ES51945(5000counts)
Dual Display/No Cap
2.3 Current measurement for clampmeter
(1) ACA/DCA
ES51945 has 2 automatic and 3 manual current measurement modes for Clampmeter.
The following table summarizes the full-scale range of each mode. When ES51945
operate in the automatic VA1 ~ VA2, it takes high input from IVSH/IVSL (higher
range/lower range), low input from SGND and reference voltage from VR_A (pin29).
When ES51945 operates in the manual VA3 ~ VA5, It takes high input from ADP, low
input from SGND and reference voltage from VA- (pin8).
Mode
VA1
VA2
VA3
VA4
VA5
FC1~4
0,0,0,0
0,0,0,1
0,1,0,0
0,1,0,1
0,1,1,0
Full Scale
50.00A / 50.00A
500.0A / 5000A
50.00A
Input Terminal
IVSL/IVSH V.S. SGND (500mV)
IVSL/IVSH V.S. SGND (500mV)
ADP V.S. SGND (500mV)
ADP V.S. SGND (500mV)
ADP V.S. SGND (500mV)
500.0A
5000A
Note:
1. In DCA current modes (SAC = 0) , ES51945 provides Zero function (push SEL key) for offset removing.
(2) DCuA mode
ES51945 has 2 manual DCuA current measurement modes for flame rod application.
The following table summarizes the full scale range of each mode.
Mode
DCuA1
DCuA2
FC1~4
0,0,1,0
0,0,1,1
Full Scale
500.0uA
5000uA
Input Terminal
ADP V.S. SGND (500mV)
ADP V.S. SGND (500mV)
(3) Low pass filter (LPF) mode for ACA mode
A 3rd order low-pass filter (3dB bandwidth = 4kHz typ.) with is built in ES51945 to
reduce the influence of high frequency noise. The LPF mode is active in ACA only if
DIS_LPF is connected to DGND or floating.
v2.3
12
10/06/25
CYRUSTEK [ Cyrustek corporation ]
