Tonghui TH1952 Operation Manual

5 1/2 digit multimeter

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OPERATION MANUAL

TH1952

Digit Multimeter

Changzhou Tonghui Electronic Co., Ltd.

www.tonghui.com.cn

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Page 1 OPERATION MANUAL TH1952 Digit Multimeter Changzhou Tonghui Electronic Co., Ltd. www.tonghui.com.cn...
Page 2 Manual Printing History The manual printing data and part number indicate its current edition. The printing date changes when a new edition is printed. The manual part number changes when extensive technical changes are incorporated. October 2015……………………………………………………………………………………………………………First Edition Announcement The description of the manual may not cover all contents of the instrument, and our company is subject to change and to improve the performance, function, inner structure, appearance, accessory and package of the instrument without notice.
Page 3: Table Of Contents
1.4 Safety symbols and Precautions ....................6 1.5 Incoming Inspection ........................6 1.6 Warranty ............................7 1.7 Limitation of Warranty ........................7 Chapter 2 TH1952 Overview ........................8 2.1 Brief introduction ......................... 8 2.2 Front Panel Summary ......................... 8 2.2.1 Annunciators on Screen ....................10 2.2.2 Front Panel Menu Reference ..................
Page 4 4.2.1 Trigger procedure ......................29 4.2.2 Measurement Sample ..................... 30 4.2.3 Reading Hold ........................30 4.2.4 External trigger ........................ 31 4.3 Limit Operations ........................31 4.4 System Operations ........................32 4.4.1 Beeper Control ........................ 32 4.4.2 Key Sound ........................32 4.4.3 Display ..........................
Page 5: Chapter 1 General Information
Feature Overview TH1952 is a 5½ digital multimeter with high accuracy, stability and speed. The digital multimeter provides a maximum measurement speed of 200 readings/sec. TH1952 has a 0.012% DC voltage basic accuracy, 0.05% basic resistance accuracy and other high performance.
Page 6: Dimensions And Weight
Such damage may invalidate the warranty. Incoming Inspection The TH1952 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.
Page 7: Warranty
Warranty Tonghui warrants this product to be free from defects in material and workmanship for a period of 2 years 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.
Page 8: Chapter 2 Th1952 Overview
Limit test with HI/LO signal can help you select good products Front Panel Summary The front panel of the TH1952 is shown in Figure 2-1. This figure includes some important abbreviated information that should be reviewed before operating the instrument.
Page 9 Direction Shift/local key display display key Figure 2-1 TH1952 Front Panel Function keys Select measurement function: DC voltage (DCV)/ DC current (DCI), AC voltage (ACV) /AC current (ACI), resistance (Ω)/continuity ( )/diode( ), temperature (Temp)/ frequency (Freq), capacitance/ dB, AC+DC/dBm.
Page 10: Annunciators On Screen
Shift Select 4 1/2 display. Shift Select 5 1/2 display. Menu operation keys Shift Open/Close menu → Move through selections within menu level, command level or parameter level Move through selections within menu level, command level or parameter level. Move up a level. Move down a level.
Page 11: Front Panel Menu Reference
2.2.2 Front Panel Menu Reference A：MATH MENU 1: HI LIMIT Set the high limit for limit testing 2: LO LIMIT Set the low limit for limit testing 3: PERC REF Set the reference value for PERCENT function 4: dB REF Set the dB reference voltage value 5: dBm REF Set the dBm reference impedance value.
Page 12: Front Panel Menu Overview
2.2.3 Front Panel Menu Overview The menu is organized in a top-down tree structure with three levels (menus, commands and parameters) as shown in Figure 2-3. You can use down ( ) or up ( ) to move menu tree from one level to another.
Page 13: Rear Panel Summary
Rear Panel Summary The rear panel of TH1952 is shown in Figure 2-4. This section includes important information that should be reviewed before operating the instrument. Figure 2-4 TH1952 Rear Panel 1. HANDLER interface Use a standard DB-9 hole-type connector. Use external signal to trigger test 2.
