ES51926 [CYRUSTEK]
3000 Counts Smart DMM; 3000计数智能数字万用表型号: | ES51926 |
厂家: | Cyrustek corporation |
描述: | 3000 Counts Smart DMM |
文件: | 总22页 (文件大小:417K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ES51926
3000 Counts Smart DMM
Features
General description
z
z
z
z
3000 counts LCD display
3V DC power supply
ES51926 is an integrated ADC with 3000 counts
LCD display driver. It could support fully
automatic DMM function measurement. In
voltage or current mode, the AC or DC signals
auto scanning. In R/D/C (passive component)
Conversion rate: 4 times/s (voltage mode)
Full automatic measurement:
*Voltage/Current: AC/DC auto scanning
& auto range: 3.000V~1000V
*Resistance/Diode/Capacitance(RDC scan)
(Taiwan patent no.: 326361)
Auto scanning & auto range:
Resistance: 300.0Ω~3.000MΩ
Capacitance: 3.000nF~300.0uF
(Taiwan patent no.: 323347,453443)
Push functions
mode,
resistance
(including
continuity),
capacitance or diode measurements are allowed
by fully automatic detection. A single key and
simple switch could select all measurements.
Expensive and bulky mechanical range switches
are not required. A non-contact electric field
detector (EF mode) is built-in for ac voltage
measurement also. Other features including
range control, data hold, max/min hold, VAHz
and back light function are available. For power
saving, an auto power off & re-power on scheme
are built-in. A sleep output is the indication of
entering auto power off mode.
z
Function selection by single key
Range change function
Hold function
MAX/MIN function
VAHZ function
Back light function
z
z
Support non-contact voltage detection
High voltage (> 30V) indication of LCD
display for voltage measurement
(Taiwan patent no.: 234661)
Built-in HCF(high crest factor detection)
function in AC mode
z
z
z
z
OL level selection (600V/1000V/1500V)
Band-gap reference voltage output
Auto power off (3min. or 10min.) &
re-power on
z
z
z
Sleep output indication
On-chip buzzer driver
Low battery detection
Application
z
Smart digital multi-meter
z
Smart clamp meter
Ver 2.9
1
10/06/25
ES51926
3000 Counts Smart DMM
Pin Assignment
50
45
40
35
30
NC
NC
NC
NC
SEG11
SEG10
NC
NC
NC
80
SEG09
SEG08
SEG07
SEG06
SEG05
SEG04
SEG03
SEG02
SEG01
OSC2
OSC1
BKSEL
CESEL
C+
ACEN
BUZOUT
APOSEL
BUZIN
SLEEP
R1K
R9K-
CA+
CA-
NC
VR1
VA-
VA+
Cyrustek.
com.tw
85
90
ES51926
ADP
SGND
VR
VRH
NC
C-
V-
V-
V+
95
V+
OHMC1
OHMC2
DGND
AGND
Pin Description
Pin No
Symbol
AGND
LBAT
Type
P
I
Description
1
2
Analog ground.
Low battery configuration. If 3V battery is used, connect it to DGND.
The default low-battery threshold voltage is –2.3V. If 9V battery is
used, the low battery enunciator is displayed when the voltage of
this pin is less than VRH (-1.2V)
3
4
5
6
7
8
CREF+
CREF-
CINT
CAZ
BUFF
RAZ
I/O Positive connection for reference capacitor.
I/O Negative connection for reference capacitor.
O
I
Integrator output. Connect to integral capacitor
Auto-zero capacitor connection.
O
O
Buffer output pin. Connect to integral resistor
Buffer output pin in high-speed mode. Connect to high-speed integral
resistor.
9
10
IVSH
IVSL
I
I
High current measurement input.
Low current measurement input
Ver 2.9
2
10/06/25
ES51926
3000 Counts Smart DMM
11
12
13
14
15
16
17
18
19
20
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
I
I
I
O
O
O
O
O
Input high voltage for resistance/capacitor measurement
Output connection for resistance/capacitor measurement
Sense low voltage for resistance measurement
Reference resistor connection for 300.0Ω range
Voltage measurement ÷10000 attenuated (1000V)
Voltage measurement ÷1000 attenuated (300.0V)
Voltage measurement ÷100 attenuated (30.00V)
Voltage measurement ÷10 attenuated (3.000V)
I/O Test pin
I
DC signal low input in ACV/ACA mode. Connect to negative output of
external AC to DC converter.
21
ACVH
I
DC signal high input in ACV/ACA mode. Connect to positive output of
external AC to DC converter.
