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參數(shù)資料
| 型號(hào)： | ES51918 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 11,000 Counts Auto DMM |
| 中文描述： | 11,000計(jì)數(shù)汽車(chē)萬(wàn)用表 |
| 文件頁(yè)數(shù)： | 10/32頁(yè) |
| 文件大?。?/td> | 510K |
| 代理商： | ES51918 |
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v1.02 05/06/30
10
ES51918
11,000 Counts Auto DMM
1.1.6
The true RMS-to-DC conversion with ES7R
If ES7R is used for true RMS-to-DC measurement, the test circuit is shown in Figure 3.
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. The 500k
VR, 1k
resistor and 10
resistor are used for external
offset trim. If users don’t want to use external offset trim, please remove these 3
resistors and connect pin1 of ES7R to pin8 of ES7R.
Figure 3. The true RMS-to-DC conversion with ES7R
+Vs
AGND
-Vs
500K
1K
100
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
1.111M
101K
10K
1K
99.5
AGND
ACV
AGND
30K
1
2
3
4
8
7
6
5
E
2.2u
+
+Vs
AGND
-Vs
100K
1.5K
-Vs
N1
N2
AGND
+Vs -Vs
2
3
1
5
4
7
6
AGND
1u
+
47K
TL061
E
10K
ADI
ADO
ADOHZ
AGND
PWD
OP-
OP+
OPO
AGND
10K
30K
0.1u
+Vs
+Vs
-Vs
4.7u
Note: The filter capacitors for +Vs
and -Vs are recommended to near to
the power terminals of ES7R and
external OPAMP.
1
1
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