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ST VA38 Manual

ST VA38 Manual

True rms multimeter
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VA38 True RMS Multimeter
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  • Page 1 VA38 True RMS Multimeter Contents...

  • Page 2: Table Of Contents

    VA38 True RMS Multimeter Contents Contents Chapter 1 Safety Information ◎ Meter Safety Standards…………………………………………………………………………………………………. ◎ Warning…………………………………………………………………………………………………………………. ◎ Limited Guarantee and the Liability Range…………………………………………………………………………….. Chapter 2 Introduction to the Meter ◎ Characteristics………………………………………………………………………………………….……………..… ◎ Explanation on Front Panel……………………………………………………………………………………………... ◎ Understanding Display Screen…………………………………………………………………………………………..
  • Page 3 VA38 True RMS Multimeter Contents ◎ DC mA/AC mA/DC mA +AC mA Measurement……………………………………….……………………………… ◎ DC Ampere/AC Ampere/DC Ampere+AC Ampere Measurement……………………….……………………………. ◎ Linear Frequency Measurement……………………………………….…………….……………….………..………… ◎ Relative Value Measurement………………………………………………………….………………………………… ◎ Maximum Value/Minimum Value/Maximum Value-Minimum Value Measurement………………………….……… ◎ Backlight Control……………………………………………………………………………………………….………. ◎ Data Hold………………………………………………………………………………………………………………..

  • Page 4: Chapter 1 Safety Information

    VA38 True RMS Multimeter Safety Information Chapter 1 Meter Safety Standards This style of digital multimeter is designed and manufactured according to the safety requirements set out by the IEC61010-1 standards for electronic test instruments and the hand-hold digital multimeters. Its design and manufacture is strictly based on the provisions in the 1000V CATⅢ...

  • Page 5: Limited Guarantee And The Liability Range

    VA38 True RMS Multimeter Safety Information potential during measuring. The body should be kept insulated from ground with dry insulating shoes, insulating pads or insulating clothes. When performing measurement with a test probe your fingers should be put behind a finger-protector.

  • Page 6: Characteristics

    VA38 True RMS Multimeter Safety Information Repair and calibration of the meter must be carried out by experienced professionals, unprofessionals should not repair and  calibrate the meter by themselves. Limited Guarantee and the Liability Scope This company will undertake repairs freely for any quality problem of the meter which if should be found within 18 months from the date at which it was bought, but which not including replacement of fuse and batteries as well as any damage caused by negligence, wrong use, pollution, change of circuit and non-normal use.

  • Page 7: Explanation On Front Panel

    VA38 True RMS Multimeter Introduction to the Meter DBm measurement  Maximum value/minimum value measurement, Relative measurement.  50-segment analog bar display.  Automatic shutdown/continuous working mode selection.  Back light control.  PC-LINK: RS-232C infrared interface.  Display, record and graphics software of computer.
  • Page 8 VA38 True RMS Multimeter Introduction to the Meter (1) VΩHz end It is the input end for all measurement functions except for current measurement, connected with a red meter probe. (2) COM end It is the negative input end for all measurements, connected with a black meter probe.
  • Page 9 VA38 True RMS Multimeter Introduction to the Meter (6)POWER switch Used for putting on or off the operating power for the meter. (7)RANGE key For various kinds of measurements it is used manually to select range. Under the automatic range state (AUTO displaying), it will enter manual range state(MANUAL displaying) with a press on RANGE, after that the range will be changed with a press on RANGE while the small digits on the left lower corner indicating the actual range.
  • Page 10 VA38 True RMS Multimeter Introduction to the Meter value. By pressing this key again it will be possible to display the minimum value and the maximum value-minimum value. When releasing the key after pressing it for two seconds, the maximum and minimum record state will be exited. Pressing this key will be void during frequency、diode measurement.

