Tonghui TH1953 User manual

OPERATION MANUAL
TH1953/63
Digital Multimeter
Changzhou Tonghui Electronic Co., Ltd.
www.tonghui.com.cn

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Contents
Chapter 1 General Information.................................................................................................................................. 4
1.1 Feature Overview......................................................................................................................................... 4
1.2 Operating Environment ............................................................................................................................... 4
1.3 Dimensions and Weight............................................................................................................................... 4
1.4 Safety symbols and Precautions .................................................................................................................. 5
1.5 Unpacking Inspection.................................................................................................................................. 5
1.6 Mark............................................................................................................................................................. 5
1.7 Warranty....................................................................................................................................................... 6
1.8 Limitation of Warranty ................................................................................................................................ 6
Chapter 2 Specifications and Features....................................................................................................................... 7
2.1 Specifications............................................................................................................................................... 7
2.2 Supplementary specifications.................................................................................................................... 10
Chapter 3 Instructions for use.................................................................................................................................. 16
3.1 Front Panel Menu Reference ..................................................................................................................... 16
3.2 Measurement ............................................................................................................................................. 18
3.2.1 DC Voltage...................................................................................................................................... 18
3.2.2 DCV Ratio ...................................................................................................................................... 19
3.2.3 AC Voltage...................................................................................................................................... 20
3.2.4 DC Current...................................................................................................................................... 21
3.2.5 AC Current...................................................................................................................................... 22
3.2.6 Resistance 2W ................................................................................................................................ 23
3.2.7 Resistance 4W ................................................................................................................................ 25
3.2.8 Capacitance Measurement.............................................................................................................. 26
3.2.9 Diode .............................................................................................................................................. 27
3.2.10 Continuity..................................................................................................................................... 27
3.2.11 Temperature test............................................................................................................................ 28
3.2.12 Frequency measurement............................................................................................................... 29
Chapter 4 Arithmetical Operation............................................................................................................................ 32
4.1 Null Operation........................................................................................................................................... 32
4.2 Statistics..................................................................................................................................................... 32
4.3 Limit .......................................................................................................................................................... 32
4.4 dB Calculation........................................................................................................................................... 32
4.5 dBm Calculation........................................................................................................................................ 33
4.6 mX+b......................................................................................................................................................... 33
4.7 Percent....................................................................................................................................................... 33
Chapter 5 Interface .................................................................................................................................................. 34
5.1 RS-232 interface........................................................................................................................................ 34
5.1.1 RS-232 Interface Operation............................................................................................................ 35
5.2 Handler Interface....................................................................................................................................... 37
5.2.1 Handler setup.................................................................................................................................. 38
5.3 USB Interface ............................................................................................................................................ 39
5.3.1 USB Host........................................................................................................................................ 39

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5.4 LAN Interface............................................................................................................................................ 39
5.5 GPIB Interface........................................................................................................................................... 40
5.5.1 GPIB Bus........................................................................................................................................ 40
5.5.2 Setting the GPIBAddress............................................................................................................... 41
5.5.3 General Bus Commands ................................................................................................................. 41
5.5.4 Setting through the interface........................................................................................................... 42
Chapter 6 System Settings....................................................................................................................................... 43
6.1 Set the language......................................................................................................................................... 43
6.2 Setting the date/time.................................................................................................................................. 43
6.3 Setting the buzzer and brightness.............................................................................................................. 43
6.4 Setting the format of the digital display..................................................................................................... 43
Chapter 7 SCPI Command Reference ..................................................................................................................... 44
7.1 SCPI Language Profile .............................................................................................................................. 44
7.1.1 Grammatical conventions............................................................................................................... 44
7.1.2 Command separator........................................................................................................................ 44
7.1.3 Using MIN, MAX and DEF parameters......................................................................................... 45
7.1.4 Query Parameter Settings ............................................................................................................... 45
7.1.5 Parameter Type ............................................................................................................................... 45
7.2 Subsystem commands................................................................................................................................ 46
7.2.1 CONFigure Subsystem ................................................................................................................... 46
7.2.2 MEASure subsystem....................................................................................................................... 49
7.2.3 TRIGger subsystem ........................................................................................................................ 52
7.2.4 [SENSe:]VOLTage subsystem........................................................................................................ 55
7.2.5 [SENSe:]CURRent Subsystem....................................................................................................... 58
7.2.6 [SENSe:]{RESistance|FRESistance} subsystem............................................................................ 60
7.2.7 [SENSe:]{FREQuency|PERiod} Subsystem.................................................................................. 61
7.2.8 [SENSe:]TEMPerture Subsystem................................................................................................... 63
7.2.9 [SENSe:]CAPacitance subsystem................................................................................................... 64
7.2.10 SYSTem Subsystem - I/O Configuration...................................................................................... 65
7.2.11 SYSTem Subsystem - General Command .................................................................................... 67
7.2.12 DATA2 subsystem ........................................................................................................................ 68
7.2.13 NULL subsystem .......................................................................................................................... 68
7.2.14 CALCulate:SCALe subsystem ..................................................................................................... 70
7.2.15 CALCulate: LIMit subsystem....................................................................................................... 72
7.2.16 CALCulate: AVERage Subsystem................................................................................................ 72