Page 14: Power Up
2.4.1 Power Line Connection Follow the procedure below to connect the TH1952 to line power and turn on the instrument. Check to make sure that the line voltage is in the range of 110V/220V±10% and line frequency is in the range of 50Hz/ 60Hz±5%) before connecting the power cord.
Page 15: High Energy Circuit Safety Precautions
500V peak. Exceeding this value may cause a breakdown in insulation, creating a shock hazard. 2.4.4 Power-on Defaults Model TH1952 uses the factory default settings for the power-on settings. Since the basic measurement procedures in this manual assume the factory defaults, reset the...
Page 16 instrument to the factory settings when following step-by-step procedures. Table below lists the factory default settings. Setting Factory Default Function Rang Auto Range Rate FAST Remote/Local Local Trigger Mode Immediate Relative Mode Compare Mode Hi Limit Lo Limit Percent Mode Reference Max/Min Mode Reading Hold...
Page 17: Chapter 3 Basic Measurements
Chapter 3 Basic Measurements Preparation One of the first things you would like to do with your multimeter is to become acquainted with its front panel. We have provided some exercises in foregoing chapters about preparations for use and operations of front panel. The front panel has six rows of keys to select various functions and operations.
Page 18: Measuring Current
RMS value. Waveform Crest factor CF AC RMS AC+DC RMS Table 3-1 Crest factor of some AC signal waveform Measuring Current Model TH1952 current measurement range: 1mA, 10mA, 100mA, 1A, 10A Maximum resolution: 10nA (on 1mA range)
Page 19 Select the desired measurement function. select select ACI+DCI select NOTE: is effective when the current measurement function is current measurement. Connection manner If the current is less than 120mA, connect test leads to the sources as shown in Figure 3-2. If the current is larger than 120mA, connect test leads to the sources as shown in Figure 3-3.
Page 20: Measuring Resistance
Table 3-2 Sampling resistance of current measurement range Crest factor Refer to the crest factor of voltage. Measuring Resistance Model TH1952 Resistance measurement range: 100Ω, 1kΩ, 10kΩ, 100kΩ, 1MΩ, 10MΩ, 100MΩ; Maximum resolution: 1mΩ (on 100Ω range) 1. Select the desired measurement function. select 2.
Page 21: Measuring Continuity
Measuring Continuity  Connection manner Connect test leads to the sources the same as resistance measurement connections.  Entering to the measurement function If the current test function is DCR measurement, press If the current test function is not DCR measurement, press two times.
Page 22: Measuring Frequency
The capacitance measurement ranges from 1nF to 10000µF with the maximum resolution ratio up to 1pF. TH1952 adopts DC constant current charge test. The capacitance is calculated by measuring the voltage change (△V) in a extremely short time (△t). The measurement period includes two sections: charging stage and discharging stage.
Page 23: Dbm Calculation
1mW reference. With user-programmable reference impedance, Model TH1952 reads 0dBm when the voltage needed to dissipate 1mW through the reference impedance is applied. The relationship between dBm, reference impedance, and the voltage...
Page 24: Percent
Method 2: Press to enter into the menu setup interface. Shift keys to select the menu A:MATH MEU. key to enter into the next level menu and then use to select 5:dBm REF. key to enter into the parameter setup interface. Factory setting: 75Ω. keys to enter the data.
Page 25: Mx+B
5. Use keys to enter the data. Use key to save the data and press key to cancel the current data. 6. Press for percent math operation and the present percent value is displayed in the Shift primary display and the current measurement result is displayed in the secondary display. Notes: 1.
Page 26 When enabling Min/Max operation, press key, the Max, Min, Avg and Num value will be displayed in the secondary display. The count value is displayed as integer before the maximum display is reaching 120000. Otherwise, the scientific notation format is displayed. Application method: 1.
Page 27: Chapter 4 Measurement Options