  • Page 11: Understanding Display Screen

    VA38 True RMS Multimeter Introduction to the Meter (14) ～Hz key During the voltage or current measurements, by pressing ～ Hz key the meter will enter the linear frequency measurement state. At this time what being measured is the frequency of voltage or current. By pressing this key again it will exit the linear frequency measurement state.
  • Page 12 VA38 True RMS Multimeter Introduction to the Meter Figure 2—2 LCD screen is shown as in Figure 2-2, with its every symbol’s meaning shown as in the Table 1: Number of Order Symbol Functions Indicating the measurement unit being ℃ or ℉ of temperature ℃...
  • Page 13 VA38 True RMS Multimeter Introduction to the Meter Indicating the measurement being automatic range AUTO MANUAL Indicating the measurement being manual range Indicator of range, indicating the full range value of this range in manual 51000 range such as 5, 50, 500 and 1000,5000, etc.

  • Page 14: Function Descriptions

    VA38 True RMS Multimeter Introduction to the Meter operator to wait Indication to low voltage of the batteries, showing the energy of batteries will be exhausted soon Analog bar, indicating the measurement value with a graphic mode Indicating the meter being in the state for sending data to the RS-232C interface of computer The display zone for the meter’s measurement value, showing all the...
  • Page 15 VA38 True RMS Multimeter Introduction to the Meter It is the AC power expressed in the logarithmic form. ● DC+AC measurement: when measuring voltage or current having both the AC and the DC components, in case of selecting the DC+AC measurement mode, this meter will perform measurements on both DC and AC components respectively and then calculate and display the results according to the following formula: DC+AC measurements reflect the general effective values generated jointly by both the DC and AC components.
  • Page 16 VA38 True RMS Multimeter Introduction to the Meter value(called initial value)when pressing the REL Δ key, and the later displaying value being: present value – initial value The relative measurement value reflects the changes of the measured value. It also can be used to take off the errors brought about by lead resistance or distributed capacitance during measuring low resistance and low capacitance.

  • Page 17: Chapter 3 Operation Methods

    VA38 True RMS Multimeter Introduction to the Meter ● PC-LINK (RS-232C interface): press the HOLD key for two seconds and then release it, the meter will open the infrared interface for sending the measured data and status to the RS-232C interface of computer. Equipped with record and graphic software (options)the meter can display, record and describe the measured electric quantity on computer.
  • Page 18 VA38 True RMS Multimeter Operation Methods immediately. 6. By pressing the RANGE key it is possible to select range manually. Indicator of range displays range. While displaying OL during manual range measurement, it is necessary to select a larger range. When OL displaying under the maximum range, it indicates the voltage exceeding 1000V, so it is necessary to remove both the red and black probes from the measured circuit immediately.

  • Page 19: Dcv/Dcv+Acv Measurement

    VA38 True RMS Multimeter Operation Methods The measurement is shown in Figure 3-2,the range of voltage is of AC or DC 0.5V～1000V and the methods are as follows: Turn on the power switch and set the rotary-table switch to the position Insert the red testing line into the VΩHz end and the black testing line into the COM end.
  • Page 20 VA38 True RMS Multimeter Operation Methods DCV + ACV Measurement Warning Not try to measure a voltage higher then 1000 vol dBm- True RMS AC+DC VA38 DMM uA mA V mV 10A MAX 500mA MAX 10SEC. MAX DC mV/AC mV/DC mV+AC mV Measurement...
  • Page 21 VA38 True RMS Multimeter Operation Methods The testing chart is shown in the Figure 3-3. The voltage measurement range is of 1μ V～500mV and the measurement methods are as follows: Turn on the power switch and set the rotary switch to the position Insert the red testing line into the VΩHz end and the black testing line into the COM end.

  • Page 22: Dc Mv/Ac Mv Dc Mv+Ac Mv Measurement

    VA38 True RMS Multimeter Operation Methods DC mV/AC mV DC mV+Ac mV Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV 10A MAX 500mA MAX 10SEC. MAX Figure 3-3 Logic Frequency/Duty Ratio Measurement...

