ES51927
6000 Counts Smart DMM
1.1.2 HCF detection
ES51927 provides detection of high-crest-factor (HCF) signal in ACV auto range
mode. ES51927 senses the signal and determines it as HCF if the Vpp is large
enough. Once the signal is determined as HCF, ES51927 will jump up one
measuring range regardless of current measurement value. It takes 60ms to jump
one range up. The jumping up process will continue until the maximum range is
reached. With HCF detection, a more accurate result could be obtained. For
example, when a input signal with Vpp=350V, Vrms=70V(CF=5) was applied,
traditional DMM might stay at 60V range but shows counts with the amount of
error up to 10% or even bigger. The error rises from limited input/output swing
at internal ADC. With HCF detection, DMM will stay at 600V range and exhibits
more accurate results.
1.1.3 EF mode
ES51927 supports a non-contact ac voltage measurement, which is called electric
field measurement also. The EF mode is selected by SEL key when EF_EN is
active. The ADC input is configured from ADP pin vs. SGND. When no or less
electric field is detected, the LCD shows “EF”. If the detector senses electric
field, the strength will be showed on LCD by “-“ not digits type. Level 1(weak)
is “-“ and the level 4(strong) is “----“. Additional beeper will be output from
BUZOUT pin. The buzzer frequency depends on the strength of electric field also.
The Faster beeper means the stronger electric field (ac voltage) is sensed.
Ver 2.9
7
10/06/25
CYRUSTEK [ Cyrustek corporation ]
