SDM3065X
Digital Multimeter
Service Manual
SM06036-E02F

SDM3065X Service Manual IGuaranty and Declaration
Copyright
SIGLENT TECHNOLOGIES CO., LTD All Rights Reserved.

Trademark Information
SIGLENT is the registered trademark of SIGLENT TECHNOLOGIES CO.,LTD

Declaration⚫

SIGLENT products are protected by patent law in and outside of the P.R.C.

⚫

SIGLENT reserves the right to modify or change parts of or all the
specifications or pricing policies at company’s sole decision.

⚫

Information in this publication replaces all previously corresponding
material.

⚫

Any way of copying, extracting or translating the contents of this manual is
not allowed without the permission of SIGLENT.

⚫

SIGLENT will not be responsible for losses caused by either incidental orconsequential in connection with the furnishing, use or performance of thismanual as well as any information contained.

Product Certification
SIGLENT guarantees this product conforms to the national and industrial
standards in China as well as the ISO9001: 2015 standard and the ISO14001:
2015 standard. Other international standard conformance certification is inprogress.

General Safety Summary
Review the following safety precautions to avoid personal injuries and prevent
damages to this product or any products connected to it. To avoid potential
hazards, use this product only as specified.
Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injuries
Use Proper Power Cord. Use only the power cord specified for this productand approved by the local regulating body.
Avoid Electric Shock. To avoid injuries or losses of life, do not connect ordisconnect probes or test leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the protective terra
conductor of the power line. To avoid electric shock, the grounding conductor
must be connected to the earth. Make sure the instrument is grounded
correctly before connecting its input or output terminals.
Connect the Probe Properly. Do not connect the probe ground lead to a highvoltage since it has the isobaric electric potential as ground.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all
ratings and markers on the instrument and check your manual for more
information about ratings before connecting.
Use Proper Fuse. Use only the specified fuse.
Do Not Operate Without Covers. Do not operate this instrument with covers
or panels removed.
SDM3065X Service Manual III

Avoid Circuit or Wire Exposed. Do not touch exposed junctions andcomponents when the unit is powered.
Do Not Operate With Suspected Failures. If you suspect damage has
occurred to this instrument, have it inspected by qualified service personnel
before any further operation. Any maintenance, adjustment or replacement
especially to the circuits or accessories should be performed by SIGLENT
authorized personnel.
Keep Product Surfaces Clean and Dry.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not
operate the instrument in wet or damp conditions.
Do Not Operate in an Explosive Atmosphere. To avoid injuries or fire
hazards, do not operate in an explosive atmosphere.

Safety Terms and Symbols
Terms on the Product. These terms may appear on the product:
DANGER: Indicates an injury or hazard that may immediately happen.
WARNING: Indicates that there is potential for an injury or hazard.
CAUTION: Indicates damage to the instrument or other property may occur.
Symbols on the Product. These symbols may appear on the product:

Catalog
Guaranty and Declaration ............................................................................................................. II
General Safety Summary ............................................................................................................. III
General Features and Specifications .......................................................................................... 1
General Features.................................................................................................................... 1
Prepare Information ..................................................................................................................... 10
Functional check................................................................................................................... 10Power-on Inspection .................................................................................................... 10
Default Setup ................................................................................................................ 10
Self Test ......................................................................................................................... 11
Performance Verification ............................................................................................................. 12
Performance verification test items ................................................................................... 12
Recommended Test Equipment ......................................................................................... 12
Performance verification step ............................................................................................. 12
Test Considerations.............................................................................................................. 13
Zero Offset Verification ........................................................................................................ 13
DC Voltage and DC Current Gain Verification ................................................................. 14
Frequency Accuracy Verification ........................................................................................ 15
AC Voltage and AC Current Verification............................................................................ 15
Capacitance Verification ...................................................................................................... 16
Assembly Procedures .................................................................................................................. 17
Security Consideration ........................................................................................................ 17
Required Tools ...................................................................................................................... 17
Disassembly Procedures .................................................................................................... 18
Troubleshooting ............................................................................................................................ 22
ESD Precautions .................................................................................................................. 22
Required Equipment ............................................................................................................ 22
Analog Board Drawing ......................................................................................................... 23
Main Board Drawing ............................................................................................................ 24
Power Board Drawing .......................................................................................................... 24
Check the Power Supply ..................................................................................................... 25
Check the Analog Board...................................................................................................... 26
Voltage Check ............................................................................................................... 26
Analog board Clock Check ......................................................................................... 27
Check the Main Board ......................................................................................................... 27
Voltage Check ............................................................................................................... 27
Microprocessor Check ................................................................................................. 28
Quick Guide for General Failures ...................................................................................... 28
Maintenance.................................................................................................................................. 29
Maintenance Summary........................................................................................................ 29
Repackaging for Shipment.................................................................................................. 29
Contact SIGLENT......................................................................................................................... 30
SDM3065X Service Manual VGeneral Features and Specifications
SDM3065X is a multimeter designed with 6½ digit reading resolution anddual-display suited for any application requiring high-precision, multifunction,
and automated measurements. It features a combination of basic
measurement, multiple math, and display functions, etc.

