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UT8805E Benchtop Digital Multimeter

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2.8 Mathematical Functions

5 main functions are included in mathematical operation: statistics, limits, dB, relative operation and dBm.

Different mathematical function satisfies different measuring requirements, which is suitable for voltage,

current, resistance, capacitance, frequency/cycle and temperature measurements. The dB and dBm

operations are only suitable for voltage measurement.

Press

button to enter the operating menu of mathematical operation as Figure 2-41.

Figure 2-41 Interface of mathematical operating function

Mathematical operating function menu

Function menu

Options

Description

Stat

On/Off

Statistics maximum, minimum, average, Span, standard

deviation and samples of current measurement

Limit

Operate the pass/fail test according to the high/low limit

dB

Calculate of measured decibels relative to the reference

value

Relatively

On/Off

Turn the relative operation on/off and set the relative value

dBm

Calculate the power of resistance, 0dBm=1mW

Note:



The mathematical operation can only be processed in primary measurement.



Except for statistic, all the mathematical operations will turn off automatically if the measurement

function is changed.

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Summary of Contents for UT8805E

Page 1: ...English Manual UT8805E Benchtop DigitalMu l t i m e t e r ...

Page 2: ...ight Information Copyright Uni Trend Technology China Co Ltd all rights reserved Trade Mark UNI T is the registered trademark of Uni Trend Technology China Co Ltd Declaration UNI T products are protected by patent rights in China and other countries including issued and pending patents Uni Trend reserves the rights to any product specification and pricing changes Uni Trend reserves all rights Info...

Page 3: ... Please notice rated operating range and product marks Never input over range voltage into any terminal or ground point of this product When measuring do not touch any exposed wires connectors unused inputs or the circuits being measured When measuring the voltage higher than 60V DC or 30V AC keep your fingers behind the finger guard ring of the test leads to prevent electric shock Do not operate ...

Page 4: ...hat of terminal LO To maintain good protection only the specified type and class fuses can be replaced IEC Measurement Category II Overvoltage Protection To avoid shock hazards UT8805E provides overvoltage protection for mains connections that meet both conditions below 1 The input terminals HI and LO are connected to the mains under the measurement class II condition described below 2 The maximum...

Page 5: ...II 300V IEC measurement category II In the case of class II overvoltage the input may be connected to the mains up to 300V AC Terms on the product Following terms may show on the product DANGER indicates any injury hazard immediately accessible as you read the marking WARNING indicates any injury hazard not immediately accessible as you read the marking CAUTION indicates any damage may happen to t...

Page 6: ...oltage range True RMS 2mA 10A AC current range 200Ω 100MΩ resistance range 2 line and 4 line resistance measurement 2nF 2000μF capacitance range 20Hz 1MHz frequency range Continuity and diode test Temperature measurement with built in thermocouple cold junction compensation Various mathematic operations maximum minimum average value standard deviation pass fail dBm dB relative measurement histogra...

Page 7: ...rent Measurement 18 2 3 5 2 wire 4 wire Resistance Measurement 19 2 3 6 Frequency Measurement 21 2 3 7 Signal Cycle Measurement 22 2 3 8 Continuity Test 23 2 3 9 Diode Measurement 24 2 3 10 Temperature Measurement 25 2 4 Relative Measurement Parameters 27 2 4 1 DC Input Impedance 27 2 4 2 Short circuit Resistance 27 2 4 3 Dual Display Function 28 2 5 Auxiliary System Functions 28 2 5 1 I O Configu...

Page 8: ...apter 3 Practical Cases 44 3 1 Readings Statistics 44 3 2 Elimination of Test Leads Impedance Error 45 3 3 DBm Measurement 45 3 4 dB Measurement 46 3 5 Limit Test 46 3 6 Hold Measurement 47 3 7 Thermocouple Setting and Measurement 47 Chapter 4 Measurement Guide 49 4 1 True RMS AC Measurement 49 4 2 Crest Factor Error Non sinusoidal Input 49 4 3 Load Error AC Voltage 50 Chapter 5 Trouble Shooting 5...