22
23
24
25
26
27
28
29
30
31
32
33
ADI
ADO
I
O
O
O
O
O
-
O
I
I
Negative input of internal AC to DC OP Amp.
Output of internal AC to DC OP Amp.
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
OHMC4
OHMC3
OHMC2
OHMC1
NC
VRH
VR
SGND
ADP
VA+
Output of band-gap voltage reference. Typically –1.2V
Reference input voltage connection. Typically –400mV
Signal Ground.
Measurement input in ADP mode
For ADP mode. De-integrating voltage positive input. The input should
be higher than VA-.
I
I
34
VA-
I
For ADP mode. De-integrating voltage negative input. The input should be
lower than VA+.
35
36
VR1
NC
I
-
Measurement input.
37
38
CA-
CA+
I/O Negative auto-zero capacitor connection for capacitor measurement
I/O Positive auto-zero capacitor connection for capacitor measurement
39
40
41
42
43
44
45
46 – 50
51
R9K
R1K
O
O
O
I
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Sleep mode indicator, asserts low in SLEEP mode. Normal V+ output.
Pull to V- to enable the BUZOUT.
Auto power off idle time selection.
Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
Output to V- when AC mode inactive and output to V+ in AC mode.
SLEEP
BUZIN
APOSEL
BUZOUT
ACEN
NC
I
O
O
-
BKOUT
O
If BKLIT function is enabled, this pin will change from –3V to +3V
for 60 sec, once press BKLIT pin again within 60 sec, this pin will change
back to –3V.
52
ANNUNC
O
Square wave output at the backplane frequency, synchronized to BP1.
ANNUNC can be used to control display annunciator. Connect a LCD
segment to ANNUNC to turn it on; connect an LCD segment to its back
plane to turn it off.
53
54
55
56
57
58
59
60
61
BP4
BP3
BP2
O
O
O
O
I
I
I
I
I
LCD backplane 4
LCD backplane 3
LCD backplane 2
LCD backplane 1
Pull-low to enable non-contact AC voltage detection
Back light function. Pulse low to set BKOUT pin output.
Pulse to V- to enable MAX/MIN function.
Pulse to V- to enable manual mode and manual range selection.
Pulse to V- to enable VAHz mode.
BP1
EFEN
BKLIT
MAX/MIN
RANGE
VAHz
Ver 2.9
3
10/06/25
ES51926
3000 Counts Smart DMM
Pulse to V- to select target measurement
62
SEL
I
63
64
HOLD
FC1
I
I
Pulse to V- to enable HOLD function.
Switch 1 for function selection.
65
FC2
I
Switch 2 for function selection.
66
FC3
I
Switch 3 for function selection.
67
68
69
70
FUA
FA
AON
VON
I
I
I
I
I
O
-
O
I
O
Switch 1 for current measurement selection.
Switch 2 for current measurement selection.
Pull to high to sense current measurement priority in auto scan mode
Pull to high to sense voltage measurement priority in auto scan mode
Switch for clamp meter application function
LCD segment line 10 – 15
71
CLAMP
SEG15 – 10
NC
SEG09 - 01
OSC2
OSC1
72 – 77
78 – 79
80 – 88
89
LCD segment line 01 – 09
Crystal oscillator input connection
Crystal oscillator output connection
90
When pulled to V-, an auto back light configuration is allowed.
Configure a low level applied to BKLIT larger than 1 second, the
BKOUT will be active.
91
BKSEL
I
If BKLIT is back to high level, the BKOUT would be inactive.
92
93
94
95
96
97
98
99
100
CESEL
C+
C-
V-
V-
V+
V+
DGND
AGND
I
OL selection feature control pin.
O
O
P
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
Negative supply voltage. Connecting to battery negative terminal.
Negative supply voltage. Connecting to battery negative terminal.
P
P/O Output of on-chip DC-DC converter.
P/O Output of on-chip DC-DC converter.
G
G
Digital ground.
Analog ground.
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage
V+
Rating
-4V
V- -0.6 to V+ +0.6
V+ ≥ (AGND/DGND+0.5V)
AGND/DGND
AGND/DGND ≥ (V- -0.5V)
V- -0.6 to DGND +0.6
500mW
Digital Input
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
0℃ to 70℃
-25℃ to 125℃
Ver 2.9
4
10/06/25
ES51926
3000 Counts Smart DMM
Electrical Characteristics
TA=25℃, V- = -3V
Parameter
Power supply
Operating supply current
In Scan AC/DC mode
Symbol
V-
IDD Normal operation
ISS In sleep mode
REV 10MΩ input resistor
Test Condition
Min.
-3.5
—
Typ.
