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Kusam-meco KM-CAL-907 User Manual

Digital high precision multifunction calibrator
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Summary of Contents for Kusam-meco KM-CAL-907

  • Page 2 Introduction The voltage/current/pressure calibrator (the calibrator in the following) is a handheld, battery-operated instrument that measures and sources electrical and physical parameters. Features: Measure: DC-voltage, DC-current, frequency and continuity Source: DC-voltage, DC-current, simulation transmitter, frequency and pulse Pressure: measuring pressure, Calibrating pressure-voltage transmitter, Calibrating 2wire pressure transmitter, Calibrating pressure switch;...

  • Page 3: Standard Accessories

    Standard Accessories Make sure that the package contains all the accessories listed below. And if you find they are damaged or any of them is missing, please contact the vendor from which you purchased the product as soon as possible. Refer to the replacing part list in 15.3 in the Manual if you want to order the replacing parts.

  • Page 4: Safety Information

    3 Safety Information For the correct and safe use of the instrument, be sure to follow the cautionary notes stated in this manual whenever handling the instrument. The Company shall not be held liable for any damage resulting from use of the instrument in a manner other than prescribed in the cautionary notes.
  • Page 5 Do not use the meter if it is damaged. Before using the meter, inspect the case. Look for cracks or missing plastic .Pay particular attention to the insulation surrounding the connectors; Select the proper function and range for the measurement; Make sure the battery door is closed and latched before operating the meter;...
  • Page 6 Use only type 4 AAA batteries, properly installed in the meter case, to power the meter; Do disconnect the testing lead before shifting to different source or measurement functions; When servicing the meter, use only specified replacement parts. To avoid false reading, which could lead to possible electric shock or personal injury, replace the batteries as soon as the low battery indicator ( ) appears.
  • Page 7 4 Familiar With the Calibrator Figure 1 Entire Graph Figure 2 Measurement/ Source Terminals...
  • Page 8 5.1 Measurement/ Source Terminals 5.2 Keys Figure 2 shows the measurement /source terminals Figure 3 shows keys of the calibrator. of the calibrator. Table 2 explains their use. Table 3 explains their use. Table 2 Measurement/ Source Terminals Terminal Function Measurement Signals (+) : DCmV, Measurement Signals (+) : DCV, FREQ Measurement Signals (+) : DCmA...
  • Page 9 Table 3 Functions of the keys Name Function Source value set key Increment of source set point 6~10 Source value set key Decrement of source set point Mode conversion key MODE key Turn on or off measurement/ source function ON key Power key Turn on or off the power Backlight...
  • Page 10 UNIT Key Select pressure unit Turn on or off the 24V Loop power LOOP key Set the source value to default value; ZERO Key Set the pressure value to zero-point; In pulse source function, set the pulse number. START Key Source auto-pulse number;...
  • Page 11 d : Calibration pressure-switch e : Battery level indicator f : Measurement/Source function on g : Source /Pressure function off h : Measurement/Source voltage i : Measurement/Source current j : Source pulse k : 24V Loop Power Supply on l : Measurement pressure m : Beeper of measurement continuity n : Pressure reading zero off o : Measured value holding...