General Features⚫

4.3 inch color TFT-LCD display screen with 480*272 high resolution⚫

Real 6½ digit reading resolution⚫

True-RMS AC Voltage and AC Current measurements⚫

1 Gb Nand Flash size, mass storage configuration and data files⚫

Built-in cold terminal compensation for accurate thermocouple readings⚫

Supports standard SCPI includes EasyDMM PC software for easy control
and data collection⚫

Supports dual-display function, Chinese and English menu⚫

Built-in help system, convenient to acquire information⚫

Supports standard communications buses: USB Device, USB Host, LAN(Optional Accessories: USB-GPIB adapter)⚫

SDM3065X-SC supports 12 voltage/4 current channel Scanner Card

SDM3065X Service Manual 1

Specifications

DC Characteristics
Accuracy ± (% of reading + % of range) [1]Function

Test

24Hour[3]90day

Current

TCAL℃ ±1℃

TCAL℃ ±5℃

1Year
TCAL℃ ±5℃

Temperature
coefficient
0℃to （ TCAL℃-5℃ ）（TCAL℃+5℃）to 50℃

0.0020+ 0.0015

0.0030 + 0.0020

0.0040 + 0.0023

0.0005 + 0.0003

2.000000 V

0.0015 + 0.0004

0.0020 + 0.0004

0.0035 + 0.0006

0.0005 + 0.0001

20.00000 V

0.0020 + 0.0003

0.0030 + 0.0004

0.0040 + 0.0004

0.0005 + 0.0001

200.0000 V

0.0020 + 0.0005

0.0040 + 0.0004

0.0050 + 0.0005

0.0005 + 0.0001

1000.000 V[4]0.0020 + 0.0005

0.0040 + 0.0008

0.0055 + 0.0008

0.0005 + 0.0001

0.009 + 0.010

0.040 + 0.005

0.050 + 0.005

0.0020 + 0.0026

0.007 + 0.001

0.030 + 0.001

0.050 + 0.002

0.0020 + 0.0001

0.006 + 0.008

0.030 + 0.005

0.050 + 0.005

0.0020 + 0.0015

0.009 + 0.001

0.030 + 0.001

0.050 + 0.002

0.0020 + 0.0001

Range [2]Or
BurdenVoltage200.0000mV
DC Voltage

200.0000 μA
2.000000
mA
20.00000
DC Current

mA
200.0000
mA

Resistance[6]

Continuity
Test< 0.07 V< 0.7 V< 0.12 V

0.045 + 0.015

0.080 + 0.005

0.100 + 0.012

0.0050 + 0.0008

10.00000 A[5]< 0.6 V

0.090 + 0.002

0.120 + 0.005

0.150 + 0.005

0.0050 + 0.0018

200.0000 Ω

1 mA

0.0030 + 0.0031

0.008 + 0.005

0.010 + 0.004

0.0006 + 0.0006

2.000000 kΩ

1 mA

0.0020 + 0.0005

0.008 + 0.001

0.010 + 0.001

0.0006 + 0.0001

20.00000 kΩ

100 μA

0.0020 + 0.0005

0.008 + 0.001

0.010 + 0.001

0.0006 + 0.0001

200.0000 kΩ

10 μA

0.0020 + 0.0005

0.008 + 0.001

0.010 + 0.001

0.0006 + 0.0001

0.0020+ 0.0010

0.010 + 0.001

0.012 + 0.001

0.0010 + 0.0002

0.015 + 0.001

0.030 + 0.001

0.040 + 0.001

0.0030 + 0.0005

0.300 + 0.010

0.800 + 0.010

0.800 + 0.010

0.1500 + 0.0002

1.000000
MΩ
MΩ

[7]

< 0.25 V

2.000000 A

10.00000

Diode Test

< 0.03 V

2 μA

200 nA

100.0000

200 nA ||

MΩ

10 MΩ

0～2 V

1 mA

0.002 + 0.009

0.008 + 0.020

0.010 + 0.020

0.0010 + 0.0020

2～4 V

1 mA

0.002 + 0.010

0.008 + 0.020

0.010 + 0.020

0.0010 + 0.0020

2000.0 Ω

1 mA

0.002 + 0.010

0.008 + 0.020

0.010 + 0.020

0.0010 + 0.0020

Remarks:[1] Specifications are for 90-minute warm-up and 100 NPLC integration time. For integration time<100NPLC, add the appropriate “RMS Noise Adder” listed in the following table.
[2] 10% over range on all ranges except DCV 1000 V and DCI 10 A range.
[3] Relative to calibration standards.
[4] For each additional volt over ± 500 V, add 0.03 mV error.
[5] For continuous current > 7A DC or 7A AC RMS, 30 seconds ON and 30 seconds OFF.
[6] Specifications are for 4–wire resistance measurement or 2–wire resistance measurement using REL
operation. Without REL operation, add 0.2 Ω additional error in 2-wire resistance measurement.
[7] Accuracy specifications for the voltage measured at the input terminal only. 1 mA test current is typical.
Variation in the current source will create some variation in the voltage drop across a diode junction.
Adjustable voltage range ：0～4 V.

Performance Versus Integration Time – 50 Hz (60 Hz) Power-line Frequency
Integration Time
NumberResolution [1]of(ppm Range)

NMRR

Readings/s [3]

RMS Noise Adder [4] (% of Range)

[2]

（dB）

50 Hz

60 Hz

DCV 20 V

DCV 2 V 200

Power line

V

Cycles[5]（NPLC）

ResistanceDCV 1000 V

DCV 200 mV

DCI

Resistance

2 mA

200 Ω

200 mA2 kΩ 20 kΩ

1000

1000

0

0

0

1000

1

0

1

0.22

10
100

DCI 10 A

0.00060.00080.00150.00401000

0.00040.00050.00080.0025100

100

0.00030.00030.00060.0025

60

50

60

0

0.00010.00020.0005

0.08

60

5

6

0

0

0

0.0002

0.035

60

0.5

0.6

0

0

0

0

0.005(0.006)

2.7

00.05 (0.06)

1.6

0.5 (0.6)

Remarks:[1] Typical value. Resolution is defined as the typical 20 V range RMS noise.
[2] Normal mode rejection ratio for power-line frequency ± 0.1%. For power-line frequency ± 1%, subtract
20 dB. For ± 3%, subtract 30 dB.
[3] Maximum rate for DCV, DCI, 2-wire resistance and 4-wire resistance functions.
[4] The basic DC accuracy specifications include RMS noise at 100 NPLC. For <100 NPLC, add “RMS
Noise Adder” to the basic DC accuracy specifications.
[5] When Power Supply of frequency is 60 Hz, the cycles is 0.006, 0.06, 0.6,1,10,100 NPLC.