-3.0
2.5
0.6
—
Max
-2.5
—
Units
V
mA
2.5
µA
—
Voltage roll-over error
±0.1 %F.S1
—
Best case straight
—
—
Voltage nonlinearity
NLV
line
±0.1
%F.S
Input Leakage
-10
-2.4
-000
1
-2.3
000
10
-2.2
+000 counts
PA
V
Low battery flag voltage
Zero input reading
Peak to peak backplane
drive voltage
V- to AGND
10MΩ input resistor
-3.5V≤ V ≤-2.2V
3.0
3.15
1
3.3
V
Counter time base period
fOSC = 4MHZ
—
—
sec
Reference voltage and open circuit
voltage for 300Ω measurement
100KΩ resistor
VREF between VRH and
AGND
-1.33
-0.86
-1.23
-0.78
-1.13
-0.70
V
V
Open circuit voltage for Ω
measurement (except 300Ω)
Ω and Continuity
Mode
Between V- pin and
HOLD, RANGE,
SEL,FC1-3,FUA,
FA, VON, AON,
CLAMP, BKLIT,
MAXMIN
Internal pull-high to 0V
current
—
—
1.2
µA
HZ
AC frequency response at 6.000V
Range
±1%
40-400
400-2000
—
—
—
10
—
—
±5%
AC input response for scan mode
50000
Hz
AC/DC voltage scan mode
sensitivity@1kHz
AC/DC current scan mode
sensitivity@1kHz
VR1(10MΩ input
impedance)
ADP, IVSL and IVSH
300
8
450
10
600
12
mV
mV
pF
Parasitic capacitance
allowed in 3.000MΩ
range
—
—
RDC scan mode RES sensitivity
200
RDC scan mode DIODE sensitivity
RDC scan mode CAP sensitivity
Forward voltage
—
—
—
0.8
—
V
pF
400
Reference voltage temperature
coefficient
100KΩ resister
Between VRH
—
—
ppm/℃
TCRF
50
0℃<TA<70℃
—
—
—
-1.5
-5
-2.0
1.5
5
2.0
%F.S
counts
%F.S
3nF – 3.0µF
Capacitance measurement
accuracy
30µF ~ 30mF
—
-5
5
counts
Note:
1.Full Scale
Ver 2.9
5
10/06/25
ES51926
3000 Counts Smart DMM
Functional Description
1. Operation Modes
1.1 Voltage Measurement
A re-configurable 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
300.0mV*
3.000V**
30.00V
Divider Ratio
1
Resister Connection
VR1 (10MΩ)
VR2 (1.111MΩ)
VR3 (101KΩ)
VR4 (10KΩ)
VR2
VR3
VR4
VR5
1/10
1/100
1/1000
1/10000
300.0V
1000V***
VR5 (1KΩ)
Note:
* Exists in manual mode only by RANGE key control
**This range is the default range for auto range & auto scan mode
*** Depends on CESEL selection
1.1.1 OL selection
ES51926 has a OL display selection feature archived by configuring a CESEL
pin. If pin CESEL is connected to V-, ES51926 will have a 600.0V overflow
level in DCV and ACV mode. If pin CESEL is connected to DGND, the
ES51926 will have a 1010V overflow level in DCV mode and have a 1010V
overflow level in ACV mode also. When CE is floating, a 1500V overflow level
in DCV mode but ACV is still 1010V overflow level. The meter will Show OL
when the measuring signal reaches the overflow level with beeper warning. The
configuration of CESEL is listed below.
CESEL
V-
DGND
Floating
DCV
600.0V
1010V
1500V
ACV
600.0V
1010V
1010V
Ver 2.9
6
10/06/25
ES51926
3000 Counts Smart DMM
1.1.2 HCF detection
ES51926 provides detection of high-crest-factor (HCF) signal in ACV auto range
mode. ES51926 senses the signal and determines it as HCF if the Vpp is large
enough. Once the signal is determined as HCF, ES51926 will jump up one
measuring range regardless of current measurement value. It takes 60ms to jump
one range up. The jumping up process will continue until the maximum range is
reached. With HCF detection, a more accurate result could be obtained. For
example, when a input signal with Vpp=200V, Vrms=40V(CF=5) was applied,
traditional DMM might stay at 30V range but shows counts with the amount of
error up to 10% or even bigger. The error rises from limited input/output swing
at internal ADC. With HCF detection, DMM will stay at 300V range and exhibits
more accurate results.
