ES51998(60000counts)
DMM Analog front end/Insulation
Status Flag
Duty cycle (<60kHz)
LDUTY=1
10000-D2*10000/D3
LDUTY=0
D2*10000/D3
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.
Auto range consideration for MPU by using Status Flags of frequency mode
Flag
Range
60.000Hz
F_FIN=0
LF=0
F_FIN=1
LF=1*
Hz/Duty=0
F_FIN=1
HF=LF=0
HF=1**
Set range to
60.000kHz
range
600.00Hz
6.0000KHz
60.000KHz
600.00KHz
6.0000MHz
60.000MHz
Change range
depends on data
computed
Data and Range
is not necessary
to be updated
Set range to
60.000Hz 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 = 5.0% & 95.0%)
Freq. range
Duty range*
60.000Hz
600.00Hz
5.0% - 95.0%
6.0000KHz
60.000KHz
10.0 % - 90.0%
20.0% – 80.0%
*Note: Duty range for AC+Hz(%) is 20% ~ 80%.
ver. 1.7
21
12/01/12
CYRUSTEK [ Cyrustek corporation ]