Page 9: ...ve office immediately if any abnormality is found 2 Accessories checking The accessories list is provided in appendix A of chapter 6 User can check refer to this list Contact distributor or local representative office immediately if any accessory is missing or damaged 3 Complete instrument checking Contact distributor or local representative office immediately if any abnormal operation or appearan...

Page 10: ...t interface F Range selector and direction buttons C Power switch G Input interfaces D Menu operating buttons 1 4 Rear Panel Various interface are provided by UT8805E includes USB Device RS 232C LAN GPIB optional and so on as shown in figure Figure 1 5 Rear panel A Current measurement fuse G LAN interface B Lockhole H AC voltage selector C VMC output I RS 232C interface D External trigger input J ...

Page 11: ...Hz AC 2 Connect the multimeter with AC current by random power line 3 Observe the power indicator on front panel turns red 4 Long press the power button for a few second till the multimeter displays picture Note the items in are F1 F6 soft key menu items 1 6 User Interface Single screen Figure 1 6 Interface of single screen mode Dual screen Figure 1 7 Interface of dual screen mode Trigger method R...

Page 12: ...liary system utility Acquire setting or help system Mathematical operation or save Run stop exit function Manual trigger or hold function Shift function switch Auto manual range selector Range selector and direction buttons Menu operating buttons Power switch 2 1 Range Selection Both auto range and manual range can be selected The multimeter can automatically select proper range according to the i...

Page 13: ...range by 20 3 When the instrument is powered on remotely reset and started with the factory settings auto range is selected by default 4 It is suggested that users should choose auto range in case of unpredictable measuring range to protect the instrument and obtain accurate data 5 For the dual display function the ranges of both screens are similar and cannot be changed separately 6 The ranges ar...

Page 14: ...eading s is corresponding to 5 5 bits reading resolution 5 Temperature measurement is corresponding to 5 5 bits reading resolution slow speed 6 Diode continuity measurement is corresponding to 4 5 bits reading resolution medium speed 7 Frequency measurement is corresponding to 5 5 bits reading resolution and the reading speed depends on the input signal frequency 8 Capacitance measurement is corre...

Page 15: ...ill show if input voltage exceeds 1050V 1000V input protection is provided in arbitrary ranges 4 DC input impedance setting only for scales of 20V and below There are two options of input impedance Auto and 10M For scales of 20V and below Auto means the input impedance is over 10GΩ otherwise the input impedance is 10MΩ 5 Relative value setting Turn the relative operation on the displayed value is ...

Page 16: ... Input LO Figure 2 7 Connection of DC voltage measurement 3 Select proper range according to input current Range 200μA 2mA 20mA 200mA 2A 10A Input protection 250mA overcurrent protection for 200mA range rear panel 10A built in overcurrent protection for the ranges of 2A and 10A Configurable parameters Range reading speed relative operation set value Note Except for 10A all ranges are allowed to ex...

Page 17: ... 3 Select proper range according to the input AC voltage Range 200mV 2V 20V 200V 750V Input protection DC 1000V or AC 750Vrms terminal HI for all ranges Configurable parameters Range reading speed relative operation set value Note Except for 750V all ranges are allowed to exceed range by 20 In 750V range OL shows when input exceeds 787V 750Vrms input protection is provided in arbitrary ranges 4 Re...

Page 18: ...suring 2 Connect the multimeter to the measured circuit as Figure 2 12 When the current is 200mA the red test lead should be connected to terminal mA while the black one should be connected to terminal Input LO When the current is 200mA 10A connect the red test lead to terminal A and connect the black one to terminal Input LO Figure 2 12 Connection of AC current measurement 3 Select proper range a...

Page 19: ...urement Both the 2 wire 4 wire resistance measurement modes are provided by UT8805E The connecting and measurement methods are shown below A 2 wire Resistance Measurement Steps 1 Press button to enter interface of 2 wire resistance measurement as Figure 2 13 Figure 2 13 Interface 2 wire resistance measurement 2 Connect the test leads to the measured resistance as Figure 2 14 connect the red test l...