1.1.3 EF mode
ES51926 supports a non-contact ac voltage measurement, which is called electric
field measurement also. The EF mode is selected by SEL key when EF_EN is
active. The ADC input is configured from ADP pin vs. SGND. When no or less
electric field is detected, the LCD shows “EF”. If the detector senses electric
field, the strength will be showed on LCD by “-“ not digits type. Level 1(weak)
is “-“ and the level 4(strong) is “----“. Additional beeper will be output from
BUZOUT pin. The buzzer frequency depends on the strength of electric field also.
The Faster beeper means the stronger electric field (ac voltage) is sensed.
Ver 2.9
7
10/06/25
ES51926
3000 Counts Smart DMM
1.2 Current Measurement
1.2.1 For multi-meter application
ES51926 has 2 automatic and 1 manual current measurement modes for
multi-meter. The following table summarizes the full-scale range of each mode.
When ES51926 operates in the current measurement modes for multi-meter, it
takes high input from pin IVSH or IVSL, low input from pin SGND and
reference voltage from pin VR.
Mode
Automatic1
Full Scale
300.0µA / 3000µA
Input Terminal
IVSL/IVSH V.S. SGND
Full scale
150.0mV
150.0mV
150.0mV
Automatic2 30.00mA / 300.0mA IVSL/IVSH V.S. SGND
Manual 30.00A IVSH V.S. SGND
1.2.2 For clamp meter application
ES51926 has 2 automatic and 4 manual current measurement modes for Clamp
meter. The following table summarizes the full-scale range of each mode. When
ES51926 operate in the automatic mode1&2, it takes high input from
IVSH/IVSL (higher range/lower range), low input from SGND and reference
voltage from VR. When ES51926 operate in the manual mode1~4, it takes high
input from ADP, low input from SGND and reference voltage from VA+ & VA-.
Mode
Automatic1
Automatic2
Manual1
Manual2
Manual3
Manual4
Full Scale
300.0A / 3000A
30.00A / 300.0A
3.000A
Input Terminal
IVSL/IVSH V.S. SGND
IVSL/IVSH V.S. SGND
ADP V.S. SGND
Full scale
300.0mV
300.0mV
300.0mV
300.0mV
300.0mV
300.0mV
30.00A
300.0A
3000A
ADP V.S. SGND
ADP V.S. SGND
ADP V.S. SGND
Ver 2.9
8
10/06/25
ES51926
3000 Counts Smart DMM
1.3 Resistance Measurement
A re-configurable divider automatically provides a suitable full-scale range in
resistance measurement mode. The following table summarizes the full-scale
ranges and the reference resistors in each configuration.
Configuration
OR1
Full Scale Range
300.0Ω*
Relative Resistor
OR1
Equivalent value
100Ω
OR2
3.000KΩ
VR5
1KΩ
OR3
30.00KΩ
VR4
10KΩ
OR4
300.0KΩ
100KΩ
VR3∥VR1
OR5
OR6
3.000MΩ
30.00MΩ**
1MΩ
10MΩ
VR2∥VR1
VR1
Note: * When auto scan mode is set, continuity check is implemented in this range
** When auto scan mode is set, the 30.00MΩ range is omitted
1.3.1 Continuity check
Continuity check shares the same configuration with 300.0Ω manual resistance
measurement mode and has buzzer output to indicate continuity. The buzzer
generates 2KHz beep whenever the reading is less than 30Ω.
1.4 Diode Measurement
Diode measurement mode shares the same configuration with 3.000V manual
voltage measurement mode and has buzzer output to indicate continuity. The
buzzer generates a 2KHz sound whenever the reading is less than 30mV. If the
test circuit is open or the voltage drop between the two ports of the device (diode)
under test is larger than 2V, the LCD panel will show “OL”.
Ver 2.9
9
10/06/25
ES51926
3000 Counts Smart DMM
1.5 Capacitance Measurement
The following table summarizes the eight ranges of capacitance measurement
mode:
Configuration Full Scale Range
Relative Resistor
20kΩVR+100kΩ
20kΩVR+100kΩ
101kΩ
C1
C2
C3
C4
C5
C6
C7
C8
3.000nF
30.00nF
300.0nF
3.000uF
30.00uF
300.0uF
3.000mF*
30.00mF**
10kΩ
R9K / R1K
R9K / R1K
R9K / R1K
R9K / R1K
Note: * & ** The C7-C8 both range is not available for auto scan mode
In order to obtain an accurate reading, a capacitor must be discharged before
measurement begins. The chip has a built-in discharge mode to automatically
discharge the capacitor. In discharge mode, the LCD displays “dIS.C”
Discharging through the chip is quite slow. We recommend users to discharge the
capacitor with some other apparatus.