SFDR & SINAD[1]Function

DCV

DCI

Range

Spurious-Free
Dynamic Range (SFDR)

Signal-to-Noise-and-Distortion(SINAD)

200 mV

80

75

2V

76

80

20 V

78

72

200 V

80

78

1000 V82

80

200 uA90

70

SDM3065X Service Manual 3

2 mA

90

80

20 mA

85

70

200 mA

80

75

2A

70

60

[1] Typical value. -1 dBFS, 1 kHz single tone. 100 us aperture time and auto zero off.

AC Characteristics
Accuracy ± (% of reading + % of range) [1]Function

Range [2]Frequency
Range

24
Hour[3]90 DayTCAL℃ ±5℃

TCAL℃

1 YearTCAL℃ ±5℃

Temperature
coefficient
0℃

to（ TCAL℃-5℃ ）±1℃（ TCAL℃+5℃ ） to50℃
3 Hz- 5 Hz

1.00 + 0.03

1.00 + 0.04

1.00 + 0.04

0.100 + 0.004

5 Hz-10 Hz

0.35 + 0.03

0.35 + 0.04

0.35 + 0.04

0.035 + 0.005

10 Hz-20 kHz

0.04 + 0.03

0.05 + 0.04

0.06 + 0.04

0.005 + 0.004

20 kHz-50 kHz

0.10 + 0.05

0.11 + 0.05

0.12 + 0.05

0.011 + 0.005

50 kHz-100 kHz

0.55 + 0.08

0.60 + 0.08

0.60 + 0.08

0.060 + 0.008

100 kHz- 300 kHz

4.00 + 0.50

4.00 + 0.50

4.00 + 0.50

0.20 + 0.02

3 Hz- 5 Hz

1.00 + 0.02

1.00 + 0.03

1.00 + 0.03

0.100 + 0.003

5 Hz-10 Hz

0.35 + 0.02

0.35 + 0.03

0.35 + 0.03

0.035 + 0.003

10 Hz-20 kHz

0.04 + 0.02

0.05 + 0.03

0.06 + 0.03

0.005 + 0.003

20 kHz-50 kHz

0.10 + 0.04

0.11 + 0.05

0.12 + 0.05

0.011 + 0.005

50 kHz-100 kHz

0.55 + 0.08

0.60 + 0.08

0.60 + 0.08

0.060 + 0.008

True-RMS
AC

100 kHz- 300 kHz

4.00 + 0.50

4.00 + 0.50

4.00 + 0.50

0.20 + 0.02

3 Hz- 5 Hz

1.00 + 0.03

1.00 + 0.04

1.00 + 0.04

0.100 + 0.004

Voltage [4]5 Hz-10 Hz

0.35 + 0.03

0.35 + 0.04

0.35 + 0.04

0.035 + 0.004

10 Hz-20 kHz

0.04 + 0.04

0.07 + 0.04

0.08 + 0.04

0.008 + 0.004

20 kHz-50 kHz

0.10 + 0.05

0.12+ 0.05

0.15 + 0.05

0.012 + 0.005

50 kHz-100 kHz

0.55 + 0.08

0.60 + 0.08

0.60 + 0.08

0.060 + 0.008

100 kHz- 300 kHz

4.00 + 0.50

4.00 + 0.50

4.00 + 0.50

0.20 + 0.02

3 Hz- 5 Hz

1.00 + 0.02

1.00 + 0.03

1.00 + 0.03

0.100 + 0.003

5 Hz-10 Hz

0.35 + 0.02

0.35 + 0.03

0.35 + 0.03

0.035 + 0.003

10 Hz-20 kHz

0.04 + 0.02

0.07 + 0.03

0.08 + 0.03

0.008 + 0.003

20 kHz-50 kHz

0.10 + 0.04

0.12+ 0.05

0.15 + 0.05

0.012 + 0.005

50 kHz-100 kHz

0.55 + 0.08

0.60 + 0.08

0.60 + 0.08

0.060 + 0.008

100 kHz- 300 kHz

4.00 + 0.50

4.00 + 0.50

4.00 + 0.50

0.20 + 0.02

3 Hz- 5 Hz

1.00 + 0.02

1.00 + 0.03

1.00 + 0.03

0.100 + 0.003

200.0000 mV

2.000000 V

20.00000 V

200.0000 V

750.0000 V[5]

Function

Range [2]5 Hz-10 Hz

0.35 + 0.02

0.35 + 0.03

0.35 + 0.03

0.035 + 0.003

10 Hz-20 kHz

0.04 + 0.02

0.07 + 0.03

0.08 + 0.03

0.008 + 0.003

20 kHz-50 kHz

0.10 + 0.04

0.12+ 0.05

0.15 + 0.05

0.012 + 0.005

50 kHz-100 kHz

0.55 + 0.08

0.60 + 0.08

0.60 + 0.08

0.060 + 0.008

100 kHz- 300 kHz

4.00 + 0.50

4.00 + 0.50

4.00 + 0.50

0.20 + 0.02

24 Hour[3]TCAL℃ ±1℃

90 DayTCAL℃ ±5℃

Frequency
Range

1Year
TCAL℃ ±5℃

Temperature
coefficient
0℃to（TCAL℃-5℃）） TCAL℃+5℃ ） to50℃

3 Hz- 5 Hz

1.10 + 0.06

1.10 + 0.06

1.10 + 0.06

0.200 + 0.005

5 Hz-10 Hz

0.35 + 0.06

0.35 + 0.06

0.35 + 0.06

0.100 + 0.005

10 Hz-5 kHz

0.15 + 0.06

0.15 + 0.06

0.15 + 0.06

0.015 + 0.005

5 kHz-10 kHz

0.35 + 0.70

0.35 + 0.70

0.35 + 0.70

0.030 + 0.005

3 Hz- 5 Hz

1.00 + 0.04

1.00 + 0.04

1.00 + 0.04

0.100 + 0.005

5 Hz-10 Hz

0.30 + 0.04

0.30 + 0.04

0.30 + 0.04

0.035 + 0.005

10 Hz-5 kHz

0.12 + 0.04

0.12 + 0.04

0.12 + 0.04

0.015 + 0.005

5 kHz-10 kHz

0.20 + 0.25

0.20 + 0.25

0.20 + 0.25

0.030 + 0.005

3 Hz- 5 Hz

1.10 + 0.06

1.10 + 0.06

1.10 + 0.06

0.200 + 0.005

5 Hz-10 Hz

0.35 + 0.06

0.35 + 0.06

0.35 + 0.06

0.100 + 0.005

10 Hz-5 kHz

0.15 + 0.06

0.15 + 0.06