Page 20: ...he measured resistance is low error will be caused by test lead resistance and contact resistance in circuit Therefore 4 wire measuring mode is necessary for a precise measurement Steps 1 Press button and then press button to enter interface of 4 wire resistance measurement as Figure 2 15 Figure 2 15 Interface of 4 wire resistance measurement 2 Connect the test leads to the measured resistance as ...

Page 21: ...ory data by number bar chart trend chart and histogram Note During resistance measurement please avoid short circuit caused by antistatic rubber copper foil and other conductors and keep away from strong electromagnetic radiation When the input terminal is in dangling state in 4 wire resistance measurement random reading will show 2 3 6 Frequency Measurement Frequency value can be read by turning ...

Page 22: ...The reading speed of frequency measurement depends on the frequency of measured signal 6 History data review User can check the history data by number bar chart trend chart and histogram 2 3 7 Signal Cycle Measurement Frequency value can be read by turning on the dual display function in AC voltage measurement Besides that the same frequency value can be read in frequency measurement The connectin...

Page 23: ...ata review User can check the history data by number bar chart trend chart and histogram 2 3 8 Continuity Test Continuity test uses 2 wire mode to measure the resistance of circuit at a current of 1mA in order to check the integrity of the circuit When the measured resistance value in the short circuit circuit is lower than the set short circuit resistance the circuit is connected and the beeper c...

Page 24: ...on or off If the circuit is connected the beeper will continuously beep 4 Test the testing point and read the displayed value 2 3 9 Diode Measurement Diode measurement uses 2 wire mode to measure the break over voltage of circuit at a current of 1mA The connecting and measurement methods are shown below 1 Press button and then press button to enter interface of diode measurement as Figure 2 25 Fig...

Page 25: ...ment as Figure 2 27 Figure 2 27 Interface of temperature measurement 2 Connect the test leads to the sensor as Figure 2 28 Please be aware of the polarity of thermocouple probe and don t reverse connect Figure 2 28 Connection of temperature measurement 3 Select temperature probe Press Probe to select the probe type RTD 2W RTD 4W Thermis2W Thermis4W and Tcouple The RO value of RTD is 100Ω by defaul...

Page 26: ...asuring interface as Figure 2 17 Figure 2 17 capacitance measuring interface 2 Connect the test leads to the measured capacitance as Figure 2 18 the red test lead to the terminal Input HI and the capacitance anode and the black one to terminal Input LO and cathode Figure 2 16 Connection of 4 wire resistance measurement 3 Select proper range according to the measured capacitance Range 2nF 20nF 200n...

Page 27: ... to enter the following interface Figure 2 29 Interface of input impedance selecting 10MΩ or 10GΩ parameters are selectable Generally 10MΩ is regular used but higher impedance value 10GΩ is recommended to improve the measuring precision for 200mV 2V and 20V ranges Current selection is saved in non volatile memory The default input impedance is 10GΩ for DC voltage 200mV 2V and 20V ranges and 10MΩ f...

Page 28: ...ditional measurement Primary measurement ACV FREQ ACI FREQ FREQ Period ACV Period FREQ ACV Temp thermocouple Input voltage reference temperature Temp thermal resistance Resistance Both primary and additional measurement will display measurement data separately If the primary measurement uses mathematical operations such as statistics limits and relativity primary measurement will remain the result...

Page 29: ...g LAN Setting Remote operation is allowed through LAN interface Users can check or set the current IP address subnet mask and gateway in network setting After opening the operation menu of auxiliary system function setting press I O to open the network and select LAN to enter the following interface as Figure 2 33 and change the setting by direction buttons Figure 2 33 Interface of LAN setting LAN...

Page 30: ... n menu Options Description Baud rate 9600 default 14400 19200 38400 56000 57600 115200 128000 256000 Set baud rate of RS 232C operation Parity None default Odd Even Set parity of RS 232C operation Stop bit 1bit 1 5bit 2bit Set stop bit of RS 232C operation Return Save current setting and return to previous menu When the parity is None the bit of upper computer should be 8 bits Odd even parity the...