1.6 Auto power off mode (APO)
1.6.1 Idle Time selection
ES51926 has a default auto power off function. If the meter is idle for more than
the given Idle Time, the chip automatically turns the power off. The idle time to
trigger the auto power off function is determined by pin ‘APOSEL’. If pin
APOSEL is connected to V-, the Idle Time will be set to 3 minutes. If pin
APOSEL is connected to DGND or floating, the Idle Time will be set to 10
minutes. When APO happens, the state of the meter is saved. If the APO is
necessary to be cancelled, power on the ES51926 when any of the push key,
except for HOLD, is pressed down simultaneously.
Ver 2.9
10
10/06/25
ES51926
3000 Counts Smart DMM
1.6.2 Sleep output
The meter enters sleep mode after auto power-off or push SEL key to last for 2s.
The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V)
after re-power on.
1.6.3 Re-power on
After auto power-off is active, pushing any of the push function or changing the
measurement function can turn on the meter again. If the meter is re-powered on
by changing measurement function, the saved state is cleared. If the meter is
re-powered on by push functions, the chip restores the saved state and enters
HOLD mode. The LCD displays the saved value except for the auto scan mode.
Ver 2.9
11
10/06/25
ES51926
3000 Counts Smart DMM
2. Functional Modes Table
Measurement mode depends on the logic level of FC1, FC2, FC3, FUA, FA,
VON, AON and CLAMP.
FC1 FC2 FC3 FUA FA VON AON CLAMP
Functional Mode(pushing SEL key)
VAUTOÆVACÆVDCÆEF*ÆVAUTOÆ…
IAUTOÆIACÆIDCÆIAUTOÆ…(uA)
IAUTOÆIACÆIDCÆIAUTOÆ…(mA)
IAUTOÆIACÆIDCÆIAUTOÆ…(A)
VAUTOÆVACÆVDCÆVAUTOÆ…
IAC(300.0A/3000A)
Input
VR1,ADP
IVSH/IVSL
IVSH/IVSL
IVSH
1
1
1
1
1
1
1
0
0
0
1
1
X
X
X
X
X
X
X
1
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
X
1
0
0
X
1
X
0
0
1
X
0
X
X
X
X
1
0
0
X
0
0
0
1
1
0
0
0
0
1
1
1
X
1
1
1
1
1
X
X
X
X
X
X
X
X
VR1
IVSH/IVSL
IVSH/IVSL
VR1
0
0
IAC(30.00A/300.0A)
X
X
X
X
X
X
X
X
X
X
RDCAUTOÆRÆDÆCÆRDCAUTOÆ…
IAUTOÆIACÆIDCÆIAUTOÆ…(3.000A)
IAUTOÆIACÆIDCÆIAUTOÆ…(30.00A)
IAUTOÆIACÆIDCÆIAUTOÆ…(300.0A)
IAUTOÆIACÆIDCÆIAUTOÆ…(3000A)
ADP
ADP
ADP
ADP
0
0
Note: * EF mode could be selected when EF_EN is active.
3. Push Function
All the enabled push functions will be reset when the measurement mode is
changed by external switch. Change measurement mode by SEL function will
reset enabled RANGE, HOLD, MAX/MIN, and VAHz functions. The following
table lists the available function versus every measurement mode.
SEL
O
O
O
O
O
O
O
O
O
O
O
O
RANGE
HOLD MAX/MIN
VAHz
O
O
O
X
O
O
O
X
X
X
X
X
BKLIT
O
VSCAN
VAC
VDC
EF
ISCAN
X
O
O
X
X
O*
O*
X
O
X
X
O
O
X
X
O
O
X
O
O
O
O
X
O
O
X
X
O
O
X
O
O
O
O
O
O
O
O
O
O
O
O
IAC
IDC
RDCSCAN
Resistance
Continuity
Diode
O
O
O
X
O
Capacitance
Note: For ADP input, RANGE is not available
Ver 2.9
12
10/06/25
ES51926
3000 Counts Smart DMM
3.1 Select function
When power on or SEL key is pressed longer than one second, ES51926 will be
power-on reset to auto scan mode, which scanning mode is determined by
[FC1-FC3] function set. In auto scan mode, the ES51926 automatically selects
the appropriate measurement mode and range. Pushing the SEL key less than one
second could select the target measurement function. Pushing the key larger than
two seconds, the ES51926 will enter power down mode. If power down mode is
entered, only press SEL key to last for one second or apply the power to V-
terminal could re-power on the ES51926. The following figure shows the state
transition.
