SIGLENT SM06035-E01A Service Manual
Service Manual
SDM3055 Series Digital Mulimeter
SM06035-E01A
2016 SIGLENT TECHNOLOGIES CO., LT
SDM3055 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 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 or
consequential in connection with the furnishing, use or performance of this
manual 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: 2008 standard and the ISO14001:
2004 standard. Other international standard conformance certification is in
progress.
II SDM3055 Service Manual
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 product
and approved by local state.
Avoid Electric Shock. To avoid injuries or losses of life, do not connect or
disconnect 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 high
voltage 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.
SDM3055 Service Manual III
Avoid Circuit or Wire Exposed. Do not touch exposed junctions and
components when the unit is powered.
Do Not Operate With Suspected Failures. If you suspect damage occurs to
this instrument, have it inspected by qualified service personnel before
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 condition.
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 an injury or hazard may be accessible potentially.
CAUTION: Indicates damage to the instrument or other property may occur.
Symbols on the Product. These symbols may appear on the product:
IV SDM3055 Service Manual
Catalog
Guaranty and Declaration .............................................................................................................. I
General Safety Summary .............................................................................................................. II
General Features and Specifications .......................................................................................... 1
General Features.................................................................................................................... 1
Specifications .......................................................................................................................... 2
Prepare Information ....................................................................................................................... 6
Functional checking ............................................................................................................... 6
Power-on Inspection ...................................................................................................... 6
Default Setup .................................................................................................................. 6
Self Test ........................................................................................................................... 7
Performance Verification ............................................................................................................... 8
Performance verification test items ..................................................................................... 8
Recommended Test Equipment ........................................................................................... 8
Performance verification step ............................................................................................... 8
Test Considerations................................................................................................................ 9
Zero Offset Verification .......................................................................................................... 9
DC Voltage and DC Current Gain Verification ................................................................. 10
Frequency Accuracy Verification ........................................................................................ 11
AC Voltage and AC Current Verification ............................................................................ 12
Capacitance Verification ...................................................................................................... 13
Calibration Adjusting Procedures .............................................................................................. 14
Calibration Adjustment Interval........................................................................................... 14
Calibration is Recommended ............................................................................................. 14
Automating Calibration Procedures ................................................................................... 14
Calibration Adjustment items .............................................................................................. 14
Recommended Test Equipment ......................................................................................... 15
Software Environment ......................................................................................................... 15
Test Considerations.............................................................................................................. 15
Calibration Adjustment step ................................................................................................ 16
Assembly Procedures .................................................................................................................. 17
Security Consideration ........................................................................................................ 17
Required Tools ...................................................................................................................... 17
Disassembly Procedures .................................................................................................... 18
Troubleshooting ............................................................................................................................ 22
ESD Precautions .................................................................................................................. 22
Required Equipments .......................................................................................................... 22
Analog Board Drawing ......................................................................................................... 23
Main Board Drawing ............................................................................................................ 24
Check the Power Supply ..................................................................................................... 25
Check the Analog Board ...................................................................................................... 27
Voltage Checking .......................................................................................................... 27
SDM3055 Service Manual V
Analog board Clock Checking .................................................................................... 28
Check the Main Board ......................................................................................................... 29
Voltage Checking .......................................................................................................... 29
Microprocessor Checking ............................................................................................ 29
Quick Guide for General Failures ...................................................................................... 30
Maintenance .................................................................................................................................. 31
Maintain Summary ............................................................................................................... 31
Repackaging for Shipment .................................................................................................. 31
Contact SIGLENT ......................................................................................................................... 32
SDM3055 Service Manual 1
General Features and Specifications
SDM3055 is a 5½ dual-display instrument designed with 5½ digits readings
resolution and dual-display, especially fitting to the needs of high-precision,
multifunction, and automation measurements. It realized a combination of
basic measurement functions, multiple math functions, and display functions,
etc.