  • Page 12: Before Starting Source/Measurement

    w : DCmA auto-stepping or sweeping source x : Present unit of assistance district date y : Assistance districts date and message 5 Before starting source/measurement Operating Precautions Precautions for Safe Use of the Instrument When using the instrument for the first time, be sure to read the instructions given in Section Four “Precautions for Safe Use of the Instrument.”...
  • Page 13 General Handling Precautions Before carrying around the instrument turn off power to the object under test, and then the POWER key of the instrument. If you are using an Charger, disconnect the power cord from the wall outlet. Finally, detach all lead cables from the instrument.
  • Page 14 Environmental Requirements Use the instrument in locations that meet the following environmental requirements: Ambient temperature and humidity Ambient temperature range: 0 to 50℃ Ambient humidity range: 20 to 80% RH. Use the instrument under non-condensing condition. Flat and level locations Do not use the instrument in locations that are Exposed to direct sunlight or close to any heat source.
  • Page 15 When using the instrument within a temperature range of 0 to 18°C or 28 to 50°C, add a value based on the temperature coefficient shown in Chapter 18“Specifications” to the given accuracy rating. When using the instrument at an ambient humidity of 30% or lower, prevent electrostatic charges from being produced, by using an antistatic mat or any other alternative means.
  • Page 16 Step 1: Remove the lead cables and charger and turn off the calibrator before you begin installing batteries. Step 2: Remove the battery holder cover by sliding it in one-quarter counterclockwise direction and turn off the calibrator. Step 3: Install four alkaline batteries of same type in the battery holder with their positive and negative electrodes positioned correctly as indicated on the holder.
  • Page 17 Note that the battery replacement indicator is driven by directly measuring the battery voltage when the calibrator is in actual operation. Consequently, the indicator may read differently depending on the battery load condition (e.g., the load condition of the source output is on/ off state) if the batteries are too low. Connecting the Charger Warning Make sure the voltage of the AC power source matches the rated supply voltage of the Charger, before...
  • Page 18 Automatic Power-off When the calibrator is running on batteries and no key is operated for approximately ten minutes, the calibrator turns off automatically. The automatic power-off time could be reset in the factory default parts, see Chapter 10 “Factory Default”. Turning On/Off the Backlight The LCD can be backlit.
  • Page 19 7 Source From the calibrator, you can source a DC voltage, DC current, frequency, pulse signal. Warning To avoid electrical shock, do not apply more than the rated voltage, as marked on the calibrator, between terminals or between any terminal and earth ground. Always use the calibrator in locations with a voltage to ground below 30 Vpk.
  • Page 20 For DC current (Figure 6) Step 1: Connect the black lead cable for source to the “mA-” output terminal and the red lead cable to the ‘’mA+/LOOP’’ output terminal. Step 2: Connect the other ends of the cables to the input of equipment under test while making sure the polarities are correct.
  • Page 21 key continuously changes the digit in question. And the value won’t change if it is increased or decreased to the Maxim or Minimum value. Pressing the〔ZERO〕key initializes the output set point to the default value (0). Step 3: Pressing the 〔ON〕 key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the present DC voltage between the output terminals.
  • Page 22 key continuously changes the digit in question. And the value won’t change if it is increased or decreased to the Maxim or Minimum value. Pressing the〔ZERO〕key initializes the output set point to the default value (0). Step 3: Pressing the 〔ON〕 key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the preset DC current between the output terminals.
  • Page 23 Step 3: Pressing the 〔ON〕 key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the preset 4–20 mA current signal between the output terminals. Step 4: To turn off the output, press the〔ON〕key once again. The’’ OFF ‘’appears on the LCD and no signals sourced between the terminals.
  • Page 24 Step 4: Pressing the〔START〕key once more stops the auto-stepping and auto-sweeping source. The “RUN “ mark disappears. The terminals source the value displayed on the screen. Step 5:Pressing the〔ON〕key stops sourcing and ‘’OFF’’ mark displayed on the screen. No signals sourced between the terminals.
  • Page 25 Tips: You can not undertake increment or decrement set for mA%, can set the mA value only. 7.3.4 4-20 mA simulating transmitter source Connect the calibrator and the loop power as listed in Figure 7, and operate in steps shown in sourcing DC current.

