ES51982
3 1/2 CAP AUTO DMM
Reference voltage temperature
Coefficient
100KΩ
Between
resister
VRH
—
—
ppm/℃
TCRF
50
0℃<TA<70℃
2nF range
%F.S
-1.5
-2
—
—
1.5
2
counts
Capacitance
Measurement accuracy
%F.S
counts
%F.S
-0.8
-2
—
—
—
—
0.8
2
20nF – 2µF
2µF~2mF
-1.1*
-2
1.1*
2
counts
*The accuracy of 20uF range is 1.5%F.S
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
Full Scale Range
200.0mV
2.000V
Divider Ratio
1
Resister Connection
-
VR2
VR3
VR3
VR5
1/10
1/100
1/1000
1/10000
R2 / (R1+R2)
R3 / (R1+R3)
R4 / (R1+R4)
R5 / (R1+R5)
20.00V
200.0V
2000V
1. 200.0mV range only exists in manual mode.
2. In the 2000V 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 ]
