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OPERATION MANUAL

TH1952

Digit Multimeter

Changzhou Tonghui Electronic Co., Ltd.

www.tonghui.com.cn

Summary of Contents for TH1952

Page 1: ...OPERATION MANUAL TH1952 51 2 Digit Multimeter Changzhou Tonghui Electronic Co Ltd www tonghui com cn...

Page 2: ...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 func...

Page 3: ...ction 14 2 4 2 Input Terminals 14 2 4 3 High Energy Circuit Safety Precautions 15 2 4 4 Power on Defaults 15 Chapter 3 Basic Measurements 17 3 1 Preparation 17 3 2 Measuring Voltage 17 3 3 Measuring C...

Page 4: ...nce 40 6 1 Command structure 40 6 2 Command Syntax 40 6 2 1 Commands and command parameters 40 6 2 2 Short form Rules 42 6 2 3 Basic Rules of Command Structure 42 6 2 4 Multiple Command Rules 43 6 2 5...

Page 5: ...V to 750V RMS DC current from 10nA to 12A AC current from 10nA to 12A AC DC current from 10nA to 12A RMS Resistance measurement from 1m to 100M Frequency from 1Hz to 1MHz Some additional capabilities...

Page 6: ...at hazards could damage the instruments if not according to operating instructions Such damage may invalidate the warranty 1 5 Incoming Inspection The TH1952 was carefully inspected mechanically and e...

Page 7: ...l 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 REM...

Page 8: ...nvenient test platform features High brightness VFD dual display Built in arithmetical operation function Short and diode test function Manual setup of reading hold function Portable shape design Flex...

Page 9: ...elected tolerance 4 Shift Local keys Shift Used to access shifted keys Shift LOCAL Cancel RS232C remote control mode and back to the LOCAL mode 5 2nd Display key Control the secondary parameter displa...

Page 10: ...LD Reading HOLD function is enabled REL Relative reading displayed MnMx Data statistics function is enabled Rmt Remote operation is in progress mX b Coefficient adjustment mX b function is enabled Cap...

Page 11: ...HOLD WIN Set the reading hold sensitivity band 3 HOLD CNT COUNT of readings for reading hold 4 RDGS STOR Data storage function is enabled 5 RDGS COUN Set the data storage number 6 SCAN RDGS Scan the...

Page 12: ...ree 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 Each of the three levels has several horizontal choices which you can...

Page 13: ...r for RS 232 operation 3 USB interface Use a USB B square connector Use USB wire to make remote operation 4 Grounding Chassis Grounding terminal 5 Label Serial number for this instrument 6 Power Line...

Page 14: ...on the rear panel Connect the other end of the power cord to a grounded AC outlet WARNING The power cord supplied with the Model TH1952 contains a separate ground wire for use with grounded outlets Wh...

Page 15: ...se voltage spacing This diminishes arc protection and creates a hazardous condition Use the following sequence when measuring high energy circuits 1 De energize the circuit using the regular installed...

Page 16: ...tory default settings Setting Factory Default Function DCV Rang Auto Range Rate FAST Remote Local Local Bit 5 Trigger Mode Immediate Relative Mode OFF Compare Mode OFF Hi Limit 1 Lo Limit 1 Percent Mo...

Page 17: ...e it For example to select the AC current function press Shift then press AC V ACI If you accidentally press Shift just press it again to turn off the Shift annunciator 3 2 Measuring Voltage Voltage r...

Page 18: ...possible range for the best resolution 5 Internal resistance of voltage measurement DCV input impedance 10 M 1000V 10V range 10G 1V 100mV range CAUTION Maximum Input voltage 1010VDC ACV Input Impedan...

Page 19: ...asurement Connections 3 Range selection and switch Press toggles auto ranging Notice the AUTO annunciator is displayed with auto ranging If you want manual ranging use the RANGE and keys to select a m...

Page 20: ...d with auto ranging If you want manual ranging use the RANGE and keys to select a measurement range consistent with expected resistance 4 How to acquire more accurate measurement results If the OVL D...

Page 21: ...iode Connection manner Connect test leads to the sources the same as resistance measurement connections Entering to the measurement function Beeper under conducting state The multimeter alerts you wit...

Page 22: ...ions charging stage and discharging stage Basic operation Connect the test leads to the sources the same as voltage measurement Press key to enter into the capacitance measurement function In order to...

Page 23: ...it is mV 1 00000 means 1V 100 000m means 100mV 3 The dB calculation takes the absolute value of the ratio VIN VREF 4 The largest negative value of dB is 160dB 3 10 2 dBm Calculation dBm is defined as...

