3 3/4 CAP AUTO DMM
1.2 Current measurement
Current measurement has three modes. The following table summarizes the full scale
range of each mode.
Mode
Automatic Mode 1
Automatic Mode 2
Automatic Mode 3
Manual Mode
Range Selection
µA
mA
A
A
Full Scale
400.0µA / 4000µA
40.00mA / 400.0mA
40.00A / 4.000A
40.00A
ES51984
1.3 Capacitance Measurement
The following table summarizes the eight ranges of capacitance measurement mode.
Configuration
C1
C2
C3
C4
C5
C6
C7
Full Scale Range
4.000nF
40.00nF
400.0nF
4.000µF
40.00µF
400.0µF
4mF
Resistance Ratio
R1
R1
‖
R2
R1
‖
R3
R4
-
-
-
Note:
1. In order to obtain an accurate reading, a capacitor must be discharged before
measurement begins. The chip has a built-in discharge mode to automatically
discharge the capacitor. In discharge mode, the LCD displays
DS.C
2. Discharging through the chip is quite slow. We recommend the user to discharge the
capacitor with some other apparatus.
1.4 Continuity Check
Continuity check shares the same configuration with 400.0Ω manual resistance
measurement mode, but with buzzer output to indicate continuity. The buzzer generates a
2KHz sound whenever the digit number less than 25Ω. Because the cycle time of
measurement is only 70ms, the least significant digit will not display.
1.5 Diode Measurement
Diode measurement mode shares the same configuration with 4.000V manual voltage
measurement mode. If the test circuit is open or the voltage drop between the two ports
of the device (diode) under test is larger than 2V, the LCD panel will show “OL”. The
buzzer generates a 2KHz sound whenever the digit number is less than 0.25V. Because
8
11/01/05
CYRUSTEK [ Cyrustek corporation ]
