ES51970(6000counts)
DMM Analog front end with Inrush
The status flag F_FIN indicate the frequency input signal available (> FMIN) or not. If the
computed result less than FMIN, the frequency/duty cycle readings should be set to zero.
The status flags HF & LF are used for fast judgment of proper range. If frequency input is
larger than 7 kHz, HF will be active. If frequency input is floating or frequency detected too
low, LF will be active automatically.
Auto range consideration for MPU by using Status Flags of frequency mode
Flag
Range
60.00Hz
F_FIN=0
LF=0
F_FIN=1
LF=1*
Set Hz/Duty=0
F_FIN=1
HF=LF=0
HF=1**
Set range to
600.0Hz
6.000KHz
60.00KHz
600.0KHz
6.000MHz
60.00MHz
60.00kHz range
Change range
depends on data
computed
Data and Range
is not necessary
to be updated
Set range to
60.00Hz range
Change range
depends on data
computed
*Note: LF=1 @ 60Hz range implies the frequency is not available to be measured. The Hz/Duty readings
should be set to zero.
**Note: When ACV+Hz/ACA+Hz/ADP+Hz mode is selected, the HF status should be ignored. Change range
depends on data calculation result.
Duty cycle mode range (Input sensitivity > 2Vpp @ duty cycle= 5% or 95%)
Freq. range
Duty range
60.00Hz
600.0Hz
5% - 95%
6.000KHz
60.00KHz
10 % - 90%
20% – 80%
ver. 2.8
20
12/01/12
CYRUSTEK [ Cyrustek corporation ]