0.15 + 0.06

0.015 + 0.005

5 kHz-10 kHz

0.35 + 0.70

0.35 + 0.70

0.35 + 0.70

0.030 + 0.005

3 Hz- 5 Hz

1.00 + 0.04

1.00 + 0.04

1.00 + 0.04

0.100 + 0.006

5 Hz-10 Hz

0.30 + 0.04

0.30 + 0.04

0.30 + 0.04

0.035 + 0.006

10 Hz-5 kHz

0.10 + 0.04

0.10 + 0.04

0.10 + 0.04

0.015 + 0.006

5 kHz-10 kHz

0.20 + 0.25

0.20 + 0.25

0.20 + 0.25

0.030 + 0.006

3 Hz- 5 Hz

1.10 + 0.06

1.10 + 0.06

1.10 + 0.06

0.100 + 0.006

5 Hz-10 Hz

0.35 + 0.06

0.35 + 0.06

0.35 + 0.06

0.035 + 0.006

10 Hz-5 kHz

0.15 + 0.06

0.15 + 0.06

0.15 + 0.06

0.015 + 0.006

5 kHz-10 kHz

0.35 + 0.70

0.35 + 0.70

0.35 + 0.70

0.030 + 0.006

10.00000

3 Hz- 5 Hz

1.10 + 0.08

1.10 + 0.10

1.10 + 0.10

0.100 + 0.008[6]

5 Hz-10 Hz

0.35 + 0.08

0.35 + 0.10

0.35 + 0.10

0.035 + 0.008

10 Hz-5 kHz

0.15 + 0.08

0.15 + 0.10

0.15 + 0.10

0.015 + 0.008

200.0000 uA

2.000000 mA

True-RMSAC
Current [8]20.00000 mA

200.0000 mA

2.000000 A

A

SDM3065X Service Manual 5Additional Low Frequency Errors (% of reading)

Additional Crest Factor Errors (non-sine wave)

AC Filter

Frequency＞3 Hz＞20 Hz＞200 Hz

Crest Factor

Error (% of reading)

10 Hz-20 Hz

0

0.74

--

1-2

0.05

20 Hz-40 Hz

0

0.22

--

2-3

0.2

40 Hz-100 Hz

0

0.06

0.73

3-4

0.4

0.01

0.22

100 Hz- 200Hz

0200 Hz-1 kHz

0

0

0.18

＞1 kHz

0

0

0

[7]

0.5

4-5

Remarks:[1] Specifications are for 90-minute warm-up, ＞ 3Hz ac filter and sine wave input.
[2] 10% over range on all ranges except ACV 750 V and ACI 10 A ranges.
[3] Relative to calibration standards.
[4] Specifications are for sine wave input >5% of range. For inputs within 1% and 5% of range and <50 kHz, add
0.1% of range additional error. For 50 kHz to 100 kHz, add 0.13% of range additional error.
[5] ACV 750 range limited to 8x107 Volt-Hz. For input over 300 V rms, add 0.7 mV error for each additional volt.
[6] For continuous current > DC 7 A or AC RMS 7 A, 30 seconds ON and 30 seconds OFF.
[7] For frequency below 100 Hz, the specification of slow filter is only for sine wave input.
[8] Specifications are for sine wave input >5% of range. For inputs within 1% to 5% of range, add 0.1% of range additional
error. Specifications are typical values for 200 uA and 2 mA, 2 A and 10 A ranges when frequency >1 kHz.

Frequency and Period Characteristics
Accuracy ±（% of Reading）[1] [2]Function

Range

FrequencyRange

24 Hour[3]TCAL℃ ±1℃

90 DayTCAL℃ ±5℃

1 YearTCAL℃ ±5℃

Temperature
coefficient
0℃to （ TCAL℃-5℃ ）（ TCAL℃+5℃ ） to50℃

3 Hz – 5Hz

0.07

0.07

0.07

0.005

5 Hz – 10 Hz

0.04

0.04

0.04

0.005

10 Hz – 40

0.02

0.02

0.02

0.001

0.005

0.006

0.007

0.001

0.005

0.006

0.007

0.001

Frequency,

200 mV to

Hz

Period750 V

40 Hz –300
KHz
300 KHz – 1
MHz

Frequency

Gate Time (Resolution)
1s (0.1 ppm)

0.1 s (1 ppm)

0.01 s (10 ppm)

0.001 s (100 ppm)

3 Hz– 5Hz

0

0.12

0.12

0.12

5 Hz– 10 Hz

0

0.17

0.17

0.17

10 Hz–40 Hz

0

0.20

0.20

0.20

40 Hz–100 Hz

0

0.06

0.21

0.21

100 Hz–300 Hz

0

0.03

0.21

0.21

300 Hz–1 kHz

0

0.01

0.07

0.07

＞1 kHz

0

0

0.02

0.02

Remarks:[1] Specifications are for 90 minutes warm-up, using 1 s gate time.
[2] For frequency ≤ 300 kHz, the specification is the 10% to 110% of range of the AC input voltage. For frequency >300 kHz, the specification is the 20% to 110% of range of the AC input voltage. The maximum input is limited to
750 V rms or 8 ×107 Volts-Hz (whichever is less). The 200 mV range is full range input or input that is larger than
the full range. For 20 mV to 200 mV, multiply % of reading error ×10.
[3] Relative to calibration standards.