  • Page 26: Sourcing Frequency

    7.4 Sourcing Frequency The calibrator can source a constant pulse signal responding to the preset frequency and amplitude. Step 1: Using the〔FREQ〕key, select frequency source function. The LCD shows the default frequency value10 Hz. Step 2: Using the〔RANG〕key, select a desired frequency range from 100Hz, 1KHz, 10KHz. The selected function and the default range source value and unit shall be shown on the LCD.
  • Page 27 Step 5: Set the output value digit by digit using each pair of〔 〕/〔 〕output setting keys. Each pair of〔 〕/〔 〕keys corresponds to each digit of the LCD reading. Each press of the〔 〕/〔 〕 key increases or decreases the digit. Increasing the digit from 9 or decreasing it from 0 causes the digit to overflow or underflow, allowing you to set the output value without interruption.
  • Page 28 Tips: The frequency range could only be changed by pressing〔RANGE〕key in the frequency set mode. The frequency value and range could be changed when the frequency source function is both in ‘’ON ‘’ or ‘’OFF‘’ state. 7.5 Sourcing Number of Pulses The calibrator can source a preset number of pulse signal responding to the preset frequency and amplitude.
  • Page 29 Step 4: Pressing the 〔Vpeak〕 key once switches to amplitude setting mode. The LCD provides a reading of 1V. Step 5: Set the output value digit by digit using each pair of 〔 〕/〔 〕output setting keys. Each pair of〔 〕/〔 〕keys corresponds to each digit of the LCD reading. Each press of the〔 〕/〔 〕key increases or decreases the digit.
  • Page 30 Step 8: To re-enter into the frequency set mode, press the〔FREQ〕key to set the frequency. Step 9: Pressing the 〔ON〕 key causes the SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’, and the calibrator sources low level between the output terminals. Step 10: Pressing the〔START〕key the calibrator sources the set number of pulse responding to the preset frequency and amplitude, LCD shows the symbol “RUN”.
  • Page 31 7.6 Zero-off function In any range of DC voltage, DC current functions, pressing the〔ZERO〕key selects clearing off function, which initializes the preset source value for the convenience of user to reset source value. In frequency, pulse output functions, the〔ZERO〕key is unavailable. 8 Measurement From the calibrator, you can measure a DC voltage, DC current, frequency, continuity.

  • Page 32: Connecting Cables To Terminals

    8.1 Connecting Cables to Terminals For DC voltage(mV), continuity measurement (Figure 8) Step 1: Connect the black lead cable for measurement to the“COM” input terminal and the red lead cable to the ”mV” input terminal. Step 2: Connect the other end of the cable to the measuring terminals of equipment under test while making sure the polarities are correct.
  • Page 33 Step 2: Connect the other end of the cable to the measuring terminals of equipment under test while making sure the polarities are correct. Warning Before connecting the calibrator to the device under test, cut off the power to the device. Do not apply any voltage or current exceeding the allowable voltage (60 Vpk) or current (55 mA).

  • Page 34: Measuring Dc Voltage

    8.2 Measuring DC Voltage Step 1: Make sure the lead cables for measurement are not connected to the measuring instrument under test. Step 2: Using the〔V〕key, select DC Voltage measurement function. Step 3: Connect the lead cables for measurement to the measuring terminals of the measuring instrument under test.
  • Page 35 8.3.1 mA % Display In mA measurement function, the preset value displayed on main districts of the LCD. And mA% value displayed on assistance districts of the LCD. 100(current measured value mA-4mA) mA %= 16 mA 8.3.2 Using As 24-V Loop Power Supply This function helps to turn on a 24V loop power supply connected in line with the measured DC current circuit, in which you can use the calibrator as a loop power supply...
  • Page 36 8.4 Measuring Frequency Step 1: Make sure the lead cables for measurement are not connected to the measuring instrument under test. Step 2: Using the〔FREQ〕key, select frequency measurement function. Step 3: Connect the lead cables for measurement to the measuring terminals of the measuring instrument under test.
  • Page 37 8.6 Measurement-filtering function Selecting measurement-filtering function stabilizes the measured value displayed on LCD. In DCV, DCmA function, pressing the 〔AVG〕 key causes calculation of the average of the samples. LCD shows the “AVG” symbol. Repressing the〔AVG〕key cancels the calculation and the “AVG” symbol disappears. 8.7 Measured Value holding function Apart from the continuity measurement functions, the reading-hold function can be used to preserve the current measured value on the upper part of LCD, which consequently doesn’t refresh the measured value.
  • Page 38 9 Pressure Use calibrator calibrating pressure, calibrating pressure-transmitter, calibrating pressure switch. in an application where the calibrator is used together with the supplied lead cables for measurement, the allowable voltage to ground of the input terminals 60 peak maximum. To avoid electrical shock, do not use the calibrator at any voltage exceeding the maximum voltage to ground.