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Chapter 1 General Information
Thank you for purchasing and using our products. Before using the instrument, first confirm it according to the
“1.5 Unpacking Inspection” section of this chapter in this manual. If there is any discrepancy, please contact our
company as soon as possible to protect your rights. If you still have questions after reading this manual, please
contact your local distributor or call our company's engineers directly for further consultation.
1.1 Feature Overview
TH1953/63 is a digital multimeter with high accuracy, stability and speed. The instrument provides a maximum
measurement speed of 1000 times/sec. TH1953/63 has a 0.0035% DC voltage basic accuracy, 0.0100% basic
resistance accuracy and other high performance.
TH1953/6363 has broad measurement ranges:
DC voltage from 0.1μV to 1000V
AC voltage from 0.1μV to 750V, peak value of 1000V
DC current from 10nA to 10A
AC current from 10nA to 10A
Resistance measurement from 0.01mΩ to 120MΩ
Frequency from 2Hz to 1MHz
Some additional capabilities of Model TH1953/63:
Full range of functions: In addition to those listed above, TH1953/63 functions include period, dB, dBm,
continuity, diode testing, arithmetical operation (mX+b) and percentage calculation.
Programming languages and remote control interfaces: This instrument provides SCPI programming
language and the remote control interface ports USB Device, RS-232C, LAN, IEEE-488/GPIB (option)
and Handler (option) interface.
Readings and instrument settings: Up to 10,000 readings can be stored in local mode.
Completed calibration: The unit can be calibrated either from the front panel or through the remote
control interface.
1.2 Operating Environment
Power supply: 110V/220V ±10%
Line frequency: 50Hz / 60Hz ±5%
Power consumption: ≤30VA
Operating temperature: 0℃to 40℃
Humidity: ≤ 90%RH
1.3 Dimensions and Weight
Dimensions (W×H×D): 225mm×100mm×355mm
Net weight: Around 2.5Kg

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1.4 Safety symbols and Precautions
The symbol on the instrument indicates that user should refer to the operating instructions located in the
manual before performing.
The symbol on the instrument shows that high voltage may be present on the terminal(s). Be careful to
avoid personal contact with these voltages.
The symbol on the instruments means earth grounding.
The WARNING heading used in the manual explains high voltage danger that might result in personal injury or
death. Always read the associated information very carefully before performing the indicated procedure.
The CAUTION heading in the manual reminds user that hazards could damage the instruments if not according
to operating instructions. Such damage may invalidate the warranty.
1.5 Unpacking Inspection
TH1953/63 was carefully inspected mechanically and electrically before shipment. After unpacking all items from
the shipping carton, please check for any obvious signs of physical damage that may have occurred during
transportation. Report any damage to the shipping agent immediately. Save the original packing carton for
possible future reshipment. The following items are included with every Model TH1953/63 order:
Model TH1953/63 Digital Multimeter*1
Test leads (Model TH26036)*1
USB interface connection cable (TH26018)*1
Power cord*1
T500mAL fuse*2
T3.15AL fuse*2
Test report*1
Warranty card*1
Other optional accessories if ordered*1
Verify that you have received all the items above when you get the multimeter. If anything is missing, please
contact our representative or our sales office.
Note: The IEEE-488 interface and Handler interface of this instrument are optional and need to be purchased
separately. And these two interfaces cannot be installed at the same time.
1.6 Mark
The following marks are on each instrument panel or nameplate:
•Manufacturer's name or trademark
•Product name and model
•Product number

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•Manufacturing measuring instrument license signs and numbers
•Test terminal mark
1.7 Warranty
Tonghui warrants this product to be free from defects in material and workmanship for a period of one year from
the date of shipment. During the warranty period, we will, at our option, either repair or replace any product that
proves to be defective.
1.8 Limitation of Warranty
This warranty does not apply to defects resulting from product modification without our express written consent,
or misuse of any product or part. This warranty also does not apply to fuses, software, or problems arising from
normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES
PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER TONGHUI ELECTRONICS NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND SOFTWARE EVEN IF TONGHUI ELECTRONICS HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE
NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF
INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

