ES51981
3 1/2 AUTO DMM
Note
:
1.Full Scale
Function Description
1. Operating Modes
1.1 Voltage Measurement
A reconfigurable voltage divider automatically provides a suitable range in voltage
measurement mode. The following table summarizes the full scale ranges in each
configuration.
Configuration
VR1
VR2
VR3
VR3
VR5
Full Scale Range
200.0mV
2.000V
20.00V
200.0V
2000V
Divider Ratio
1
1/10
1/100
1/1000
1/10000
Resister Connection
-
R2 / (R1+R2)
R3 / (R1+R3)
R4 / (R1+R4)
R5 / (R1+R5)
1.
2.
200.0mV range only exists in manual mode.
In the 2000V range, if the digit numbers is larger than 1000V, LCD will display
“OL”.
The measurement of true RMS using ES636
If ES636 (or other true RMS-to-DC converter chip) is used for true RMS measurement,
the suggested application circuit is shown below. When ES636 is used for true RMS,
ADO and ADI pin short together, TEST5 pin keeps floating, and ACVL pin connects to
SGND. And the OVSG pin shorts to AGND through a switch.
6
08/09/09
CYRUSTEK [ Cyrustek corporation ]
