ES51931
22,000 Counts Auto DMM
1.1.5 Low-pass filter feature
ES51931 provides a 3-order low-pass filter to reduce the influence of high frequency
noise. This LPF feature is available in ACV or ACA modes. Set FC5 to low in these
modes, the KEY button is used to activate the LPF feature. Press KEY button for less
than 1 second to select the 3dB bandwidth of LPF sequentially (Full/10kHz/1kHz) and
the relative LCD segment on LCD panel will be active also.
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 220.00MΩ, if SHIFT pin connects to V-,
the least digit will not be displayed and the other digits and decimal point will shift
right away. So the full scale becomes 220.0MΩ instead of 220.00MΩ.
Configuration
OR1
OR2
OR3
OR4
OR5
OR6
OR7
Full Scale Range
220.00Ω
2.2000KΩ
22.000KΩ
220.00KΩ
2.2000MΩ
22.000MΩ
220.00MΩ
Divider Ratio
R6
R5
R1
∥
R4
R1
∥
R3
R1
∥
R2
R1
R1
Resister Connection
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
10MΩ
1.3 Current measurement for multimeter
ES51931 has 2 automatic and 1 manual current measurement modes for multimeter.
The following table summarizes the full-scale range of each mode. When ES51931
operates 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.
Mode
Automatic1
Automatic2
Manual
Note:
1. The typical connection of input terminal is as the schematic below:
FC1~4
1,1,0,1
1,1,1,1
0,0,0,0
VBAR
1
1
X
Full Scale
Input Terminal
220.00µA / 2200.0µA IVSL/IVSH V.S. SGND
22.000mA / 220.00mA IVSL/IVSH V.S. SGND
22.000A
IVSH V.S. SGND
Vin*
9R
R
100K
100K
IVSL
IVSH
Ver. 1.2
8
10/05/27
CYRUSTEK [ Cyrustek corporation ]