Page 24: ...rcent calculation is selected a reference value must be specified The displayed reading will be expressed as percent deviation from the reference value The percentage calculation is performed as follo...

Page 25: ...the b value is displayed 3 Press key to enter into the edit interface when displaying the m value and b value 4 Use keys to enter the data Use key to save the data and press key to cancel the current...

Page 26: ...g 120000 Otherwise the scientific notation format is displayed Application method 1 Press key to enter into the Max Min math function The measurement result is displayed in the primary display and the...

Page 27: ...r you can use manual ranging for faster measurements since the multimeter doesn t have to determine which ranging to use for each measurement The multimeter returns back to auto ranging when power has...

Page 28: ...ecomes the reference value Subtracting the offset from the actual input zeroes the display as follows Displayed reading Actual Input Reference Note Select a range that cannot accommodate the relative...

Page 29: ...xplained as follows Digit Fast Slow 5 15 4 4 100 15 Note The integration time can be set for any measurement function except frequency period continuity FAST and diode test Medium For frequency and pe...

Page 30: ...processed it is checked to see if it is within the selected window 0 01 0 1 1 and 10 of the seed reading If the reading is within the window operation again loops back within the measurement sample bl...

Page 31: ...range Application method Method 1 1 Press Shift key to enter the Limit measurement function 2 Press key and the Hi value is displayed in the secondary display The initial value is 1 00000 press key ag...

Page 32: ...ect 2 BEEP STAT 3 Use or key to enter into the parameter setting interface 4 Use or key to select ON or OFF and press to save the setup 4 4 2 Key Sound To avoid mis operation Model TH1952 has key soun...

Page 33: ...e calibration criterion is FLUKE5520A The CAL MENU can be used to view the calibration date to view the number of times calibration has been performed and to perform calibration Some of the items are...

Page 34: ...RS232 stands for Recommend Standard number 232 and C is the latest revision of the standard The common RS232 signals are listed in Table 5 1 Table 5 1 Signal Definition Signal Code 25 Pin Connector P...

Page 35: ...the connection cable by yourself according the diagram or order one from our company Note Pin 4 and 6 pin 7 and 8 are shorted respectively at the end of controller B Sending and receiving data Model...

Page 36: ...erial interface is not connected correctly Check if the same baud rate is selected for both TH1952 and the controller When TH1952 is busy with executing a bus command TH1952 will not accept any charac...

Page 37: ...White 2 Data high terminal Data Green 3 Grounding GND Black 4 This instrument uses square type socket and the pin sequence is as follows This instrument uses USB B type interface 5 2 2 USB Communicat...

Page 38: ...tput FALL When the measurement result is lower than LO this signal is low level or high level is output EOC Measurement end signal The low output signal will be valid IN_VCC Internal power output sign...

Page 39: ...g this signal to trigger the trigger mode must be set as EXT The time width of low level should not be less than 2 s EOC signal Low level valid pulse signal When one measurement is ended EOC outputs a...

Page 40: ...ple Figure 6 1 Command Tree Example 6 2 Command Syntax The information in this section covers the syntax for both common commands and SCPI commands 6 2 1 Commands and command parameters Common command...

Page 41: ...le or disable an instrument operation 0 or OFF disables the operation and 1 or ON enables the operation Example CURRent AC RANGe AUTO ON Enable auto ranging name Name parameter Select a parameter name...

Page 42: ...a consonant retain it but drop all the letters after it Example format form If the command contains a question mark query or a non optional number included in the command word you must include it in t...

Page 43: ...begin with the root command unless it is optional e g FUNCtion If the root is optional simply treat a command word on the next level as the root The colon at the beginning of a program message is opt...

Page 44: ...ter b 0 or OFF Disable front panel display 1 or ON Enable front panel display Query ENABle Query state of the display Description This command is used to enable or disable front panel display circuitr...

Page 45: ...nt CURRent DC Select DC Current RESistance Select 2 wire Resistance FRESistance Select 4 wire Resistance FREQuency Select Frequency PERiod Select Period DIODe Select Diode Testing CONTinuity Select Co...

Page 46: ...VOLTage AC Select AC Voltage VOLTage DC Select DC Voltage CURRent AC Select AC Current CURRent DC Select DC Current FREQuency Select Frequency Query FUNCtion2 Query currently second programmed functi...

Page 47: ...DATA CALCulate3 LIMit 1 UPPer n UPPer LOWer n LOWer STATe b Subsystem to control CALC1 Select math format NONE MXB PERCent Query math format Path to configure math calculations Set m factor for mx b 1...

Page 48: ...he format for the CALC1 math calculations With NONE selected no CALC1 calculation is performed With MXB or PERCent selected and enabled the result of the calculation is displayed The calculated readin...