Chapter 4 Measurement Options This chapter provides more in-depth description of features of TH1952. This chapter is organized as follows:  Measurement Configuration – Describes Range, Relative readings, Digits of Resolution and Measurement rate Triggering operations – Explains trigger sources ...
Page 28: Relative Operation
The relative operation could be used to null offsets or subtract a baseline reading from present and future readings. When relative function is enabled, Model TH1952 uses the present reading as a relative value. Subsequent readings will be the difference between the actual input value and the relative value.
Page 29: Trigger Operations
2. Use keys to select C:SYS MEU. 3. Use key or key to enter into the next menu. 4. Use keys to select 7：5 /4 . 5. Use key or key to enter into the parameter setting. 6. Use keys to select PLACE：4 or PLACE：5 . 7.
Page 30: Measurement Sample
Event detection is satisfied for both kinds of triggers as below: 1. A bus trigger (*TRG) command is received. Trig 2. The front panel key is pressed (TH1952 must be taken out of remote before it will Trig respond to key).
Page 31: External Trigger
keys to setup the parameters and press to save the setup. 4.2.4 External trigger BUS trigger: use RS232C or USB bus control to trigger the instrument. EXT trigger: use START signal pin in HANDLER interface to trigger the instrument. Limit Operations Limit operations set and control the values that determine the HI / IN / LO status of subsequent measurements.
Page 32: System Operations
4.4.2 Key Sound To avoid mis-operation, Model TH1952 has key sound function and you can enable or disable it. Factory default setting is enabled. The key sound state is stored in non-volatile memory and does not change when power has been off of after a reset.
Page 33: Calibration
4.4.4 Calibration To make sure the instrument could achieve the designed performance, re-calibration and verification is required at least once a year. Instrument calibration could be performed either via the calibration menu from the front panel or through a remote control interface. The calibration criterion is FLUKE5520A.
Page 34: Chapter 5 Remote Operation
TH1952’s serial port uses the transmit (TXD), receive (RXD), and signal ground (GND) lines of the RS232 standard. It does not use the hardware handshaking lines CTS and RTS. TH1952 only uses the smallest subset of the RS232C standard, the signal are listed in Table 5-2.
Page 35: Rs-232 Interface Operation
Pin 4 and 6, pin 7 and 8 are shorted respectively at the end of controller. B. Sending and receiving data Model TH1952 transfers data using 8 data bits, 1 stop bit, and no parity. Each program message that is transmitted to the controller is terminated with <LF>.
Page 36 Before you choose a baud rate, make sure the programming terminal that you are connecting to the TH1952 can support the baud rate you selected. Both the multimeter and the other device must be configured for the same baud rate.
Page 37: Usb Interface
The instrument is communicating through USB simulated Virtual Serial Port. Before using it, please install the driver in PC. Also, the baud rate is needed to be set. Handler Interface For convenience of industrial manufacture, TH1952 is provided with Handler interface. The interface definition is as follows:...
Page 38 Signal Code External trigger signal START Sorting signal 1 Sorting signal 2 Sorting signal 3 Fail signal FALL Measurement end signal Internal voltage IN_VCC External ground EXT_GND External power EXT_VCC Handler is mainly used under Limit function. Each signal is described as follows: Signal Description START...
Page 39 START signal: Low level valid pulse signal can trigger the multimeter. If using this signal to trigger, the trigger mode must be set as EXT. The time width of low level should not be less than 2μs. EOC signal: Low level valid pulse signal. When one measurement is ended, EOC outputs a low level pulse signal. The time width of this signal should be larger than 1μs.
Page 40: Chapter 6 Scpi Command Reference
SCPI Command Reference Command structure TH1952 command system adopts SCPI commands. The SCPI commands are tree structured three levels deep. (The highest level commands are called the subsystem commands in this manual.) So the lower level commands are legal only when the subsystem commands have been selected. A colon (:) is used to separate the higher level commands and the lower level commands.