Push SEL key < 1s
V/A
AC mode
DC mode
EF* mode
ac/dc auto scan
measurement
measurement
measurement
Push SEL key > 1s
Power on reset
Push SEL key > 2s Æ enter power down mode
R/D/C
auto scan
Resistance
measurement
Continuity
measurement
Diode
measurement
Capacitance
measurement
Push SEL key < 1s
Note: * Available when EF_EN is active only
Ver 2.9
13
10/06/25
ES51926
3000 Counts Smart DMM
3.2 Range function
RANGE pin switches to and from automatic and manual mode, and while in
manual mode, changes the full-scale range. The following figure shows the state
transition.
1 push < 1 sec
Automatic
Mode
Manual
Mode
1 push > 1 sec
Range up
1 push < 1 sec
3.3 Hold and delay-hold function
The data hold mode makes the meter stop updating the LCD panel. This mode
can be nested in most of the special modes. In auto scanning mode, the HOLD
key is not available. Enabling hold function in automatic mode makes the meter
switch to manual mode. Hold function can be cancelled by changing the
measurement mode, pressing RANGE, or push HOLD again.
The delay-hold function is enabled when HOLD key is pressed larger than 2
seconds. When delay-hold function is entered successfully, the meter will stop to
update the LCD data after six seconds delayed. During the six seconds waiting,
the HOLD symbol on LCD panel will be blinking.
Push > 2s
Push < 2s
Push < 2s
Normal mode
(Auto/Manual)
HOLD mode
(Manual)
6sec past
Delay State
Push > 2s
Push < 2s
(Auto/Manual)
Ver 2.9
14
10/06/25
ES51926
3000 Counts Smart DMM
3.4 Max/Min + Hold function
The meter displays the maximum or minimum value of the input in Max/Min
mode. When MAX/MIN is pressed for the first time, the meter displays the
maximum value. The meter displays the minimum value, when it is pressed again.
When MAX/MIN is pressed for the third time, the meter displays current value.
The meter returns to normal operation if MAX/MIN is pressed and held for longer
than one second. Pressing HOLD key in Max/Min mode makes the meter stop
updating the maximum or the minimum value.
1 push<1s
Original state
(Automatic/manual)
1 push>1 sec
1 push>1s
1 push>1 sec
1push<1s
1push<1s
“MIN” active
min value
“Max” “MIN” blink
current value
“MAX” active
max value
1push<1s
Push HOLD
Push HOLD
Push HOLD
“MAX”“MIN” “H” blink
hold current value.
“MIN” “H” active
hold min value.
“MAX” “H” active
hold max value.
1push<1s
1push<1s
1push<1s
3.5 VAHz function
When voltage or current measurement mode is selected, the VAHz funtion is
available. Push VAHz key to select this frequency measurement mode. The
frequency is measured by auto ranging. The maximum frequency range is
100kHz. The sensitivity of signal input is 10% full scale of voltage or current
mode typically.
Configuration
Range
FR1
FR2
FR3
3.000KHz
30.00KHz
100.0KHz
Ver 2.9
15
10/06/25
ES51926
3000 Counts Smart DMM
3.6 Back light function
When BKSEL is set to DGND or floating, push the BKLIT key to enable the back
light output driving ON/OFF. If the auto back light configuration is active, the
BKLIT becomes a control input for external light sensed circuit. Set to low for one
second to active the back light output driving. Set to high then the driving output is
inactive immediately.
BKSEL
DGND or floating
V-
Configuration
Normal back light function
Auto back light function
4. Miscellaneous
The conditions, which the meter turns on the buzzer, include:
(1) Changing measurement mode generates one beep.
(2) Pressing any of the push functions generates one beep, if the function is valid.
(3) Power on and re-power on generate one beep.
(4) Input overflow in voltage and current mode generates one beep every 0.3
seconds (or 3.33 beeps per second.)
(5) Continuity (diode) check generates a continuous 2KHz beep whenever the
measurement is less then 30Ω(30mV)
(6) Auto power off or power down by SEL key generates a 2KHz beeper that lasts
for 1.5 seconds.
The following figures show the output waveform from the BUZOUT pin.
0.5 mS
(a) Continuous 2KHz beep
0.15 sec
0.3 sec
(b) 3.33 beep/sec
Ver 2.9
16
10/06/25
ES51926
3000 Counts Smart DMM
4.1 LCD configuration
S14 S12
S1
S2 S3 S4 S5 S6
S7 S8 S9 S10 S11
S15
S13
APO
MANU
MAX MIN
SCAN AUTO
HOLD
BP1
BP2
µ m
2V A
2
AC
1 F
µ m
1
n
BP3
BP4
DC
M K Ω Hz
BATT
SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09
BP1 SCAN AUTO
A4 MANU A3
HOLD
B3
APO
A2
BP2
BP3
AC
DC
F4
E4
D4
B4
G4
C4
F3
E3
D3
F2
E2
B2
C2
-
G3
G2
BP4 BATT DP3
C3
DP2
D2
DP1
SEG10 SEG11 SEG12 SEG13 SEG14 SEG15
BP1
BP2
BP3
BP4
A1
F1
E1
D1
µ2
m2
V
M
K
Ω
n
µ1
m1
F
MAX
MIN
B1
G1
C1
A
Hz
Ver 2.9
17
10/06/25
ES51926
3000 Counts Smart DMM
LCD Backplane Waveform
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
V- +3.2
V-
4.2 LCD display on condition
LCD annunciates
Condition
V
A
Ω
F
In voltage measurement mode, and diode measurement mode.