  • Page 39: Measuring Pressure

    9.1 Measuring Pressure Ranges and types of the pressure module have various options. See “Accessories” for more information. Due to the difference in medium and accuracy of different pressure modules, user needs to read the Manual before operating it. Real pressure module can work as a surface pressure module by opening the L input terminal exhausting the air.
  • Page 40 Step 1: Connect the pressure module and calibrator as shown in Figure 12. The screw of the pressure module pipe is compatible to the 1/4 inch NPT connector. If you have other requirement, contact the vendor. Step 2: Using the〔MODE〕key, select the pressure measurement function. The LCD shows “PRESSURE” at right upper part.
  • Page 41 Tips: For absolute pressure module, the calibrator saves the zero-off value and reuses the value automatically. Therefore, user does not need to zero off the calibration value for each use. Pressing the〔UNIT〕key convert pressure unit (kg/cm , cmH O, mmHg, PSI, bar, mbar, MPa, Kpa). 9.2 Calibrate Pressure-Voltage Transmitter Calibrator can measuring voltage signal from transmitter under pressure mode.
  • Page 42 Step 4: Zero off the reading following the pressure module manual. When the reading overtops the 5 percentage of maxim value of the range, the LCD shows “ERR” in the lower part. Pressing the〔ZERO〕key initializes the calibrator to 0,and “△”symbol shows on the left upper part of the LCD. Step 5: Apply pressure on the pipe with the pressure source until the desired pressure value displayed on the LCD.
  • Page 43 Step 2: Pressing the〔ON〕key, the calibrator connects and senses the type of the pressure module and sets the range automatically. If it fails to connect, the LCD shows “NO.OP” in the upper part. Step 3: Press the〔mA〕key to select measurement current function.
  • Page 44 9.4 Calibrate Pressure Switch Calibrator can measuring switch on and off. Step 1: Connect the pressure module and calibrator as shown in Figure 15. Step 2: Pressing the〔ON〕key, the calibrator connects and senses the type of the pressure module and sets the range automatically.

  • Page 45: Factory Default

    Step 5: Apply pressure on the pipe with the pressure source until the desired pressure value displayed on the LCD. The LCD shows switch state “CLOSE” or “ OPEN” in the assistance district part. Tips: The beeper sounds for one second if the state of the switch under measurement is changing. Pressing the〔HOLD〕key to unlock switch state and pressure measurement.
  • Page 46 Step 3: Pressing the〔ON〕key, LCD displays “SAVE” symbol on the assistance district part for 1s. Tips: Zero default value (0) represents no automatic power-off function. 10.2 Setting Backlight time Step 1: Pressing the〔MODE〕key, LCD displays “BL.OFF” symbol on the upper part, indicating backlight time setting mode.

  • Page 47: Setting Frequency

    Tips: When the default value is 0, the backlight won’t be off automatically if turned on, except that you turn it off manually. 10.3 Setting frequency Step 1: Pressing the〔MODE〕key ,LCD displays “FRSET” symbol on the upper part, indicating frequency setting mode.

  • Page 48: Adjusting Measurement Functions

    Tips: Any change of setting to the above-mentioned function, press the 〔ON〕 key to save the value. Any press of the〔ON〕key saves the nearest setting value. 11 Adjusting Measurement Functions Environmental Requirements Ambient temperature: 23 ±5℃ Relative humidity: 35% to 75% RH Warm-up: Before using, warm up the calibrator for the period of time specified.
  • Page 49 Measurement Adjustment Operation Please undertake the adjustment following the sequence and points listed in Table 4. Table 4 Adjustment Points of Measurement Functions Range Adjustment Point Remarks DCV_200mV 200mV Notice: replace input DCV_5V terminal DCV_50V DCmA_50mA 50mA FREQ_500Hz 500Hz Plus 3V square wave * Applying reference input signals from the calibration standard as listed in the above table.
  • Page 50 Tips: If the battery level is below 25% full, the adjustment operation can’t be operated. And the LCD shows “ERR” in the lower part. 11.1 Adjusting all ranges of the DC Voltage Step 1: Make sure the lead cables for measurement are not connected to the measuring instrument under test.

  • Page 51: Adjusting Frequency

    〕key saves the adjusted value and the LCD shows “SAVE” symbol in the upper Step 6: Pressing the〔 part for 2 seconds. Step 7: Pressing the〔ZERO〕key exits the CAL mode and back to step 4 for next range, until other range adjustment is finished.
  • Page 52 11.3 Adjusting 50mA DC Current Step 1: Make sure the lead cables are not connected to the standard source. Step 2: Using the〔mA〕key, select DC current function. Step 3: Connect the lead cables to the output terminals of the standard source as shown in Figure 17. Step 4: The measured value and unit shall be shown in the upper part of the LCD.