Page 41 These brackets indicate that :UPPer is optional and does not have to be used. Thus, the above command can be sent in one of the two ways below: :RANGe <n> :RANGe:UPPer <n> NOTICE: When using optional command words in your program, do not include the brackets.
Page 42: Short-Form Rules
:CURRent[:DC]:NPLCycles 1 :CURRent[:DC]:NPLCycles DEFault :CURRent[:DC]:NPLCycles MINimum :CURRent[:DC]:NPLCycles MAXimum :CURRent[:DC]:NPLCycles PLAC4 :CURRent[:DC]:NPLCycles PLAC5 6.2.2 Short-form Rules Use the following rules to determine the short-form version of any SCPI command:  If the length of the command word is four letters or less, no short form version exists. Example: :AUTO =:AUTO ...
Page 43: Multiple Command Rules
●TRIGer ●FETCh ●CAPacitance ●SPEED ●RETURN Model TH1952 supports following common commands: ◆ *RST ◆ *TRG ◆ *IDN 6.3.1 DISPlay subsystem The DISPlay subsystem commands are mainly used to control the display of the TH1952. and are summarized in Table 6-1.
Page 44 Table 6-1 DISPlay Subsystem Commands Summary Command Function Description :DISPlay Display control command :ENABle Enable or disable front panel dispaly :ENABle? Query state of the display :DISPlay :ENABle Command syntax: :DISPlay:ENABle Command Parameter: = 0 or OFF Disable front panel display 1 or ON Enable front panel display...
Page 45: Function Subsystem
6.3.2 FUNCtion subsystem The commands in this subsystem are used to configure the measurement function subsystems and are summarized in Table 6-2. Table 6-2 FUNCtion Subsystem Commands Summary Command Command Description Select measurement function ： ‘VOLTage:AC’, ‘VOLTage:DC’, :FUNCtion <name> ‘RESistance’, ‘FRESistance’, ‘CURRent:AC’, ‘CURRent:DC’, ‘FREQuency’, ‘PERiod’, ‘DIODe’, ‘CONTinuity’, ’CAPacitance’, ‘TEMPerature’.
Page 46: Function2 Subsystem
6.3.3 FUNCtion2 subsystem The commands in this subsystem are used to configure the second measurement function subsystems and are summarized in Table 6-3. Table 6-3 FUNCtion 2 Subsystem Commands Summary Command Command Description :FUNCtion 2 <name> Select measurement function ： ‘VOLTage:AC’, ‘VOLTage:DC’, ‘CURRent:AC’, ‘CURRent:DC’, ‘FREQuency’...
Page 47: Calculate Subsystem
Command parameter: <name> = Set the measurement units as V Set the measurement units as dB Set the measurement units as dBm Query: :UNIT? Query the current measurement units NOTE: this command is only valid when in DCV, ACV, AC+DC, V function measurement. 6.3.5 CALCulate subsystem The commands in this subsystem are used to configure and control the calculate subsystems and are...
Page 48 :STATe? Query state of limit test :FAIL? Query test result (1=pass, 0=fail) :CALCulate[1] Use these commands to configure and control MXB and percent math calculations. :FORMat <name> Command syntax: :CALCulate[1]:FORMat <name> Command Parameter: <name> = NONE No calculations Polynomial math calculation PERCent Percent math calculation Query:...
Page 49 Query: :MBFactor? Query “b” factor Description: This command is used to define the “b” factor for the mx+b calculation. :PERCent <NRf> Command syntax: :CALCulate[1]:KMATh:PERCent <NRf> Command Parameter: <NRf> = -1e6 to1e6 Specify target value. Query: :PERCent? Query percent target value Description: This command is used to specify the target value for the percent calculation.
Page 50 Description: This query command is used to read the result of the CALC1 calculation. If CALC1 is disabled or NONE is selected, the “raw” reading will be read. :CALCulate2 These commands are used to configure and control the CALC2 operations on readings stored in the buffer.
Page 51 :DATA? Command syntax: :CALCulate2:DATA? Description: This query command is used to read the result of the CALC2 calculation. If CALC2 is disabled or NONE is selected, the “raw” reading will be read. :CALCulate3 These commands are used to configure and control the CALC3 limit test. Specify upper limit :LIMit[1]:UPPer <n>...
Page 52: Voltage Subsystem
Description: This command is used to enable or disable the LIMIT test. When enabled, the limit test will be performed. :FAIL? Command syntax: :CALCulate3:LIMit[1]:FAIL? Description: This command is used to read the results of the LIMIT1 test 0 = Limit test failed 1 = Limit test passed The response message (0 or 1) only tells you if a limit test has passed or failed.