General Features
4.3 inch color TFT-LCD display screen with 480*272 high resolutions
Real 5½ digits readings resolution
Up to 150rdgs/S measurement speed
True-RMS AC Voltage and AC Current measurements
1 Gb Nand Flash size, mass storage configuration files and data files
Built-in cold terminal compensation for thermocouple
Support standard SCPI and control software on PC, compatible with
commands of main stream multimeters
Supports dual-display function, Chinese and English menu
Built-in help system, convenient to acquire information
Support USB Device, USB Host, LAN, and USB-GPIB (only for
SDM3055A) interfaces
Configuration and measured data can be imported or exported via VXI 11,
USBTMC and USB flash drive, which is convenient for users to modify,
view and backup
2 SDM3055 Service Manual
Specifications
DC Characteristic
Accuracy±（% of Reading + % of Range）
[1]
Function
Range
[2]
Test current or
Load voltage
1 Year
23℃±5℃
Temperature
coefficient
0℃～18℃
28℃～50℃
DC Voltage
200 mV
0.015+ 0.004
0.0015+ 0.0005
2 V
0.015+ 0.003
0.0010+ 0.0005
20 V
0.015+ 0.004
0.0020+ 0.0005
200 V
0.015+ 0.003
0.0015+ 0.0005
1000 V
[4]
0.015+ 0.003
0.0015+ 0.0005
DC Current
200 μA
< 8 mV
0.055+ 0.005
0.003+ 0.001
2 mA
< 80 mV
0.055+ 0.005
0.002+ 0.001
20 mA
< 0.05 V
0.095+ 0.020
0.008+ 0.001
200 mA
< 0.5 V
0.070+ 0.008
0.005+ 0.001
2 A
< 0.1 V
0.170+ 0.020
0.013+ 0.001
10 A
[5]
< 0.3 V
0.250+ 0.010
0.008+ 0.001
Resistance
[3]
200 Ω
1 mA
0.030+ 0.005
0.0030+ 0.0006
2 KΩ
1 mA
0.020+ 0.003
0.0030+ 0.0005
20 KΩ
100 μA
0.020+ 0.003
0.0030+ 0.0005
200 KΩ
10 μA
0.020+ 0.010
0.0030+ 0.0005
2 MΩ
1 μA
0.040+ 0.004
0.0040+ 0.0005
10 MΩ
200 nA
0.250+ 0.003
0.0100+ 0.0005
100 MΩ
200 nA || 10 MΩ
1.75+ 0.004
0.2000+ 0.0005
Diode Test
4.0 V
[6]
1 mA
0.05+ 0.01
0.0050+ 0.0005
Continuity Test
2000 Ω
1 mA
0.05+ 0.01
0.0050+ 0.0005
Remarks:
[1] Specifications are for 0.5 Hour warm-up, “Slow” measurement rate and calibration
temperature 18℃～28℃.
[2] 20% over range on all ranges except for DCV 1000 V, ACV 750 V, DCI 10 A and ACI
10 A.
[3] Specifications are for 4-wire measure or 2-wire measure under “REF” operation. ±0.2Ω
of extra errors will be generated if perform 2-wire measure without “REF” operation.
[4] Plus 0.02 mV of error per 1 V after the first ±500 VDC.
[5] 30 seconds OFF after 30 seconds ON is recommend foe the continuous current that
higher than DC 7 A or AC RMS 7 A.
[6] Accuracy sepcifications are only for voltage measuring at input terminal. The typical
value of current under measure is 1 mA. Voltage drop at diode junction may vary with
current supply.
