3 3/4 CAP AUTO DMM
Capacitance
Measurement accuracy
4nF range
40nF – 4µF
4µF~4mF
*The
accuracy of 40uF range is 1.5%F.S
-1.5
-2
-0.8
-2
-1.1*
-2
—
—
—
—
—
—
1.5
2
0.8
2
1.1*
2
%F.S
counts
%F.S
counts
%F.S
counts
ES51984
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
400.0mV
4.000V
40.00V
400.0V
4000V
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.
400.0 mV range only exists in manual mode.
In the 4000V range, if the digit number 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 in Figure 1. When ES636 is used for true
RMS, make ADO and ADI pin short, keep TEST5 pin float, and connect ACVL pin to
SGND. And connect OVSG pin to AGND through a switch in ACV mode.
6
11/01/05
CYRUSTEK [ Cyrustek corporation ]