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Chapter 2 Specifications for TH1953
Technical description
Technical indicator assumption
One year calibration cycle
Operating temperature environment: 18 °C ~ 28 °C
Calibration temperature TCAL=23°C
It is calibrated after warming up for 60 minutes
Accuracy representation: ±(% reading + % range)[1]
Operating humidity environment: at 0 °C ~ 18 °C (when the resistance range is ≥10M, ≤70% RH), ≤80%RH,
at 28°C ～40°C, ≤70%RH
2.1 Specifications
DC voltage technical indicators
Range
Resolution
Full Scale Reading
1 year
TCAL ±5°C
Typical Input Impedance
100.000mV
1uV
119.999mV
0.012+ 0.008[2]
>10GΩ[1]
1.00000V
10uV
1.19999V
0.010+ 0.005
>10GΩ[1]
10.0000V
100uV
11.9999V
0.010+ 0.005
>10GΩ[1]
100.000V
1mV
119.999V
0.010+ 0.005
10MΩ
1000.00V[6]
10mV
1050.00V[3]
0.010+ 0.005
10MΩ
DC current technical indicators
Range
Internal Resistance Voltage
Drop
Resolution
Full Scale Reading
1 year
TCAL ±5°C
100.000uA
<0.011V
1nA
119.999uA[1]
0.050 + 0.008
1.00000mA
<0.011V
10nA
1.19999mA
0.050 + 0.005
10.0000mA
< 0.05 V
0.1uA
11.9999mA[1]
0.050 + 0.008
100.000mA
< 0.5 V
1uA
119.999mA
0.050 + 0.005
1.00000A
< 0.7 V
10uA
1.19999A
0.100 + 0.010
3.00000A
< 2.0 V
10uA
3.00000A[2]
0.150 + 0.020
10.0000A
< 0.5 V
100uA
11.9999A[3]
0.200 + 0.010

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DC resistance technical indicators [7] [8]
Range
Test Current
Resolution
Full Scale Reading
1 year
TCAL ±5°C
10.00000Ω
10mA
0.1mΩ
11.9999Ω
0.050+ 0.008[1]
100.0000 Ω
10mA
1mΩ
119.999Ω
0.040+ 0.005[1]
1.000000kΩ
1mA
10mΩ
1.19999kΩ
0.030+ 0.004[1]
10.00000kΩ
100uA
0.1mΩ
11.9999kΩ
0.030+ 0.004
100.0000kΩ
50uA
1Ω
119.999kΩ
0.030+ 0.004
1.000000MΩ
5uA
10Ω
1.19999MΩ
0.030+ 0.004[2]
10.00000MΩ
500nA
100Ω
11.9999MΩ
0.100+ 0.004[2]
100.0000MΩ
500nA/10M
1kΩ
119.999MΩ
1.000+ 0.010[2]
Continuity (conduction) test technical indicators
Range
Test Current
Resolution
Full Scale Reading
1 year
TCAL ±5°C
1kΩ
1mA
10mΩ
1199.99Ω
0.030+ 0.004
Diode test technical indicators
Range
Test Current
Resolution
Full Scale Reading
1 year
TCAL ±5°C
5V
1mA
0.1mV
5.0000V
0.010+ 0.005
Temperature test technical indicators
Temperature
PT100 (DIN/ IEC 751)
Probe accuracy + 0.05°C
5 kΩ thermistor
Probe accuracy + 0.10°C
Capacitance test technical indicators
Range
Test Current
1 year
TCAL ±5°C
Temperature
coefficient /°C
1.0000nF
10uA
1.0+0.5
0.02
10.000nF
10uA
0.5+0.1
0.02
100.00nF
10uA
0.5+0.1
0.02
1.0000uF
100uA
0.5+0.1
0.02
10.000uF
100uA
0.5+0.1
0.02
100.00uF
1mA
0.5+0.1
0.02
1.0000mF
10mA
0.5+0.1
0.02
10.000mF
10mA
1.0+0.5
0.02

