clampmeter. The following table summarizes
the full-scale range of each mode. When ES51911 operate in the current measurement
modes for multimeter, It takes high input from pin IVSH or IVSL, low input from pin
SGND and reference voltage from pin VR. When ES51911 operate in the current
measurement modes for Clampmeter, It takes high input from pin ADP, low input from
pin SGND and reference voltage from pins VA+ and VA-. The test circuits are shown in
page 27-28.
Mode
Automatic Mode 1
Automatic Mode 2
Manual Mode 1
Manual Mode 2
Manual Mode 3
Manual Mode 4
Manual Mode 5
Manual Mode 6
Note:
1. In Manual DC current measurement modes for clampmeter, ES51911 provides Zero function for offset
removing.
2. In Automatic mode1 and Automatic mode2, the pin VBAR is used to control the display of “µ” and
“m” sign on the LCD panel. If pin VBAR is floating or connected to DGND, the “µ” and “m” sign will
be displayed. If pin VBAR is connected to V-, the “µ” and “m” sign will not be displayed.
Range Selection
µA
mA
A
A
A
A
A
A
Full Scale
110.00µA / 1100.0µA
11.000mA / 110.00mA
11.000A
1.1000A
11.000A
110.00A
1100.0A
11000A
Designed for
Multimeter
Multimeter
Multimeter
Clampmeter
Clampmeter
Clampmeter
Clampmeter
Clampmeter
v1.2
9
11/09/06
CYRUSTEK [ Cyrustek corporation ]
