ES51945(5000counts)
Dual Display/No Cap
2.4 Resistance Measurement ( R )
A re-configurable divider automatically provides a suitable full-scale range in resistance
measurement mode. The following table summarizes the full-scale ranges and the reference
resistors in each configuration.
Configuration
OR1
Full Scale Range
500.0Ω
Relative Resistor
OR1
Equivalent value
100Ω
OR2
5.000KΩ
VR5
1KΩ
OR3
OR4
OR5
OR6
50.00KΩ
500.0KΩ
5.000MΩ
50.00MΩ
VR4 || VR1
VR3 || VR1
VR2 || VR1
VR1
10KΩ
100KΩ
1MΩ
10MΩ
2.5 Continuity Check ( S )
Continuity check shares the same configuration with 500.0Ω manual resistance
measurement mode and has buzzer output to indicate continuity. The buzzer generates
2KHz beep and ALARM1 (pin 105) drive high output (V+ level) whenever the reading is
less than 30Ω. The ES51945 built in a high speed short detection circuit and the detection
could be less than 10ms.
2.6 Diode Measurement ( D )
Diode measurement mode shares the same configuration with 5.000V manual voltage
measurement mode and has buzzer output to indicate continuity. The buzzer generates a
2KHz sound and Alarm1 (pin 105) drive high output (V+ level) whenever the reading is less
than 30mV. If the test circuit is open or the voltage drop between the two ports of the diode
under test is larger than 2V, the LCD panel will show “OL”.
2.7 Frequency counter
In frequency mode, main-display shows frequency and sub-display shows duty cycle at the
same time. The time base of the frequency counter is derived from an external crystal
oscillator by
4,000,000
Tcounter
=
Fosc
v2.3
13
10/06/25
CYRUSTEK [ Cyrustek corporation ]
