ES51927
6000 Counts Smart DMM
b.) AC RMS circuit
1
2
3
4
5
6
V-
BT1
ZR3
3V
5.6V
uA
SW1
uA
SW2
LCD Panel
SW SPDT
C3
C4
10uF
J1
ZR1
R1
ZR2
mA
SEG01
1
2
3
4
5
6
7
8
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
BP1
0.1uF
450
D
C
B
A
D
C
B
A
uA
SW3
ZR4
C1
10uF
7.5V
C2
0.1uF
R2
45
9
10
11
12
13
14
15
16
17
18
19
mA
mA
60A
SW4
U1
R3
ZR5
ZR6
4.5
BP2
BP3
BP4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
SEG12
SEG13
SEG14
SEG15
CLAMP
VON
AON
FA
FUA
FC3
FC2
FC1
HOLD
SEL
VAHZ
RANGE
AGND
SEG12
SEG13
SEG14
SEG15
CLAMP
VON
AON
FA
FUA
FC3
SW8
C9
LBAT
220nF
220nF
LBAT
CREF+
CREF-
CINT
CAZ
BUFF
RAZ
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
ADI
ADO
OHMC4
OHMC3
C7
C8
0.1uF
CON19
R4
0.495
R8
R9
R10
R11
470K
60A
150K
100K
100K
Function Switch
SW9
1
1
IVSH
IVSL
100K
J2
J3
R6
FC2
FC1
R5
R12
100
V -
ES51927
C6
HOLD
SEL
VAHz
RANGE
NC
BKLIT
EFEN
BP1
BP2
BP3
BP4
ANNUNC
BKOUT
VR1
20K
R13
R14
R15
R16
R17
100
1K
10K
101K
1.11M
0.005
Gnd
220pF
BKLIT
RANGE
VAHZ
SEL
SW5
SW6
SW7
SW11
SW12
R/C/D/Cont
SW_non lock
SW10
1.5K PTC
ZR8
R7
BKLIT
EFEN
BP1
BP2
BP3
BP4
ANNUNC
SW SPST
SW_non lock
SW_non lock
SW_non lock
SW_non lock
ACVL
ACVH
ZR7
ADO
1
IN
SW16
ACV / RMS
J4
HOLD
C10
22nF
C12
SW_lock
220nF
C13
C14
470nF
47nF
VR1_10M
V -
ES7PWR
APOSEL
BUZIN
SLEEP
SW13
CLAMP
C11
1uF
TRMS Circuit
SW_lock
SW14
VON
AON
FA
R19
27K VR2
10K
1
R18
5K
VR
R22
9K
SW_lock
SW15
-VS_ES7 +VS_ES7
-VS_ES7
+VS_ES7
ADP
V -
SW_lock
SW17
1
2
3
4
8
7
6
5
2
ZR9
5.6V
RL
Vin
COM
+ VS
PwrDown Vout
-
6
ACVH
J5
SW_lock
SW18
ES7PWR
3
R27
1K
U3
TL061
+
FUA
FC3
BZ1
Buzzer
- VS Cav
SW_lock
SW19
U2 ES7
C18 2.2uF
-VS_ES7
-VS_ES7 +VS_ES7
R23
47K
+ C20
2.2uF
R24
10K
R25 1.5K
SW_lock
SW20
C16
C17
+
FC2
VR4
100K
+
SW_lock
SW21
C19
1uF ADO
10uF
10uF
Title
FC1
VR3
50K
ES51927 6000 Counts Smart DMM
SW_lock
SW22
Size
B
Number
Revision
EFEN
Application Circuit ( TRMS )
SW_lock
Date:
File:
30-Aug-2007
D:\Protel file\ES51928 Serial.ddb
Sheet of
Drawn By:
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Notes:
1. The ESD protection circuits protect most of pins. However pins, V+, V-, AGND, DGND and VR1
are not protected enough because the parasitic effect must be decrease. Therefore enough external
protection is needed for assembling, carrying and keeping. In addition, components connecting to
these unprotected pins have to be soldered on board before the IC is soldered.
2. All the zener diodes above are used for IC protection. These protections are needed and these zener
diodes must be soldered on PCB first before soldering ES51927 on.
3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (6/60nF
range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.9
21
10/06/25
CYRUSTEK [ Cyrustek corporation ]