Page 31: ...play 4 Format There are three formats of input value none comma and space Take 2V in three formats as an example 2 00000V 2 000 00V and 2 000 00V 5 About Check the system information includes machine model software version hardware version serial number and other information as Figure 2 36 Figure 2 36 system information 2 5 3 Time Setting Press Time to set the time from year to minute by direction...

Page 32: ...ger and external trigger Press button to enter the interface as Figure 2 37 Figure 2 37 Samples acquirement setting Sampling menu description Function menu Options Description Trg Src Auto Single Ext Set trigger source of sample acquirement Slope Set the polarity of external trigger slope Delay Auto Manual Set delay Samples Set the samples number VMC Out Pos Neg Set the polarity of output pulse si...

Page 33: ...ut pulse signal 2 6 3 External Trigger The external signal is accessed by the EXT TRIG pin on rear panel The parameters to be set in external trigger function are samples VMC out and slope Steps 1 Press button and then select Trg Src Ext to turn external trigger function on as Figure 2 39 Figure 2 39 Setting interface of external trigger 2 Select Slope to select positive negative and set external ...

Page 34: ...s to access the measuring function types and the probe connection in different measurements 2 Temperature measurement This is to access the method of temperature measurement 3 Capacitance measurement This is to access the method of capacitance measurement 4 Mathematical functions This is to access the operation guide of using mathematical function in measurement 5 Dual display function This is to ...

Page 35: ...e 2 41 Figure 2 41 Interface of mathematical operating function Mathematical operating function menu Function menu Options Description Stat On Off Statistics maximum minimum average Span standard deviation and samples of current measurement Limit Operate the pass fail test according to the high low limit dB Calculate of measured decibels relative to the reference value Relatively On Off Turn the r...

Page 36: ...The minimum reading during measurements Average The average of readings during measurements Max The maximum reading during measurements Span The span of readings during measurements Std Dev The standard deviation of readings during measurements Samples The number of samples during measurements Clear Clear current data and restart the statistic Done Save current settings and return to previous menu...

Page 37: ...ave current settings and return to previous menu Low Limit Current set low limit High Limit Current set high limit Status Indicate the status of limit operation Pass Fail Low Failures The number of low limit exceeding failures High Failures The number of high limit exceeding failures 1 Limit setting method Select High or Low switch digits by left right direction buttons and modify digits by up dow...

Page 38: ...n or off Resist Can be set by direction buttons in the range of 1Ω 8000Ω Done Save current settings and return to previous menu The operating method of dBm In dBm operation the measured voltage can be transferred to dBm value by formula below dBm 10 x Log10 Reading2 RREF 0 001W 2 8 4 dB Operation dB represents relative value and is applied to the relative operation of dBm The dB operation is only ...

Page 39: ... and will be auto deleted after power off 2 8 5 The Relative Operation The relative operation is applied to relative measurement The reading is the difference between the measuring value and the set value Press Relatively On to enter the interface of Figure 2 46 Figure 2 46 Interface of relative operation Menu of relative operation Function menu Options Description Relatively On Off Turn the relat...

Page 40: ... default Figure 2 47 Number display format 2 9 2 Bar Chart Steps 1 Select Bar to enable bar chart display format Figure 2 48 Bar chart display format 2 Select Scale to set method of horizontal scales to be Default Manual or Limit setting Menu of bar chart manual settings Function menu Description High Set the high limit of horizontal scale Low Set the low limit of horizontal scale Center Set the m...

Page 41: ...Scale Select the setting method of vertical scale Autoscale Once Set vertical scale automatically once Clear Readings Clear current data and restart the statistics Done Save current settings and return to previous menu 2 Press Vertical Scale to set method of vertical scales to be Default Manual or Limit setting Figure 2 50 Trend chart manual setting 2 9 4 Histogram The histogram display measured d...

