ES51968(6600counts)
Dual Display/Inrush
2.4 Current measurement for clampmeter
ES51968 has 2 automatic and 4 manual current measurement modes for Clampmeter. The
following table summarizes the full-scale range of each mode. When ES51968 operate in
the automatic mode1&2, it takes high input from IVSH/IVSL (higher range/lower range),
low input from SGND and reference voltage from VR. When ES51968 operates in the
manual mode1~4, It takes high input from ADP, low input from SGND and reference
voltage from VA+ and VA-.
1
VBAR
Full Scale
Input Terminal
Mode
FC1~4
Automatic1
1,1,0,1
0
660.0A / 6600A
IVSL/IVSH V.S. SGND (66mV)
Automatic2
1,1,1,1
0
66.00A / 660.0A
IVSL/IVSH V.S. SGND (66mV)
Manual1
1,1,0,0
X
6.600A
ADP V.S. SGND (660mV)
Manual2
1,0,0,0
X
66.00A
ADP V.S. SGND (660mV)
Manual3
1,0,1,0
X
660.0A
ADP V.S. SGND (660mV)
Manual4
1,0,0,1
X
6600A
ADP V.S. SGND (660mV)
Note:
1. Connect VBAR to V- will disable the “µ
2
” / ”m
2
” symbol on LCD panel. Inrush mode could be active when
VBAR=0.
2. In DC current modes for clampmeter, ES51968 provides
Zero function
for offset removing.
2.5 Low pass filter (LPF) mode for ACA/ACV mode
A 3
rd
order low-pass filter with is built in ES51968. The LPF mode is active
automatically when the input AC frequency of voltage or current is less than 500Hz. That
means if the frequency is lower, the LPF mode (3dB BW = 7.5kHz typ.) will be helpful to
filter-out the high frequency noise of the main signal. When LPFOFF (pin 114) is pulled to
V-, the LPF mode will be disabled always. For Inrush mode is active, the auto LPF is active
always even LPFOFF is enable.
v2.5
10
09/04/14
CYRUSTEK [ Cyrustek corporation ]
