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What is a Digital
Multimeter (DMM)? What is a Digital Multimeter (DMM)? A Digital Multimeter (DMM) is a convenient measuring instrument that allows by itself the measurement of DC voltage, AC voltage, DC current, AC current and resistance (Pocket type DMM normally cannot be used for the measurement of current for safety reasons). In addition to these basic measuring functions, most of our models are provided with features such as a diote test function and continuity buzzer. Some of the recent products feature the measurement of frequency of maximum and minimum value hold and relative value measurement as well as data hold and range hold functions. The advent of DMMs connectable to a PC (PC series) makes it possible to let a PC assume the function of expensive recording meters and recorders. What are the advantages of Digital Multimeters (DMMs)? 1. Highly accurate measurement. Higher accuracy (1% or less) compared with an analog multimeter (approx 3%) 2. Reduced measuring loss due to high internal impedance (low voltage drop between terminals) 3. No reading error. No parallax error and reading error by a user as occurs with an analog multimeter. What are the key points to be considered while choosing a suitable model? 1. What are the necessary measuring functions? Choose the necessary functions, except voltage and resistance measurements. (including need for the measurement of current - 400mA, 10A, 12A, 20A, capacitor, frequency, temperature and measurement of 4-20mA, etc.) 2. Other necessary functions: Functions required differ depending on where the measurement is taken A) To record measured
valued concurrently with the process of measurement 3. For
measurements of waveforms of non-sine waves, choose a model
supporting measurements by RMS values: In measuring distorted
sine and non-sine waves (square waves, triangular waves, pulse),
significant errors occur in measurements by mean values. 4. Other functions: There are other types including a function to transfer data during measurement to a PC in real time and a function to record measured data in a build-in memory. To transfer data to a PC, optional connecting cables and data retrieval software (PC Link or PC Link Plus) are required in addition to a DMM of PC series. Please refer to Digital Multimeter comparative chart available for download by clicking here (in PDF). It is also available on Pages 42-44 of our catalog. Our general catalog can be downloaded by clicking here (in PDF) - 3.2 MB or contact us to request a copy. SANWA is a leading handheld manufacturer since 1941 supporting a wide range of products with a world-renowned Japanese quality. Our products have not only the basic functions required for multimeters, but also sophisticated and versatile features realized by our expertise in the software development and ergonomic design. The products we provide range from multimeters to advanced ones which can satisfy specific needs in measurements and recording, even in the field of opto-electronics. With our compact, yet high-performance and beautifully designed products, we hope to satisfy customers in the world. ISO 9001 Quality Assurance: In November 2002, SANWA ELECTRIC INSTRUMENT CO., LTD. obtained ISO 9001 certification. (No. JQA-1453). The certification is given by Japan Quality Assurance Organization (JQA), which is an authorized member of IQNET, one of the globally recognized quality assurance organizations. The certification testifies to our compliance with the International Quality Assurance Standard. Traceability: Traceability to prove the compliance with national and international standards is an essential factor for measuring instruments used as test instruments associated with quality assurance. Products of Sanwa are calibrated by reference samples which is periodically checked for its compliance with national standards.
Warranty: All our products come with 12 month manufacturers warranty, so buy with confidence. What are the potential risks and how to measure safely using a Multimeter? Voltage Measurement: Never use a measuring instrument for a measurement category higher than specified. A tester not conforming to the international safety standard is for use with weak current. Never use these testers on a high power circuit of 250V or more. Referring to measurement categories defined in the IEC standard, use a measuring instrument of equivalent or higher category. For instance, when a measuring instrument is used on a motor of facility of 400V main power supply, which corresponds to category III, use a measuring instrument of CAT. III or higher. Current Measurement: Use special caution not to input voltage to the current measuring terminal in measurement. In current measurement, a meter is connected in series with the measuring circuit. For this reason, impedance inside the meter is low, thereby possibly causing a short-circuit fault. To prevent such a short-circuit fault and assure safe operation, fuses are installed for protection. Check the protection capability of the fuses. RD700 uses a quick-breaking ceramic fuse of rated voltage 250V and breaking current 1.5kA for the milliamp measuring circuit, which causes the fuse to blow out to prevent short-circuit when the main power supply is 250V or less and short circuit current is 1.5KA or less. To request a quote, please contact us at info@bhumika.ca or at +1 (613) 619 0894 If you wish to discuss your application in detail, please contact us to help us understand your requirements and suggest the most appropriate model. All orders are to be
placed to:
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CE
Marking: CE marking is a safety mark which can be attached only
on a product meeting the safety requirements of the Directive of
Council of European Union (EC Directive). A product attached with
the CE mark is designed so as to meet the requirements of the "Low
Voltage Directive" and the "EMC Directive" of the EC Directive.