Page 49: ...ire Command syntax CALCulate 1 KMATh PERCent ACQuire Description This action command is used to acquire the present input signal reading and use it as the target value for the PERCent calculation STAT...

Page 50: ...ogrammed math format Description This command is used to specify the format for the CALC2 math calculation The calculation operations for CALC2 use data stored in the buffer With NONE selected no CALC...

Page 51: ...Specify lower limit to 1 MINimum Specify limit to 100e6 MAXimum Specify limit to 100e6 Query UPPer Query upper limit LOWer Query lower limit Description This command is used to specify the upper and l...

Page 52: ...em are used to configure and control voltage measurement function and are summarized in Table 6 6 Table 6 6 VOLTage Subsystem Commands Summary Command Function Description Default VOLTage DC NPLCycles...

Page 53: ...OFF Speed Commands NPLCycles n Command Systax VOLTage AC NPLCycles n Set NPLC for ACV VOLTage DC NPLCycles n Set NPLC for DCV Command Parameter n SLOW FAST PLAC4 PLAC5 Set the test speed and digit di...

Page 54: ...auto range for ACV VOLTage DC RANGe AUTO b Set auto range for DCV Command parameter b 1 or ON Enable auto range 0 or OFF Disable auto range Query AUTO Query auto range ON or OFF Description These com...

Page 55: ...ent REFerence n or ACQuire eatablishes the reference When a reference is set using the REFerence n command the REFerence Query command returns the programmed value Conversely when a reference is set u...

Page 56: ...to zero the display For example if the instrument is displaying a 1 V offset sending this command and enabling Reference zeroes the display This command is functional only if the instrument is on the...

Page 57: ...able reference Query state of reference Use input signal as reference Query reference value SLOW PLAC5 20 ON 0 OFF CURRent AC NPLCycles n NPLCycles RANGe UPPer n UPPer AUTO b AUTO REFerence n STATe b...

Page 58: ...ent range for ACI CURRent DC RANGe UPPer n Set measurement range for DCI Command Parameter n 1m 10m 100m01 10 A ACI 1m 10m 100m01 10 A DCI DEFault 1mA ACI DCI MINimum 1mA All functions MAXimum 10A Que...

Page 59: ...ference for ACI DEFault 0 All measurement functions MINimum Mininum value for specified function MAXimum Maximum value for specified function Query REFerence Query reference for relative function Desc...

Page 60: ...e for DCI 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...

Page 61: ...100k 1M 10M 100M Query range Enable or disable auto range Query auto range Specify reference 0 to 20e6 Enable or disable reference Query state of reference Use input signal as reference Query referen...

Page 62: ...able auto range 0 or OFF Disable auto range Query AUTO Query auto range ON or OFF Description These commands are used to control auto ranging With auto ranging enabled the instrument automatically goe...

Page 63: ...to the ACQuire command The last command sent REFerence n or ACQuire eatablishes the reference When a reference is set using the REFerence n command the REFerence Query command returns the programmed...

Page 64: ...system Commands Summary Command Function Description Default FREQuency THReshold VOLTage RANGe n RANGe REFerence n STATe b STATe ACQuire REFerence Path to configure frequency Path to select the thresh...

Page 65: ...erence value Reading Input signal Reference From the front panel reference is called relative REL The REFerence n command is coupled to the ACQuire command The last command sent REFerence n or ACQuire...

Page 66: ...t function Sending this command while in any other function causes an error Also if the latest reading is overflowed or a reading has not been triggered an error occurs when this command is sent 6 3 1...

Page 67: ...eter b 1 or ON Enable auto range 0 or OFF Disable auto range Query AUTO Query auto range ON or OFF Description These commands are used to control auto ranging With auto ranging enabled the instrument...

Page 68: ...coupled to the ACQuire command The last command sent REFerence n or ACQuire eatablishes the reference When a reference is set using the REFerence n command the REFerence Query command returns the prog...

Page 69: ...on and are summarized in Table 6 11 Table 6 11 HOLD Subsystem Commands Summary Command Function Description Default HOLD WINDow NRf WINDow COUNt NRf COUNt STATe NRf STATe Path to control Hold feature...

Page 70: ...in this subsystem are used to configure and control trigger measurement function and are summarized in Table 6 12 Table 6 12 TRIGger Subsystem Commands Summary Command Function Description Default TRI...

Page 71: ...a measurement The command simply requests the last available reading This command continues to return the same old reading until there is a new reading This command will be automatically asserted when...

Page 72: ...t the return function as ON OFF 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...

Page 73: ...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 Her...

Page 74: ...74...

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