SDM3055 Service Manual 3
AC Characteristic
Accuracy±（% of Reading + % of Range）
[1]
Function
Range
[2]
Frequency Range
1Year
23℃±5℃
Temperature
coefficient
0℃～18℃
28℃～50℃
True-RMS
AC Voltage
[3]
200 mV
20 Hz – 45 Hz
1.5 + 0.10
0.01 + 0.005
45 Hz – 20 KHz
0.2 + 0.05
0.01 + 0.005
20 KHz – 50 KHz
1.0 + 0.05
0.01 + 0.005
50 KHz –100 KHz
3.0 + 0.05
0.05 + 0.010
2 V
20 Hz – 45 Hz
1.5 + 0.10
0.01 + 0.005
45 Hz – 20 KHz
0.2 + 0.05
0.01 + 0.005
20 KHz – 50 KHz
1.0 + 0.05
0.01 + 0.005
50 KHz –100 KHz
3.0 + 0.05
0.05 + 0.010
20 V
20 Hz – 45 Hz
1.5 + 0.10
0.01 + 0.005
45 Hz – 20 KHz
0.2 + 0.05
0.01 + 0.005
20 KHz – 50 KHz
1.0 + 0.05
0.01 + 0.005
50 KHz –100 KHz
3.0 + 0.05
0.05 + 0.010
200 V
20 Hz – 45 Hz
1.5 + 0.10
0.01 + 0.005
45 Hz – 20 KHz
0.2 + 0.05
0.01 + 0.005
20 KHz – 50 KHz
1.0 + 0.05
0.01 + 0.005
50 KHz –100 KHz
3.0 + 0.05
0.05 + 0.010
750 V
20 Hz – 45 Hz
1.5 + 0.10
0.01 + 0.005
45 Hz – 20 KHz
0.2 + 0.05
0.01 + 0.005
20 KHz – 50 KHz
1.0 + 0.05
0.01 + 0.005
50 KHz –100 KHz
3.0 + 0.05
0.05 + 0.010
True-RMS
AC Current
[4]
20 mA
20 Hz – 45 Hz
1.5 + 0.10
0.015 + 0.015
45 Hz – 2 KHz
0.50 + 0.10
0.015 + 0.006
2 KHz – 10 KHz
2.50 + 0.20
0.015 + 0.006
200 mA
20 Hz – 45 Hz
1.5 + 0.10
0.015 + 0.005
45 Hz – 2 KHz
0.50 + 0.10
0.015 + 0.005
2 KHz – 10 KHz
2.50 + 0.20
0.015 + 0.005
2 A
20 Hz – 45 Hz
1.5 + 0.20
0.015 + 0.005
45 Hz – 2 KHz
0.50 + 0.20
0.015 + 0.005
2 KHz – 10 KHz
2.50 + 0.20
0.015 + 0.005
10 A
[5]
20 Hz – 45 Hz
1.5 + 0.15
0.015 + 0.005
45 Hz – 2 KHz
0.50 + 0.15
0.015 + 0.005
2 KHz – 10 KHz
2.50 + 0.20
0.015 + 0.005
4 SDM3055 Service Manual
Additional wave crest factor error ( not Sine )
[6]
Wave crest coefficient
Error（% Range）
1-2
0.05
2-3
0.2
Remarks:
[1] Specifications are for 0.5 Hour warm-up, “Slow” measurement rate and calibration
temperature 18℃～28℃.
[2] 20% over range on all ranges except for DCV 1000 V, ACV 750 V, DCI 10 A and ACI
10 A.
[3] Specifications are for amplitude of sine wave input > 5% of range. For inputs from 1%
to 5% of range and <50 kHz, add 0.1% of range extra error. For 50 kHz to 100 kHz,
add 0.1% of range extra error.
[4] Specifications are for sine wave input > 5% of range. 0.1% errors wills be added when
the range of input sine wave is 1% to 5% .
[5] 30 seconds OFF after 30 seconds ON is recommend foe the continuous current that
higher than DC 7 A or AC RMS 7 A.
[6] Specifications are for frequency of input < 100Hz
Frequency and Period Characteristic
Accuracy±（% of Reading + % of Range）
[1]
Function
Range
Frequency Range
1 Year
23℃±5℃
Temperature
coefficient
0℃～18℃
28℃～50℃
Frequency
/Period
200 mV to 750 V
[2]
20 Hz – 2 KHz
0.01+0.003
0.002+0.001
2 KHz – 20 KHz
0.01+0.003
0.002+0.001
20 KHz – 200 KHz
0.01+0.003
0.002+0.001
200 KHz –1 MHz
0.01+0.006
0.002+0.002
Remarks:
[1] Specifications are for 0.5 Hour warm-up.
[2]Except for special marks, the AC input voltage is 15% to 120% of range when <100 kHz
and 30% to 120% of range when >100 kHz. 750 V range is limited to 750 Vrms.
Capacitance Characteristic
Accuracy±（% of Reading + % of Range）
[1]
Function
Range
[2]
Max Testing
Current
1 Year
23℃±5℃
Temperature
coefficient
0℃～18℃
28℃～50℃
Capacitance
2 nF
200 nA
3+1.0
0.08+0.002
20 nF
200 nA
1+0.5
0.02+0.001
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