Capacitance Characteristics
Accuracy±（% of Reading + % of Range）[1]Temperature
Function

Range [2]Test Current

1 YearTCAL℃±5℃

coefficient
0℃ to（TCAL℃ - 5℃）（TCAL℃ + 5℃）to50℃

Capacitance

2.0000 nF

10 μA

2 + 2.4

0.05 + 0.06

20.000 nF

10 μA

1 + 0.1

0.05 + 0.01

200.00 nF

100 μA

1 + 0.1

0.01 + 0.01

2.0000 μF

100 μA

1 + 0.1

0.01 + 0.01

20.000 μF

1mA

1 + 0.1

0.01 + 0.01

200.00 μF

1mA

1 + 0.1

0.01 + 0.01

2.0000 mF

1mA

1 + 0.1

0.01 + 0.01

20.000 mF

1mA

1 + 0.1

0.01 + 0.01

100.00 mF

1mA

3 + 0.1

0.05 + 0.02

Remarks:[1] Specifications are for 90 minutes warm–up and using REL operation. Additional errors may becaused by
non–film capacitors.
[2] Specifications are the 1% to 110% of range on 2nF range and 10% to 110% of range on all otherranges

SDM3065X Service Manual 7

Temperature Characteristic
Accuracy ±（% of Reading）[1]Temperature
Type
Function

Optimum

Probe TypeRange

1 Yearcoefficient

TCAL℃±50℃ to（TCAL℃ - 5℃）℃（TCAL℃ + 5℃）to50℃

α=0.00385

RTD[2](R0 is 49Ω to 2.1

0.16℃

0.01℃

-200℃~660℃kΩ)B

0℃～1820℃

0.76℃

0.14℃

E

-270℃～

0.5℃

0.02℃

0.5℃

0.02℃

0.5℃

0.03℃

0.5℃

0.04℃

0.5℃

0.09℃

0.6℃

0.11℃

0.5℃

0.03℃

1000℃
J

-210℃～
1200℃

K

Temperature-270℃～
1370℃

Thermocouple [3]N-270℃～
1300℃

R-270℃～
1760℃

S-270℃～
1760℃

T-270℃～
400℃

Remarks:[1] Specifications are for 90 minutes warm-up. Exclusive of sensor error.
[2] Specification is for 4WR sensor measurement or 2WR measurement using REL operation.
[3] Relative to cold junction temperature, accuracy is based on ITS-90. Built-in cold junction temperaturerefers to the temperature inside the banana jack and its accuracy is ± 2.5 ℃.

Measurement Rate
Function

Setting

Integration

Readings/s 50Hz（60Hz）

0.005（0.006） NPLC

100(100) us

10000 (10000)

DC Voltage

0.05（0.06） NPLC

1 (1) ms

1000 (1000)

DC Current

0.5（0.5） NPLC

4 (4) ms

100 (100)

2 - wire Resistance

1 NPLC20(16.7) ms

50 (60)4 - wire Resistance

10 NPLC

200(167) ms

5 (6)100 NPLC

2(1.67) s

0.5 (0.6)

3 Hz
AC Voltage

20 Hz

AC Filter

0.52

AC Current

200 Hz50

1 s Gate time1

Frequency and

0.1 s

10

Period [1]0.01 s1000.001 s500

100 mF Range

0.5

Capacitance[2][1] 20 V range, 1 kHz input.
[2] The measurement period changes with the capacitance under test.

SDM3065X Service Manual 9Prepare Information
Before doing performance verifying or procedure adjusting, you should masterthe following operations to make the multimeter work in a good state or deal
with some simple functional problems. The following contents are included inthis chapter:⚫

How to perform functional checks⚫

How to use self-test routine⚫

How to recall factory Default settings

Fore more detailed information about multimeter operation, please refer to theUser Guide for the SDM3065X.

Functional check
This functional check covers three areas, by which you can verify if themultimeter is working correctly.

Power-on Inspection
Before connecting the instrument to a power source, please select the ACvoltage selector on the rear panel of your multimeter according to the power
supply. Then connect the power line to the socket on the rear panel of themultimeter.
Note: To avoid electric shock, make sure that the instrument is correctly
grounded to the earth before connecting AC power.
The boot screen will appear after pressing the power-on button to restore theinstrument configuration to factory default settings:
Press [Shift] > [Utility] > Store/Recall >Set To Defaults

Default Setup
After setting to defaults, the multimeter should be set to DC voltage
measurements. Other default settings are shown in the following table.

Default settings
Menu or System

DCV

AcquireMath
Display
Hold

OptionDefault setting

Range
Speed
FilterRel
Trg Src
Delay
Samples/Trigger
VMC Out
Statistics
LimitsdB/dBmRef Value
Display
Probe Hold

Auto
Slow
Off
Off
Auto
Auto
1
Pos
Hide
Off
Off
Off
NumberOff

Self Test
The SDM3065X provides self-test functions, including keyboard Test, LCD
Test, Beeper Test and Chip Test.
Operating Steps:
1. Press [Shift] > [Utility] > Test /Admin > Board Test
2. To test the keyboard:
Select keyboard to enter the key test interface. The on-screen lathy
rectangle shapes represent the keys on the front panel. Test all keys andknobs and you should also verify that all the backlit buttons illuminate
correctly.
3. To test the LCD screen:
Select LCD to enter the screen test interface, the screen shows themessage:” Press ‘Change’ to change Press ‘Done’ to exit“. Press Change
to start the test and observe if the screen has any defects (missing pixels,
for example).
4. To test the beeper:
Press Beeper to test the beeper. Under regular circumstance, press
Beeper once and the instrument will beep one time.
5. Test the chips:
Press Chip > Start to start chip test. Determine whether the chip test
passes according to the interface message.
SDM3065X Service Manual 11Performance Verification
Use the performance verification tests in this section to verify themeasurement performance of the instrument using the instrument’s
specifications listed in the product data sheet. Performance verification tests
are recommended as an acceptance test when you first receive the instrument
or after performing calibration. If the instrument fails performance verification,
calibration adjustment or repair is required.