Page 53 :VOLTage:AC Path to configure AC voltage :NPLCycles <n> Set the test speed and display digits SLOW :NPLCycles? Query line cycle integration rate :RANGe Path to set measurement range [:UPPer] <n〉 Select range (0 to 757.5) 757.5 [:UPPer]? Query range :AUTO Enable or disable auto range :AUTO? Query auto range...
Page 54 Command Parameter: <n> = (0.1,1,10,100,750) V (0.1,1,10,100,1000)V DEFault 0.1(ACV) 0.1 (DCV) MINimum MAXimum 750(ACV) 1000(DCV) Query: :RANGe[:UPPer]? Query measurement range of the current function. Description: This command is used to manually select the measurement range for the specified measurement function. The range is selected by specifying the expected reading as an absolute value. The instrument will then go to the most sensitive range that will accommodate that expected reading.
Page 55 Command parameter: <n> = -757.5 to 757.5 Reference for ACV -1010 to 1010 Reference for DCV DEFault 0 (All measurement functions) MINimum Mininum value for specified function MAXimum Maximum value for specified function Query: :REFerence? Query reference for relative function Descripton: These commands are used to establish a reference value for the specified function.
Page 56 :VOLTage:DC:REFerence:ACQuire Acquire reference for DCV Description: When one of these commands is sent, the measurement input signal is acquired and established as the reference value. This command is typically used to zero the display. For example, if the instrument is displaying a 1μV offset, sending this command and enabling Reference zeroes the display.
Page 57: Current Subsystem
6.3.7 CURRent subsystem The commands in this subsystem are used to configure and control current measurement function and are summarized in Table 6-7. Table 6-7 CURRent Subsystem Commands Summary Command Function Description Default :CURRent:DC Path to configure DC current :NPLCycles <n> Set the test speed and display digits SLOW, PLAC5 :NPLCycles?
Page 58 DEFault SLOW SLOW Set the test speed as SLOW FAST Set the test speed as FAST PLAC4 Set the display digits as 4 1/2 PLAC5 Set the display digits as 5 1/2 Query: :NPLCycles? Query the current test speed Description: The command is used for the basic measurement functions (except Frequency and Period) and test speed (display digits).
Page 59 Description: These command are used to control auto ranging. With auto ranging enabled, the instrument automatically goes to the most sensitive range to perform the measurement. The auto range command (:RANGe:AUTO) is coupled to the command that manually selects the measurement range (:RANGe <n>).
Page 60 : CURRent:DC:REFerence:STATe Control reference for DCI Command parameter: = 1 or ON Enable reference 0 or OFF Disable reference Query: :STATe? Query state of reference. Description: These commands are used to enable or disable Reference for the specified function. :ACQuire Command syntax: : CURRent:AC:REFerence:ACQuire...
Page 61: Resiister Subsystem
6.3.8 RESIister subsystem The commands in this subsystem are used to configure and control resistance measurement function and are summarized in Table 6-8. Table 6-8 RESIister Subsystem Commands Summary Command Function Description Default :RESistance Path to configure resistance :NPLCycles <n> Set the test speed and display digits SLOW, PLAC5 :NPLCycles?
Page 62 :RANGe Commands :[UPPer] <n> Command syntax: :RESistance:RANGe[:UPPer] <n> Set measurement range for Ω Command Parameter: <n> = (100,1k,10k,100k,1M,10M,100M) Ω Expected reading is ohms DEFault 100 (Ω) MINimum MAXimum 100M Query: :RANGe[:UPPer]? Query measurement range of the current function. Description: This command is used to manually select the measurement range for the specified measurement function.
Page 63 :RESistance:REFerence <n> Specify reference for Ω Command parameter: <n> = Reference for Ω 0~10e6 DEFault MINimum Mininum value for specified function MAXimum Maximum value for specified function Query: :REFerence? Query reference for relative function Descripton: These commands are used to establish a reference value for the specified function. When reference is enabled (:REFerence:STATe), the result will be the algebraic difference between the input signal and the reference value: Reading = Input signal –...
