Document
Mastech MS8264
User's Manual
GENERAL INSTRUCTIONS This instrument complies with IEC 1010-1 (61010-1@IEC: 2001), CAT. II 1000V and CAT. III 600V overvoltage standards. See Specifications. To get the best service from this instrument, read carefully this user's manual and respect the detailed safety precautions. International symbols used on the Meter and in this manual are explained in chapter 1.1.3
Precautions safety measures
1.1.1 Preliminary * Measurement category III is for measurements performed in the building installation.
NOTE: Examples are measurements on distribution boards, circuit-breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial use and some other equipment, for example, stationary motors with permanent connection to the fixed installation. * Measurement category II is for measurements performed on circuits directly connected to the low voltage installation.
NOTE: Examples are measurements on household appliances, portable tools and similar equipment. * Measurement category I is for measurements performed on circuits not directly connected to MAINS.
NOTE: Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits. In the latter case, transient stresses are variable; for that reason, requires that the transient withstand capability of the equipment is made known to the user. * When using this Multimeter, the user must observe all normal safety rules concerning: ― protection against the dangers of electric current. ― protection of the Multimeter against misuse. * For your own safety, only use the test probes supplied with the instrument. Before use, check that they are in good condition.
1.1.2 During use * If the meter is used near noise generating equipment, be aware that display may become unstable or indicate large errors. * Do not use the meter or test leads if they look damaged. * Use the meter only as specified in this manual; otherwise, the protection provided by the meter may be impaired.
* Use extreme caution when working around bare conductors or bus bars.
* Do not operate the meter around explosive gas, vapor, or dust.
* Verify a Meter's operation by measuring a known voltage. Do not use the Meter if it operates abnormally.
Protection may be impaired. When in doubt, have the Meter serviced.
* Uses the proper terminals, function, and range for your measurements.
* When the range of the value to be measured is unknown, check that the range initially set on the
multimeter is the highest possible or, wherever possible, choose the autoranging mode.
* To avoid damages to the instrument, do not exceed the maximum limits of the input values shown in the
technical specification tables.
* When the multimeter is linked to measurement circuits, do not touch unused terminals.
* Caution when working with voltages above 60Vdc or 30Vac rms. Such voltages pose a shock hazard.
* W.