Performance verification test items
⚫
⚫
⚫
⚫
⚫

Zero Offset Verification
DC Voltage and DC Current Gain Verification
Frequency Accuracy Verification
AC Voltage and AC Current Verification High Current Verification
Capacitance Verification

Recommended Test Equipment
The recommended test equipment for the performance verification andcalibration is listed below. If the exact instrument is not available, substitutecalibration standards of equivalent accuracy.
Application

Recommended Equipment

Zero Offset Verification

Keysight 34172B

DC Voltage and DC Current Gain
Verification

Fluke 5522A

Frequency Accuracy Verification

Siglent SDG2000X Series Function/Arbitrary
Waveform Generator

AC Voltage and AC Current
Verification

Fluke 5522A

Capacitance Verification

Fluke 5522A

Performance verification step
1. Connect the calibrator to the input terminals correctly.
2. Configure each function and range in the order shown in the tablecorresponding to the DMM model number. Provide the input shown in thetable.
3. Make a measurement and return the result. Compare measurement results
to the test limits shown in the table. (Be certain to allow for appropriate
source settling time.)Test Considerations⚫
⚫
⚫
⚫

Ensure that the test ambient temperature is stable and between 18°C and
28°C. Ideally the calibration should be performed at 23°C±2°C.
Ensure ambient relative humidity is less than 80%.
Allow a 90 minute warm–up period with a copper short connected.
Ensure the measuring rate is set to “slow” for DCV, ACV, DCI, ACI and
2-Wire/ 4-Wire Resistance measurements.

Zero Offset Verification
Input

Open

Short

Short

Function

DC Current

DC Volts

4-wire Ohms

Range

Error from Nominal(1 years)

200 μA±0.01 μA

2 mA

±0.04 μA

20 mA

±1 μA

200 mA±4 μA

2A±240 μA

10 A±500 μA

200 mV±4.3 μV

2V±12 μV

20 V±80 μV

200 V

±1 mV

1000 V

±8 mV

200 Ω

±8 mΩ

2 kΩ

20 mΩ

20 kΩ

200 mΩ

200 kΩ

2Ω

1 MΩ

10 Ω

10 MΩ

100 Ω

100 MΩ

100 Ω

SDM3065X Service Manual 13

DC Voltage and DC Current Gain Verification
Input
Voltage

Function-200 mV
200 mV

Range

Error from Nominal(1 years)

200 mV±12.6 μV

2V

±82 μV-2 V
2V±480 μV

10 V
-20 V

DC Volts

20 V±880 μV

20 V-200 V

200 V

200 V
-500 V±11 mV±35.5 mV

1000 V

1000 VInput±63 mV

Range

Error from Nominal(1 years)

200 μA

200 μA±0.12 μA

2 mA

2 mA

±1.04 μA

20 mA

±12 μA

200 mA±104 μA

2A

2A±1.12 mA

10 A

10 A

±15.5 mA

Current

20 mA
200 mA

Function

DC Current

Input
Range

Error from Nominal(1 years)

200 Ω

200 Ω

±28 mΩ

2 kΩ

2 kΩ

±220 mΩ20 kΩ

±2.2 Ω

200 kΩ

±22 Ω

1 MΩ

1 MΩ

±130 Ω

10 MΩ

10 MΩ

±4.1 kΩ

100 MΩ

±810 kΩResistance20 kΩ
200 kΩ

100 MΩ

Function

4-wire Ohms

2-wire Ohms

Frequency Accuracy Verification
Input
Vrms

Frequency

Range

Error from Nominal(1 years)

60 mV

500 kHz

200 mV±35 Hz

0.3 V

20 Hz

2V

±0.004 Hz

AC Voltage and AC Current Verification
Input
Vrms

Frequency

Range±200 μV

1 kHz
200 mV2V

50 kHzError from Nominal(1 years)

200 mV±340 μV

100 kHz±1.36 mV

1 kHz

±1.8 mV

50 kHz2V±3.4 mV

100 kHz

±13.6 mV

0.2 V

1 kHz

±28.16 mV

2V

1 kHz

±29.6 mV

45 Hz
20 V

200 V

20 kHz

20 V±24 mV±24 mV

50 kHz±40 mV

100 kHz±136 mV

1 kHz±220 mV

50 kHz200 V±400 mV

100 kHz±1.36 V

750 V

1 kHz

±825 mV

250 V

50 kHz75 V

100 kHz±1.8 V

Input

Error from Nominal(1 years)

Irms
200uA
20mA

Frequency
1 kHz
10 kHz
1 kHz

750 V

Range
200uA
20mA

±750 mV±0.42 uA
±0.21 uA
±0.042 mA
SDM3065X Service Manual 15

2mA
200mA
20mA

10 kHz±0.21mA

1 kHz±0.282 mA

1 kHz

200mA

10 kHz±0.9 mA

1 kHz±3.23 mA

1 kHz

2A

±0.28 mA

2A

10 kHz

200mA

1 kHz

10A

1 kHz

±4.2 mA±21 mA

10A±20.3 mA
±25 mA

Capacitance Verification
Input
Capacitance

Range

Error from Nominal(1 years)

2 nF

2 nF

±0.088 nF

20 nF

20 nF

±0.22 nF

200 nF

200 nF±2.2 nF

2 μF

2 μF

±22 nF

20 μF

20 μF

±220 nF

200 μF200 μF±2.2 μF

2 mF

2 mF

22 μF

20 mF

20 mF

220 μF

100 mF

100 mF

3.1 mF

Assembly ProceduresThis chapter describes how to remove the major modules from the SDM3065X
multimeter. To install the removed modules or replace new modules, please
follow corresponding operating steps in reverse order.

