ES51921
22,000 Counts Auto DMM
1.1.4 The true RMS-to-DC conversion with ES636
If ES636 is used for true RMS-to-DC measurement, the test circuit is shown in Figure 1.
Make ADO and ADI pin short, and TEST5 pin keeps float. Connect OVSG pin to
AGND through a switch in ACV measurement mode. If the DCV and ACV
measurement modes are in the same rotary switch, please also add this switch in the
rotary switch. The configuration of this switch will not influence the precision of DCV
measurement.
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
ACV
2.2u
+
+
-Vs
10u
1
2
3
4
5
6
7
+Vs
14
13
12
11
10 150
9
8
100K
+Vs
500K
2.2u
+
20k
1k
-Vs
100
1K
10K
101K
1.111M
ES51921
Figure 1. The true RMS-to-DC conversion with ES636
ES636
ADI
ADO
AGND
Ver. 3.2
8
10/06/23
CYRUSTEK [ Cyrustek corporation ]