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AC voltage test technical indicators [6] [9] [10]
Range
Resolution
Full Scale
Reading
1 year TCAL ±5°C
3-5 Hz
5-20 Hz
20Hz-20kHz
20-50kHz
50-100 kHz
100-300kHz
100mV
1uV
119.999mV
1.00+0.03
0.38+0.03
0.10+0.03
0.15+0.05
0.63+0.08
4.00+0.50
1V
10uV
1.19999V
1.00+0.03
0.38+0.03
0.10+0.03
0.15+0.05
0.63+0.08
4.00+0.50
10V
100uV
11.9999V
1.00+0.03
0.38+0.03
0.10+0.03
0.15+0.05
0.63+0.08
4.00+0.50
100V
1mV
119.999V
1.00+0.03
0.38+0.03
0.10+0.03
0.15+0.05
0.63+0.08
4.00+0.50
750V[5]
10mV
750.00V[3]
1.00+0.03
0.38+0.03
0.10+0.03
0.15+0.05
0.63+0.08
4.00+0.50
AC current test technical indicators [6] [10] [11]
Range
Voltage drop
Resolution
Full Scale
Reading
1 year
TCAL ±5°C
3-5 Hz
5-20 Hz
20Hz-10kHz
100.000uA
<0.011V
1nA
119.999uA[1]
1.00+0.03
0.5+0.03
0.20 + 0.04
1.00000mA
<0.011V
10nA
1.19999mA
1.00+0.03
0.5+0.03
0.20 + 0.04
10.0000mA
< 0.05 V
0.1uA
11.9999mA[1]
1.00+0.03
0.5+0.03
0.20 + 0.04
100.000mA
< 0.5 V
1uA
119.999mA
1.00+0.03
0.5+0.03
0.20 + 0.04
1.00000A
< 0.7 V
10uA
1.19999A
1.00+0.03
0.5+0.03
0.20 + 0.04
3.00000A
< 2.0 V
10uA
3.00000A[2] [3]
1.00+0.03
0.5+0.03
0.25+0.04
10.0000A
< 0.5 V
100uA
11.9999A[4]
1.00+0.03
0.5+0.03
0.30+0.04
Frequency test count indicator [13] [14]
Frequency
Resolution
Full Scale
Reading
1 year
TCAL ±5°C
3Hz - 10Hz[2]
10uHz
9.99999Hz
0.050 + 50
10Hz - 100Hz
100uHz
99.9999Hz
0.010 + 10
100Hz - 1kHz
1mHz
999.999Hz
0.005 + 2
1kHz - 10kHz
10mHz
9.99999kHz
0.005 + 2
10kHz - 100kHz
0.1Hz
99.9999kHz
0.005 + 2
100kHz - 300kHz
1Hz
300.000kHz
0.005 + 2
300kHz - 1MHz[3]
1Hz
999.999kHz
0.005 + 2
[1]. For DC: The technical specifications are valid when the instrument has preheated after 60 minutes, the
integration time is set to 10 or 100 NPLC, and auto zero is enabled. For AC: The technical specifications are valid
after 60 minutes of preheating, slowAC filtering, and sine wave.
[2]. Outside the range of TCAL ±5 °C, the temperature coefficient is increased by 1 for every 1 degree Celsius
change.
[3]. Relevant calibration standards.
[4]. The smallest data change that can be displayed.
[5]. Full-scale accuracy, there is need to perform NULL (clearing) operation in order to get better accuracy.
[6]. DC 1000V, AC 750V, AC current 3A and DC current 3A can only test 5% of the overrange.
[7]. When measuring resistance, it is better to use shielded line test when the resistance is greater than 100kΩ.
Because the cutting magnetic field generates an induced current, and the large resistor has a relatively small test

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current, the signal-to-noise ratio will be small and the test will be unstable.
[8]. Specifications are applicable to 4-wire or 2-wire resistance measurements. When the zero clearing is not
activated, the 2-wire resistance measurement will increase the additional error of 0.2Ω.
[9]. Specifications are valid when the sine wave input is >0.3% of the range and greater than 1mVrms. The
750-ACV range is limited to the 8 x Volt–Hz range.
[10]. Low Frequency Performance: three filter settings are available: 3 Hz, 20 Hz, 200 Hz. The frequency above
the filter setting is specified and no additional errors will occur.
[11]. Specifications are valid when sine wave input >1% range and >10μA AC. The 10A range is only available on
the front connector.
[12]. Specifications are applicable to the voltage measured at the input terminal. The 1 mA test current is typical
value.A change in the current source will cause a change in the voltage drop across the diode junction.
[13]. Unless otherwise stated, the specifications are valid when the instrument has warmed up for 60 minutes and
have a sine wave input. Specifications apply to 1s strobe time (7 digits). The signal is greater than 10% of the
selected range.
[14]. It is applicable when the sine and square wave are input larger than 100 mV. For a 10 mV to 100 mV input,
multiply the % of the reading error by 10.
[15]. The high-frequency signal has a serious attenuation in the latter stage, so the input voltage of the test signal
should be relatively large. The test signal is 1V-1MHz, and the input signal is preferably greater than 50% of the
range.
[16]. The square wave input is specified as 10 Hz-300 kHz.
2.2 Supplementary specifications
Display readings and measuring speed
DC resistance, DC voltage, DC current [1]
Integral time
Default
digits [2]
Reading/second[3]
System
speed [4]
Extra error
100PLC/2s(1.67s)
0.5(0.6)
0.5(0.6)
0
10PLC/200ms(167ms)
5(6)
5(6)
0
1PLC/20ms(16.7ms)
45(55)
45(55)
0.001% range
0.2PLC/4ms
200
50
0.001% range [5]
0.02PLC/400μs
1000
50
0.01% range [5]