Security Consideration
Only qualified personnel should perform the disassembly procedures.
Whenever possible, disconnect the power before removing or replacing.
Otherwise, personal injuries or damages to the components may occur.
Avoid Electric Shock Hazardous voltages exist on the LCD module andpower supply module. To avoid electrical shock, disconnect the power cordfrom the multimeter, and then wait at least three minutes for the capacitors in
the multimeter to discharge before beginning the disassembly.
Preventing ESD Almost all electrical components can be damaged byelectrostatic discharge (ESD) during handling. Component damages can occur
at electrostatic discharge voltages as low as 50 volts. The following guidelines
will help preventing ESD damage when servicing the instrument or any
electronic device.
◆ Disassemble instruments only in a static-free work area.
◆ Use a conductive work area to reduce static charges.
◆ Use a conductive wrist strap to reduce static charge accumulation.
◆ Minimize handling.
◆ Keep replacement parts in original static-free packaging.
◆ Remove all plastic, foam, vinyl, paper and other static-generating materials
from the immediate work area.
◆ Use only anti-static solder suckers.

Required Tools
Use these tools to remove or replace the modules in the multimeter:⚫

T10 hexagon screwdriver⚫

2# Phillips screwdriver⚫

needle-nose pliers
SDM3065X Service Manual 17

Disassembly Procedures
1. Turn off the power and remove all measurement leads and other cables,
including the power cord, from the instrument before continuing.
2. Rotate the handle to the upright position and remove it by pulling outward
where it attaches to the case.

3. Unscrew the four captive screws in the rear bezel and remove the foot pad
as indicated by the arrow shown below

4. Remove the screw on the bottom of the instrument and place it in a safe
location for re-assembly. Slide off the instrument cover as indicated by
the arrow shown below.

SDM3065X Service Manual 19

5. Remove the cable plug(in the red circle and yellow box shown below)
connected to the main body

6. Unscrew the 5 captive screws in the rear metal cover and remove the rearmetal cover.

7. Unscrew the 4 screws and remove the fan.

8. Remove the cable plug connected to the front pannel.

9. Remove the cable and unscrew all the screws,then you can remove
thePCBA.

This concludes the disassembly procedure. To re-assemble the instrument,
reverse the procedure.

SDM3065X Service Manual 21

Troubleshooting
The internal structure of the multimeter consists of the analog board, mainboard and power supply board, key and LCD board, and interface board. They
are linked through cables or connectors. This chapter explains the mainprocedures for checking the functionality of these three boards (mainly mainboard and analog board) by measuring the corresponding test points andchecking the signals on specific to help determine the reason for the failurethat has been encountered while operating the SDM3065X digital multimeter.

ESD Precautions
While performing any internal test of the multimeter, please refer to thefollowing precautions to avoid damages to its internal modules or components
resulting from ESD.
⚫

Only handle circuit boards by the board edges. Do not touch components
or the board surface with your fingers.

⚫

Reduce handling of static-sensitive modules when necessary⚫

Wear a grounded antistatic wrist strap to insulate the static voltage fromyour body while touching these modules.

⚫

Operate static-sensitive modules only at static-free areas. Avoid handling
modules in areas that allow anything capable of generating or holding astatic charge.

Required Equipment
The equipment listed in the table is required to troubleshoot the multimeter.
Table 6-1 required equipment

Equipment

Critical Specifications

ExampleAccuracy ±0.05%

Siglent SDM3055

Digital Multimeter
1 mV resolution
Oscilloscope

200 MHz Bandwidth

Siglent SDS1204X-E

Analog Board Drawing
The analog board is a signal sampling board that converts the analog input intoa digital signal. Please refer to the following drawing to quickly locate the test
points on the analog board for easy resolution of the failures you encounter.

SDM3065X Service Manual 23

Main Board Drawing
The main board is used to control and manage the whole internal system of themultimeter. It completes the GUI function, controlling and configuration
function for analog board as well as man-machine interaction. Please refer tothe following drawing to quickly locate the test points on the main board foreasy resolution of the failures you encounter.

Power Board Drawing
The main function of the power board is to convert the AC voltage to DC
voltage and supply power to the analog board and main board.

Check the Power Supply
There are two power connectors through which the power board and mainboard can be supplied electricity. For the power board, there are three voltage
test points on its power connector. For the main board, there is one test point.
Before performing the power supply testing procedure, please make sure thatthe multimeter is grounded correctly through the protective lead of the power
cord. Take care not to touch or even disassemble the power supply module
without any safety precautions, or you may probably suffer from electric shockor burn. Here are procedures for testing the power supply:
1. Disconnect the power cord of the multimeter and then check whether thefuse has been burnt out.
2. Remove metal shell of the multimeter using a driver, and then disconnect
the power connector connected to the main board.
3. Focus on the Power Connector for the power board, which contains five pinsfrom Pin 1 to Pin 5. You can test the adjacent pins that are marked with Blue,
Brown, Yellow and White to check whether the AC voltage value is within thecorresponding specified range using a digital multimeter. The voltage
parameters to be tested are listed in table below:
Table 6-2 Test AC voltages for the power board power connector

Pins

Voltage value (V) Error limit (V)Blue to Blue

8

±1

Yellow to Brown

16±2

White to Yellow

16±2

Table 6-3 Test AC voltage for the main board power connector

PinsBlack to Black

Voltage value (V) Error limit (V)8±1

If each tested voltage value is within the corresponding spec range referring to
the table above, then the power supply works normally. Otherwise, it proves tobe faulted, please return it to the factory to have it repaired or contact
SIGLENT.
Note: The main power supply provides an input fuse to protect against thedanger of fire in the event of a failure of the power supply circuitry. However,SDM3065X Service Manual 25this fuse will not fail ("open" or "blow") in normal power supply operation exceptthat after a significant overload occurs. Replace the entire main power supply
assembly if the input fuse fails.