Page 64: Frequency And Period Subsystem
the reference value. This command is typically used to zero the display. For example, if the instrument is displaying a 0.1Ω offset, sending this command and enabling Reference zeroes the display. This command is functional only if the instrument is on the specified measurement function. Sending this command while in any other function causes an error.
Page 65 :REFerence <n> Commands :REFerence <n> Command syntax: :FREQuency:REFerence <n> Specify reference for FREQ Command parameter: <n> = 0 to 1.0e6 Reference for FREQ DEFault 0 (All measurement functions) MINimum Mininum value for specified function MAXimum Maximum value for specified function Query: :REFerence? Query reference for relative function...
Page 66: Capacitance Subsystem
:ACQuire Command syntax: :FREQuency:REFerence:ACQuire Acquire reference for FREQ Description: When one of these commands is sent, the measurement input signal is acquired and established as the reference value. This command is typically used to zero the display. For example, if the instrument is displaying a 10Hz offset, sending this command and enabling Reference zeroes the display.
Page 67 :RANGe Commands :[UPPer] <n> Command syntax: :CAPacitance:RANGe[:UPPer] <n> Set measurement range for capacitance Command Parameter: <n> = 1n,10n,100n,1u,10u,100u,1000u,10000u) Expected reading is F DEFault MINimum MAXimum 10000uF Query: :RANGe[:UPPer]? Query measurement range of the current function. Description: This command is used to manually select the measurement range for the specified measurement function.
Page 68 :CAPacitance:REFerence <n> Specify reference for capacitance Command parameter: <n> = 0~10000uF Reference for capacitance DEFault MINimum Mininum value for specified function MAXimum Maximum value for specified function Query: :REFerence? Query reference for relative function Descripton: These commands are used to establish a reference value for the specified function. When reference is enabled (:REFerence:STATe), the result will be the algebraic difference between the input signal and the reference value: Reading = Input signal –...
Page 69: Hold Subsystem
the reference value. This command is typically used to zero the display. For example, if the instrument is displaying a 0.1Ω offset, sending this command and enabling Reference zeroes the display. This command is functional only if the instrument is on the specified measurement function. Sending this command while in any other function causes an error.
Page 70: Trigger Subsystem
Query: :COUNt? Query HOLD count. Descripton: This command is used to specify the count for HOLD. COUNt is the number of readings that are compared to the “seed” reading during the HOLD process. :STATe Command syntax: :HOLD:STATe Command Parameter: ...
Page 71: Fetch Subsystem
Triggered by Handler inetreface Query: :SOURce? Query control source Description: These are used to select the event control source. 6.3.13 FETCH Subsystem FETCh? Command Command syntax: :FETCh? Description: This query command is used to obtain the lastest post-processed reading. This command does not affect the configuration of the instrument.
Page 72: Return Subsystem
5 +SLOW = SLOW 6.3.15 RETURN Subsystem :RETURN < > set the return function as ON set the return function as OFF Function: Set the bus command response function as ON/OFF. Instruction: when verifying the return function, only sending one command without return data can confirm whether the function is ON.
Page 73: Common Commands
Common commands can be used to all equipments. We provide some common commands as below: *RST Command Syntax: *RST Description: Reset the instrument *TRG Command Syntax: *TRG Description: Trigger the instrument for measurement *IDN? Query Syntax: *IDN? Query return: <product>,<version><LF^END> Here: <product> TH1952 Digital Multimeter <version> Ver1.0 Description: Query information returned to instrument.

Tonghui TH1952 Operation Manual

Chapter 1 General Information

Chapter 2 TH1952 Overview

Chapter 3 Basic Measurements

Chapter 4 Measurement Options

Chapter 5 Remote Operation

Chapter 6 SCPI Command Reference

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