In current measurement mode.
In resistance measurement mode, and continuity mode.
In capacitance measurement mode.
In continuity check mode.
In diode mode.
Hz
DC
In VAHZ frequency mode.
In DC voltage or DC current mode.
AC
In AC voltage or AC current mode.
SCAN
AUTO
MANU
When auto scan mode is selected
When automatic full scale range selection is enabled.
In manual mode.
When the reading is exceeding 30V in DCV or ACV, the DNAGER symbol will be
displayed on
When HOLD function is enabled. When delay-hold is selected, the HOLD symbol
will be blinking for 6 seconds.
HOLD
Max / Min
m1
When Max or Min function is enabled.
In capacitor measurement mode and the full scale range is in the order of mF.
In capacitor measurement mode and the full scale range is in the order of uF.
µ1
n
m2
In capacitor measurement mode and the full scale range is in the order of nF.
In voltage or current measurement mode and the full scale range is in the order of 10-3.
In current measurement mode and the full scale range id in the order of uA.
µ2
M
K
In resistance measurement mode and the full scale range is in the order of MΩ
In resistance measurement mode and the full scale range is in the order of KΩ
When auto power off function is enabled.
APO
Ver 2.9
18
10/06/25
ES51926
3000 Counts Smart DMM
Test Circuit
1. Voltage test
4. Current test
AGND
OVSG
AGND
100
1K
OR1
VR5
VR4
VR3
VR2
SGND
0.005
0.495
30A
10K
101K
1.111M
mA
ADO
4.5
D2
D1
mA
uA
uA
ADI
100K
100K
50
A
+1.0u
15K
ACVL
ACVH
TEST5
mA
uA
IVSH
IVSL
15K
10K
450
V
R
1
V
R
+4.7u
10K
5. Diode test
10M
-400mV
AGND
OVH
100
Voltage input
Z1
6V
Z2
PTC
1.5K
2. Resistance test
VR1
OVX
10M
22n
OHMC4
220n
VR2
OHMC3
OHMC2
OHMC1
1.111M
470n
47n
PTC
1.5K
OVSG
OVH
100
6. Low battery
Z1
6V
Z2
OVSG
100
OR1
VR5
VR4
VR3
VR2
1K
9V
10K
101K
1.111M
680K
BA
TT
LBAT9
SGND
AGND
0.1u
AGND
V-
270K
0V
3. Current test for clampmeter
7. EF test
100k
ADP
EFin+
EFin-
60M
VR
100K
SGND
AGND
ADP
RL
R
SGND
AGND
VA+
VA-
400mV
Ver 2.9
19
10/06/25
ES51926
3000 Counts Smart DMM
Application Circuit
a.) AC average rectified circuit
1
2
3
4
5
6
V-
BT1
ZR3
3V
5.6V
uA
SW2
SW1
D
C
B
A
D
C
B
A
LCD Panel
C3
C4
10uF
ZR1
R1
ZR2
SW SPDT
0.1uF
450
J1
uA
SW3
ZR4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
BP1
C1
10uF
1
2
3
4
5
6
7
8
7.5V
C2
0.1uF
R2
45
mA
mA
60A
SW4
9
U1
10
11
12
13
14
15
16
17
18
19
R3
ZR5
ZR6
4.5
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
MZX/MIN
BKLIT
EFEN
BP1
AGND
SEG12
SEG13
SEG14
SEG15
CLAMP
VON
AON
FA
FUA
FC3
FC2
FC1
HOLD
SEL
VAHz
RANGE
MAX/MIN
BKLIT
EFEN
BP1
SW5
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
BP2
BP3
BP4
R4
0.495
R7
R8
R9
220K
75K
100K
100K
60A
CON19
SW6
1
1
IVSH
IVSL
100K
R10
J2
J4
R6
R5
R11
100
C6
ES51926
VR1
20K
R12
R13
R14
R15
R18
100
1K
10K
101K
1.11M
TEST5
ACVL
ACVH
ADI
Function Switch
0.005
Gnd
220pF
V -
V -
SW7
1.5K PTC
ZR8
R17
SW SPST
VR1_10M
SW14
BKLIT
SW8
CLAMP
VON
AON
FA
ZR7
BP2
BP3
BP4
ANNUNC
R / C / D / Cont.