Check the Analog Board
If it is desired to remove the analog board from the metal shelf inside themultimeter, you’d better place it on a clean, insulated mat. Here are proceduresfor testing the analog board:
1. Several types of connectors are used on the analog board. Check to makecertain that all of these are connected properly.
2. After checking these connectors, then connect the multimeter to AC power
and power it on. Check if the voltage values at all test points are within thespecified range using a digital multimeter. The voltage parameters to betested are listed in table 5-3:

Voltage Check
Test the voltage points on the analog board in the table below. To locate thetest points, please refer to the drawing of the analog board. If not each tested
voltage value is within the corresponding spec range referring to table 5-4, it
proves to be faulted, please return it to the factory to have it repaired or contact
SIGLENT.
Table 6-4 Test DC voltages of the analog board

Test point

Name

Test pin

Voltage value (V)Error limit (V)

T1

U6

1

0 (GND)

T2

L1

1 or 2

+3.3

±0.2

T3

L12

1 or 2

+5

±0.2

T4

L14

1 or 2

+5

±0.2

T5

Z1

3

+15

±0.5

T6

U11

4

-15

±0.5

SIGLENT

Analog board Clock Check
Analog board clock is the internal system clock of the multimeter. To verify if
the clock on the analog board works normally, please test the clock frequency
listed below using an oscilloscope.
Table 6-5 Clock Source of the analog Board

Test point Name
T7

R24

Pin
1 or 2Frequency Stability
50 MHz±25 ppm

Check the Main Board
If the main board does need to be removed from the metal shelf located inside
the multimeter, place it on a clean, insulated mat. Testing procedures for themain board are as follows:
1. Several types of connectors are located on the main board. Check if allthese are connected properly.
2. Make sure that the connectors on the main board are properly connected,
then connect the multimeter to AC power and turn it on. Check if the voltage
values at all test points are within the spec range using a digital multimeter.
The voltage parameters to be tested are listed in table 5-6:

Voltage Check
Test the voltage points on the main board in the table below. To locate the test
points, please refer to the drawing of the main board. If not each tested voltage
value is within the corresponding spec range referring to table 5-6, it proves tobe faulted, please return it to the factory to have it repaired or contact
SIGLENT.
Table 6-6 Test DC voltages of the main board

Test point Name

Pin

Voltage value (V) Error limit (V)

TP1

J14

1

+8.6

±2

TP2

U14

4

+3.3

±0.1

TP3

U12

4

+5

±0.2

TP4

TP86

Solder

+16

±2

GND

SC16
SDM3065X Service Manual 27

Microprocessor Check
Observe the LED light on the main board, which indicates the working state of
microprocessor chip. If the light turns on, then the corresponding codes havebeen loaded successfully and the chip is in an operating state. Otherwise,
there may be a problem with it.

Quick Guide for General Failures
The general hardware failures are described in the following. Reading thefollowing information can help you quickly handle some easy hardware failureswith more convenience.
1. No start-up after pressing the Power button:(1) Check if the power cord is correctly connected.
(2) Check if the power button is usable.
(3) Check whether the fuse has been burned out. If the fuse is blown,please replace with a fuse of the same rating.
(4) Check the connection between the power supply and the main board.
(5) If the instrument still does not work normally, please contact SIGLENT.
2. The instrument starts up with a dark screen:(1) Check the connection between the keypad circuit board and the mainboard.
(2) If the instrument still does not work normally, please contact SIGLENT.
3. No response after pressing any button or abnormal display of thescreen:(1) Check the connection between the keypad circuit board and the mainboard.
(2) If the instrument still does not work normally, please contact SIGLENT.

SIGLENT

Maintenance
Maintenance Summary
SIGLENT warrants that the products it manufactures and sells are free fromdefects in materials and workmanship for a period of three years from the dateof shipment from an authorized SIGLENT distributor. If a product provesdefective within the respective period, SIGLENT will provide repair or
replacement as described in the complete warranty statement.
To arrange for service or obtain a copy of the complete warranty statement,
please contact your nearest SIGLENT sales and service office.
Except that as provided in this summary or the applicable warranty Statement,
SIGLENT makes no warranty of any kind, express or implied, including without
limitation the implied warranties of merchantability and fitness for a particularpurpose. In no case shall SIGLENT be liable for indirect, special orconsequential damages.

Repackaging for Shipment
If the unit needs to be shipped to SIGLENT for service or repair, be sure:
1. Attach a tag to the unit identifying the owner and indicating the required
service or repair.
2. Place the unit in its original container with appropriate packaging material
for shipping.
3. Secure the container with strong tape or metal bands.
If the original shipping container is not available, place your unit in a container
which will ensure at least 4 inches of compressible packaging material aroundall sides for the instrument. Use static-free packaging materials to avoid
additional damage to your unit.

SDM3065X Service Manual 29Contact SIGLENTSIGLENT Technologies Co., Ltd
Building No.4 & No.5, Antongda Industrial Zone, 3rd Liuxian Road, Bao'an District,
Shenzhen, China
Tel:+ 86-755-3688-7876
Fax: + 86-755-3359-1582
E-mail: sales@siglent.com
Web: http://int.siglent.com/

SIGLENT Technologies NA, Inc
6557 Cochran Rd Solon, Ohio 44139
Tel: 440-398-5800
Toll Free: 877-515-5551
Fax: 440-399-1211
E-mail: info@siglent.com
Web: www.siglentna.com

SIGLENT Technologies Germany GmbH
Staetzlinger Str. 70, 86165 Augsburg, Germany
Tel: +49(0)-821-666 0 111 0
Fax: +49(0)-821-666 0 111 22
E-mail: info-eu@siglent.com
Web: www.siglenteu.com