The common problems in digital multimeter

Q: why didn't my multimeter in ac voltage mode to zero?

A: if it is a true RMS ac multimeter, 17 x or x 8, for example, it is not zero, and should not return to zero.For ac voltage and ac current, true RMS multimeter most has the lowest ac voltage and current index, usually for the range of 3% to 5%.When the signal is above the minimum levels, instrument will meet its accuracy index.Can be found in the user manual part at the back of the technical indicators the index.

Q: the CAT III shows security levels mean?

Answer: the answer is located in the application of the article "digital multimeter." ""With the features and functions of ABC - a multi-meter.".

Q: in accuracy index (3 word reading + 1%), the word is what mean?

A: it refers to the range, the least significant bit of instrument.For example, we use 6000 words A multimeter measuring 120 V ac voltage (A/D converter) from 0 to 5999 words.In order to measure 120 V ac voltage, the instrument must be in 600.0 ac voltage range.The resolution (least significant bit) 0.1 V.(120 V X 1% = 1.2 V + 3 words) = (1.2 V to + 0.3 V) = 1.5 V

Q: multimeter model of minimum/maximum value and the peak of what's the difference?

A: as the name implies, "Min/Max" (Min/Max) model is a multimeter from the "Min/Max" (Min/Max) record mode began to measure the maximum and minimum of readings.Under normal circumstances, in order to obtain accurate readings, need from 200 to 350 milliseconds or longer period of time the maximum or minimum value measurement signal.They apply to any schema, such as dc voltage, true RMS ac voltage, resistance and current function."Peak" (Peak) model of positive and negative Peak voltage measurement signal.For 120 V ac circuit, peak readings will reach + 169 V and 169 V (for pure sine wave, x 1.414 = 169 V, 120 V).Normally, they can be well used in the peak of 250 microseconds, or for a longer time.

Q: when resistance short-circuit test line mode, the meter reading is not zero.Why is that?

Answer: the instrument measurement is test line resistance, a new set of test line usually 0.1 to 0.3 ohm resistance range.The error of the test line need to subtract from resistance.Some of the more feature-rich instrument will provide the "Relative delta" (Relative difference) (in the final result using actual Δ symbol) mode button, it will be minus the test line error.

Q: fo雷竞技appr Fluke 289, save the readings can be stored in the instrument?

A: you can "Save the Memory" (Save the Memory) Save a total of 400 Save most readings.

Q: fo雷竞技appr Fluke 289, can keep records of how many times before need to download?

A: you can up to save a total of 400 records in the memory.By putting a time interval is set to 15 minutes, even if you use all 400 save reading storage location, before need to upload the result to the computer, also can get more weeks.

Q: fo雷竞技appr Fluke 289, how much can be saved in the instrument memory "Min/Max" (Min/Max) and "Peak" (Peak) readings?

A: repeat again, "Min/Max" (Min/Max and "Peak" (Peak), respectively, a total of 400, a total of 800 readings.

Q: fo雷竞技appr Fluke 289, "+ Name" (+ Name) menu folder and how much can be saved.These can also be stored 400 readings?

A: can't.When you select the name, such as "Motor" (Motor), "the Panel (Panel)," Circuit (Circuit) ", "Control" (Control) or "'" (Battery), you need to do is to "Save" (Save), "Record" (Record), "Min Max" (Min/Max) or the "Peak" (Peak) reading placed in the files of the selected folder.A total of 400 still each measurement type.