  • Page 53: Adjusting Source Functions

    12 Adjusting Source Functions Environmental Requirements Ambient temperature: 23±5℃ Relative humidity: 35% to 75% RH Warm-up: Before using, warm up the calibrator for the period of time specified. Set the meter into the standard environment for 24 hours, and then turn on the power. Change the set into non-automatic power-off state and warm it up for one hour.
  • Page 54 You must calibrate all the calibrating points of the selected range together. Turn on the meter, press the (MODE) key while simultaneously holding down the〔ON〕key into the source adjusting state. Tips: ( KEITHLEY 2000) If the battery level is below 25% full, the adjustment operation can't be operated.
  • Page 55 Step 4: Read the calibrator output on the calibration standard. Then, using the pair of 〔 〕/〔 〕keys, adjust the reading so that it matches the measured CAL adjustment setpoint. In the CAL mode, the right pair of 〔 〕 /〔...
  • Page 56 digital meter (KEITHLEY2000 ) 12.2 Adjusting Current Source Step 1: Using 〔mA〕key, select DC current function. Connect the lead cables for measurement to the standard digital meter as shown in Figure 19. Ω standard resistance Step 3: The LCD shows “CA-0” or “CA-F” symbol on the （...

  • Page 57: Replacing Batteries Or Fuse

    Step 5: Pressing the〔START〕key shifts to the next setpoint. Step 7: By repeating steps 2 to 5, you can adjust all the adjustment point assigned to that range. Note: Make sure the previous adjusting point has been saved before shifting to another one. 13 Replacing Batteries or fuse: Warning To avoid possible electric shock, remove the test leads from the calibrator before open the battery door.
  • Page 58 When replacing, use only four same specified ones. Take out the battery if you don’t operate the meter for a long time. Step 1: Remove the test leads and Charger before replacing batteries or fuse, and turn off the meter. Step 2: Remove the protector as shown in Figure 20.With a standard blade hand screwdriver, turn each battery door screw a...

  • Page 59: How To Use The Charger

    14 How to use the charger Warning The charger could be used only to specified product. Make sure the voltage of the AC power is same with the given voltage of the charger before connecting them. Do not shut circuit the output plug of the charger. Do not charge non-Ni-Cd, non-Ni-MH battery or wasted battery.

  • Page 60: Maintenance

    15 Maintenance 15.1 cleaning the calibrator Warning To avoid electrical shock or damaging the meter, serve the meter only by the replacement parts specified and never get water inside the case. Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers. Clean the Calibrator with a soft cloth dampened with water or water and mild soap.