  • Page 23: Logic Frequency/Duty Ratio Measurement

    VA38 True RMS Multimeter Operation Methods The testing chart is shown in the Figure 3-4.The frequency range is of 5Hz～2MHz（Vp 2.5～5V）,while the duty ratio measurement range being of 5%～95%.And the measurement methods are as follows: 1. Turn on the power switch and set the rotary switch to the position 2.
  • Page 24 VA38 True RMS Multimeter Operation Methods Logic Frequency Duty Ratio Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV Figure 3-4 10A MAX 500mA MAX 10SEC. MAX Diode Measurement...
  • Page 25 VA38 True RMS Multimeter Operation Methods The measurement chart is shown in figure 3-5. The measurement range of diode is of 0～2.5V. The measurement methods are as follows: Turn on the power switch and set the rotary switch to the position Insert the red testing line into the VΩHz end and the black testing line into the COM end.

  • Page 26: Diode Measurement

    VA38 True RMS Multimeter Operation Methods Diode Measurement dBm- True RMS AC+DC VA38 DMM Figure 3-5 uA mA V mV 10A MAX 500mA MAX 10SEC. MAX Resistance/continuity Test...

  • Page 27: Resistance/Continuity Measurement

    VA38 True RMS Multimeter Operation Methods The test chart is seen in Figure 3-6. the measurement range of resistance is of 0.01 Ω ～ 50M Ω and the measurement methods are as follows: 1. Turn on the power switch and set the rotary switch to the position 2.
  • Page 28 VA38 True RMS Multimeter Operation Methods Resistance Continuity Measurement dBm- True RMS AC+DC Figure 3-6 VA38 DMM uA mA V mV 10A MAX 500mA MAX 10SEC. MAX Capacitance Measurement Figure 3-6...
  • Page 29 VA38 True RMS Multimeter Operation Methods The measurement chart is seen in figure 3-7. the measurement range of capacitance is of 10PF～5000μF and the measurement methods are as follows: 1. Turn on the power switch and set the rotary switch to the position 2.

  • Page 30: Capacitance Measurement

    VA38 True RMS Multimeter Operation Methods Capacitance Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV 10A MAX 500mA MAX 10SEC. MAX Figure 3-7...
  • Page 31 VA38 True RMS Multimeter Operation Methods DC μA/AC μA /DC μA+ AC μA Measurement The measurement is seen in Figure 3-8, the measurement range of current is of AC or DC 0.01μA～5000μA , and the measurement methods are as follows: Turn on the power switch and set the rotary switch to the position Insert the red testing line into the mA/μA input end and the black testing line into the COM input end.

  • Page 32: Dc Μa Ac Μa Dc Μa+Ac Μa Measurement

    VA38 True RMS Multimeter Operation Methods DC μA AC μA DC μA+AC μA Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV 10A MAX 10SEC. MAX Figure 3-8...

  • Page 33: Dc Ma/Ac Ma/Dc Ma +Ac Ma Measurement

    VA38 True RMS Multimeter Operation Methods DC mA/AC mA /DC mA + AC mA Measurements The measurement is seen in the Figure 3-9. The measurement range of current is of AC or DC 1 μA～500mA and the measurement methods are as follows: 1.
  • Page 34 VA38 True RMS Multimeter Operation Methods DC mA AC mA DC mA+AC mA Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV 10A MAX 10SEC. MAX Figure 3-9...

  • Page 35: Dc Ampere/Ac Ampere/Dc Ampere+Ac Ampere Measurement

    VA38 True RMS Multimeter Operation Methods DC Ampere/AC Ampere/DC Ampere + AC Ampere Measurement The measurement is seen in Figure 3-10, the measurement range of current is of AC or DC 0.1mA ～ 10A and the measurement methods are as follows: Turn on the power switch and set the rotary switch to the position Insert the red testing line into the A input end and the black testing line into the COM input end.
  • Page 36 VA38 True RMS Multimeter Operation Methods Ampere Ampere Ampere Ampere Measurement dBm- True RMS AC+DC VA38 DMM uA mA V mV 500mA MAX 10SE Figure 3-10...

  • Page 37: Linear Frequency Measurement

    VA38 True RMS Multimeter Operation Methods Linear Frequency Measurement The measurement is seen in the Figures 3-1, 3-2, 3-3,3-8 and 3-9. The measurement range is of 5Hz ～ 200KHz and the measurement methods are as follows: When performing voltage or current measurement, in case of measured value being AC or including AC elements, it is possible to measure and display the alternating frequency by pressing the ～...