Page 42: ... function Return Save current settings and return to previous menu 2 Press Setting to enable manual setting mode as Figure 2 51 Figure 2 51 Histogram manual setting Histogram setting menu Function menu Options Description Bin Set the number of bins 10 20 40 100 200 400 High Set the high limit of horizontal scale Low Set the low limit of horizontal scale Center Set the middle value of horizontal sc...

Page 43: ...surement when a serial of stable readout is measured beeper will beep once and record the measured value on the display 8 readings can be remained on the display Press to enter Hold measurement Probe Hold will be displayed above the display as Figure2 53 Figure 2 53 Hold measurement Menu of Hold measurement Function menu Options Description Probe Hold On Off Turn the probe hold function on or off ...

Page 44: ... all files to U disk Chapter 3 Practical Cases 3 1 Readings Statistics The value of readings statistics is refreshing when multi readings are continuously measuring as Figure 3 1 and 3 2 Steps 1 Press button to enable DC voltage measurement and select proper voltage range 2 Connect the ends of test leads with the multimeter Connect the red test lead to terminal Input HI and the black one to termin...

Page 45: ... Relatively to set the reference value by direction buttons 6 Users can also open the relative value in measurement to obtain the test lead impedance after relative operation Figure 3 3 Reading of short circuit test leads Figure 3 4 Reading after relative operation 3 3 DBm Measurement dBm measurement is commonly used in audio signal measurement Steps 1 Press to enable AC voltage measurement and se...

Page 46: ...ct to circuit 1 Measure dBm2 values as 3 3 dBm Measurement shown 2 Press dB to enable dB function and set dBm1 the current measured value will be set as the dB relative value By this time the reading is 0 3 Connect to circuit 2 and the power difference between 2 circuits will be displayed 3 5 Limit Test In the limit test indication will be enabled and beeper will beep for over range signal accordi...

Page 47: ...igure 3 11 Figure 3 10 DCV Hold measurement Figure 3 11 ACV Hold measurement 3 7 Thermocouple Setting and Measurement Thermocouple is common temperature sensor The type voltage and the cold junction temperature of thermocouple is required in thermocouple measurement With a built in temperature sensor UT8805E is able to measure the temperature cold junction temperature near the terminal HI and term...

Page 48: ...12 K type thermocouple temperature measurement 3 Return to the previous menu select Probe Unit to set the unit to be C then the measured value will be displayed 4 Press button and then select Ref Temp to display the temperatures of measurement and reference sensor simultaneously Figure 3 13 Dual display of temperature measurement ...

Page 49: ...se train which will be filtered out by AC coupling true RMS measurements AC coupling true RMS measurement is ideal for measuring small AC signals with DC offset such as the AC ripple in the DC power supply output However there are cases where AC DC RMS need to be measured By this time the DC and AC component of the signal can be measured by DC AC voltage functions separately and then the value of ...

Page 50: ... sum 0 05 of reading 0 03 of range 0 05 of range 0 8 of reading 0 85 of reading 0 08 of range 4 3 Load Error AC Voltage In AC voltage measurement the input impedance of UT8805E is 1MΩ and resistor is in parallel to 100PF capacitors The multimeter test lead also will introduce some capacitance and load Table 4 2 shows the approximate input resistance of the multimeter at various frequencies Table 4...

Page 51: ...nel is fused 3 Check whether the scale is correct DCI or ACI 4 Check whether the input is ACI and the scale is in DCI Abnormal reading with DC power signal connected 1 Check whether the test lead is inserted into the current terminal and terminal LO correctly 2 Check whether the current scale fuse on back panel is fused 3 Check whether the measurement scale has been correctly switched to DCI or DC...

Page 52: ...on or improper handling The dealer shall not be entitled to give any other warranty on behalf of Uni Trend If you need warranty service within the warranty period please contact your seller directly Uni Trend will not be responsible for any special indirect incidental or subsequent damage or loss caused by using this device Appendix C Maintenance and Cleaning General Maintenance do not expose the ...

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