  • Page 61: Replacement Of Parts

    15.3 Replacement of Parts All the types of parts are listed in Table 6, see Figure 21 as reference. Figure 21. Replacing part...
  • Page 62 Table 6. Replacing parts Item Instruction Quantity Item Instruction Quantity Top panel Bottom Panel plastic lens Spring A Rubber Key Spring B Terminal Wrapper Spring C Terminal Gasket AAA Alkaline battery LCD Frame Tilt-stand Screw M3*16 Backlight Panel Battery Door Conductive Rubber Plastic Screw wire...
  • Page 63 16 Options For more information about the options (see Figure 22) and its price, please contact the representative of the company. For information about relevant pressure module and its type (see Table 8 and Table 9). For information about the new pressure module, which isn’t listed in Table 8 and table 9,please contact the representative of the company.
  • Page 64 17 Specifications and Capacitance of External Pressure Module The pressure module output can possibly cause overflow the five digits of LCD. Or when choosing an unsuitable unit, the value cannot be read due to smallness. LCD displays OL (overload) if the reading exceeds those range listed in the following table.
  • Page 65 APM200KGSG 0to200kPa gauge 0.025％ 0. 05％ APM250KGSG 0to250kPa gauge 0.025％ 0. 05％ APM004BGSG 0to400kPa gauge 0.025％ 0. 05％ APM006BGSG 0to600kPa gauge 0.025％ 0. 05％ APM010BGSG 0to1MPa gauge 0.025％ 0. 05％ APM016BGSG 0to1.6MPa gauge 0.025％ 0. 05％ APM021BGSG 0to2.1MPa gauge 0.025％ 0.
  • Page 66 APM100BGSG 0to10MPa gauge 0.025％ 0. 05％ APM160BGSG 0to16MPa gauge 0.025％ 0. 05％ APM200BGSG 0to20MPa gauge 0.025％ 0. 05％ APM250BGSG 0to25MPa gauge 0.025％ 0. 05％ APM400BGSG 0to40MPa gauge 0.025％ 0. 05％ APM600BGSG 0to60MPa gauge 0.025％ 0. 05％ APM700BGSG 0to70MPa gauge 0.025％ 0.
  • Page 67 APM015PASG 0to103kPa(0to15psi) absolute 0.025％ 0.05％ APM030PASG 0to207kPa(0to 30psi) absolute 0.025％ 0.05％ APM007BASG 0to700kPa absolute 0.025％ 0.05％ APM200PCSG -103kPa to 1.379MPa (-15 to 200psi) combination 0.025％ 0.05％ APM001BCSG -100kPa to 100kPa / -1bar to 1bar combination 0.035％ 0.07％ APM001BVSG -100kPa to 0kPa Vacuum 0.035％...
  • Page 68 Table 9. APM-H Pressure Module Specification APM-H Pressure Module 1 Accuracy 0.010％F.S. APM005PGHG 103kPa(15psi) gauge APM020PGHG 345kPa(50psi) gauge APM100PGHG 689kPa(100psi) gauge APM500PGHG 3450kPa(500psi) gauge APM01KPGHG 6890kPa(1000psi) gauge APM015PAHG 103kPa(15psi) absolute APM050PAHG 345kPa(50psi) absolute APM100PAHG 689kPa(100psi) absolute APM500PAHG 3450kPa(500psi) absolute APM01KPAHG 6890kPa(1000psi) absolute APM03KPAHG...

  • Page 69: Specifications

    18 Specifications General Specifications for measure These specifications assume: A 1-year calibration cycle An operating temperature of 18 to 28 Relative humidity of 35% to 70% (non_condensing) Accuracy is expressed as ± (percentage of reading + percentage of range). F Function Reference Range Resolution...
  • Page 70 Other feature: Rate: 2 Readings per Second about Normal Mode Rejection Ratio (NMRR) ≥120dB (at 50Hz or 60Hz) Common Mode Rejection Ratio (CMRR) ≥60dB (at 50Hz or 60Hz) Temperature Coefficient: 0.1 times the applicable accuracy specification per degree ºC for 5 ºC to 18ºC and 28ºC to 50ºC.
  • Page 71 Accuracy is expressed as ± (percentage of set value + percentage of range) Function Reference Range Resolution Accuracy Remark 1000mV -100.000mV~ 10μV 0.02+0.01 Maximum output current: 2mA 1100.000mV -1.0000V~ 0.1mV 0.02+0.01 Maximum output current: 5mA 11.0000V 20mA 0.000mA~ 1μA 0.02+0.02 External supply for simulate 22.000mA mA: 5V–28V...
  • Page 72 10KHz Amplitude accuracy: ±(10% +0.5V); Maximum load: >100 KΩ; Duty Cycle: 50%. LOOP Maximum current: 25 mA ±10% Short circuit protected Other feature: Temperature Coefficient: 0.1 times the applicable accuracy specification per degree ℃for 5 to 18 and 28 to 50 . Maximum voltage between any output terminal and earth: 30Vpk Maximum output current: Approximately 25mA.
  • Page 73 General Specifications for Pressure Function Reference Range Resolution Accuracy Remark Determined _____ Determined Determined For more detail, refer the PRESSURE by pressure by pressure by pressure pressure module about APM. module module module Other feature: Temperature Coefficient: 0.1 times the applicable accuracy specification per degree ℃ for 5ºC to 18ºC and 28ºC to 50ºC.
  • Page 74 19 Points for Attention to Use of Operation Instruction The present operation instruction is subject to change without notice. The content of the operation instruction is regarded as correct. Whenever any user finds its mistakes, omission, etc, he or she is requested to contact the manufacturer. The present manufacturer is not liable for any accident and hazard arising from the customer misuse or inadvertent operation.

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