  • Page 38: Relative Value Measurement

    VA38 True RMS Multimeter Operation Methods Relative Value Measurement Except for frequency 、 duty ratio and diode measurements, all other measurements can employ relative measurement. Press REL Δ key to enter relative measurement and the meter will record the initial value when pressing the key. And the later displayed value is: Displayed value = present measurement value —...

  • Page 39: Backlight Control

    VA38 True RMS Multimeter Operation Methods the minimum value, the maximum value — minimum value or the maximum value. When the meter being in the maximum and the minimum value record state, the analog bar is always indicating the present measurement value but not the MAX/MIN value.

  • Page 40: Connected To Rs-232C Interface Of Computer

    VA38 True RMS Multimeter Operation Methods Notes: After auto-shutdown there will still be a little electricity consumption in the meter, so it is recommended to turn off the power when the meter is to remain un-working for a long time.

  • Page 41: Chapter 4 Technological Specifications

    VA38 True RMS Multimeter Technological Specifications Chapter 4 Technological Specifications General Features ● Voltage between the measurement end and ground is of 1000V AC/DC. 1000V CAT Ⅲ, 2th pollution grade. ● 50000 counts, automatic/manual range, basic sampling rate 2.5 t/s and 51 segment analog bar.

  • Page 42: Range And Accuracy

    VA38 True RMS Multimeter Technological Specifications Range and Accuracy The below-listed accuracies under different ranges refer to those which are guaranteed by the meter within one-year calibration, ° ° with normal use under the operating temperature of 18 ℃ -28 ℃ (64.4 F-82.4...
  • Page 43 VA38 True RMS Multimeter Technological Specifications ● AC Current/DC Current + AC Current Accuracy Voltage Drop Range Resolution 40Hz∽1KHz 1KHz∽10KHz 10KHz∽20KHz 102µV/µA 500μA 0.01μA ±(0.75%+20) ±(1%+20) ±(2%+20) 5000μA 0.1μA ±(0.75%+10) ±(1%+10) ±(2%+10) 50mA 1.5mV/mA 1μA ±(0.75%+20) ±(1%+20) ±(2%+20) 500mA 10μA ±(0.75%+10)
  • Page 44 VA38 True RMS Multimeter Technological Specifications ● Resistance Range Resolution Accuracy 500Ω 0.01Ω ±(0.1%+10) 5KΩ 0.1Ω ±(0.1%+5) 50KΩ 1Ω ±(0.1%+5) 500KΩ 10Ω ±(0.1%+5) 5MΩ 100Ω ±(0.1%+10) 50MΩ 1KΩ ±(0.5%+10) Notes: above accuracies can be guaranteed within the full range ● Capacitance...
  • Page 45 VA38 True RMS Multimeter Technological Specifications ● Logic Frequency Frequency Range Sensitivity Accuracy 5Hz∽2MHz Vp 2∽5V square wave ±(0.006%+4) ● Linear Frequency Frequency Range Voltage/Current Range Sensitivity Accuracy 500mV 100mV 0.5V 5Hz∽200KHz 500V ±(0.006%+4) (sine wave) 1000V 400V 5000μA 500mA 100mA Notes: Low voltage or low frequency would lower the accuracy.

  • Page 46: Chapter 5 Maintenance

    VA38 True RMS Multimeter Maintenance Chapter 5 Maintenance Replacement of Batteries If symbol appears on the LCD screen during measurement, it indicates the total voltage of batteries being lower than 6.8V. For ensuring measurement accuracy, it is necessary to replace the batteries. Before the replacement, must take off the red and black testing lines from the measured circuit and turn off the power of the meter.

  • Page 47: Meter Calibration

    VA38 True RMS Multimeter Maintenance Meter Calibration There is no any component which can be used for calibration in the meter, calibration of the meter is implemented depending on the built-in software in the meter. Professionals and accuracy-even-higher standard signal sources are required for calibration of the meter.

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