BP2
BP3
BP4
ANNUNC
BKOUT
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_lock
SW15
1
ADO
MZX/MIN SW9
J3
SW_lock
SW16
RANGE
VAHZ
SEL
SW10
SW11
SW12
SW13
C11
22nF
C13
SW_lock
SW17
220nF
SW_lock
SW18
Average Circuit
C14
C15
470nF
47nF
FUA
FC3
SW_lock
SW19
HOLD
VR2
10K
R16
10K
TEST5
ADI
SW_lock
SW20
C10
4.7uF
APOSEL
BUZIN
SLEEP
FC2
C12
1uF
SW_lock
SW21
FC1
R21
15K
R22
15K
R23
27K VR3
10K
SW_lock
SW22
VR
R26
9K
EFEN
C17
1uF
D2
SW_lock
V -
D1
ACVH
ADO
C18
ZR9
5.6V
ADP
1N4148
IN4148
220nF
R25
1K
1
J5
BZ1
Buzzer
ACVL
Title
ES51926 3000 Counts Smart DMM
Size
B
Number
Revision
Application Circuit ( Average )
Date:
File:
30-Aug-2007
D:\Protel file\ES51928 Serial.ddb
Sheet of
Drawn By:
1
2
3
4
5
6
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 ES51926 on.
3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (3/30nF
range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.9
20
10/06/25
ES51926
3000 Counts Smart DMM
b.) AC RMS circuit
1
2
3
4
5
6
V-
BT1
ZR3
3V
5.6V
uA
SW2
SW1
LCD Panel
C3
C4
10uF
J1
ZR1
R1
ZR2
SW SPDT
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
MZX/MIN
BKLIT
EFEN
BP1
AGND
SEG12
SEG13
SEG14
SEG15
CLAMP
VON
AON
FA
FUA
FC3
FC2
FC1
HOLD
SEL
VAHz
RANGE
MAX/MIN
BKLIT
EFEN
BP1
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
220K
75K
100K
100K
60A
Function Switch
SW9
1
1
IVSH
IVSL
100K
J2
J3
R6
R5
R12
100
ES51926
V -
C6
VR1
20K
R13
R14
R15
R16
R17
100
1K
10K
101K
1.11M
0.005
Gnd
220pF
BKLIT
SW5
SW_non lock
SW10
1.5K PTC
ZR8
R7
MZX/MIN SW6
SW SPST
VR1_10M
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_non lock
ACVL
ACVH
ZR7
BP2
BP3
BP4
ANNUNC
RANGE
VAHZ
SEL
SW7
BP2
BP3
BP4
ANNUNC
BKOUT
ADO
R / C / D / Cont.
SW11
SW12
SW13
1
SW17
ACV / RMS
J4
C10
22nF
C12
SW_lock
220nF
HOLD
TRMS Circuit
C13
C14
470nF
47nF
-VS_ES7
+VS_ES7
VR2
500K
V -
ES7_PWR
R18
10K
APOSEL
BUZIN
SLEEP
SW14
CLAMP
1
2
3
4
8
7
6
5
C11
1uF
RL
Vin
COM
+ VS
SW_lock
SW15
ES7_PWR
ACVH
PwrDown Vout
- VS Cav
VON
AON
FA
R21
27K VR3
10K
VR
R24
9K
SW_lock
SW16
U2 ES7
C19
-VS_ES7 +VS_ES7
R19
150
R20
47K
2.2uF
+ C20
2.2uF
V -
SW_lock
SW18
C16
C17
+
C21
ZR9
5.6V
+
ADP
SW_lock
SW19
ADO
220nF
10uF
10uF
R26
C18
1uF
1
J5
FUA
FC3
VR4
50K
1K
BZ1
Buzzer
SW_lock
SW20
SW_lock
SW21
FC2
SW_lock
SW22
Title
FC1
ES51926 3000 Counts Smart DMM
SW_lock
SW23
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:
1
2
3
4
5
6
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 ES51926 on.
3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (3/30nF
range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.9
21
10/06/25
ES51926
3000 Counts Smart DMM
Package Information
7.1
100 Pin LQFP Package
7.2
Dimension Parameters
Ver 2.9
22
10/06/25
相关型号:
©2020 ICPDF网 联系我们和版权申明