Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 41

Using the Y Function (Model 289 Only) W Caution To avoid damaging the circuit under test, be aware the Meter sources current up to 10 mA at an open circuit voltage up to 20 volts. To measure low resistances with the Meter, position the rotary switch to Y. This function has a single range and R is therefore disabled when the Meter is in the Y function. Only the relative and relative percent functions work with the Y function. Press the softkey labeled Menu to access these two functions. Testing for Continuity W Caution To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before testing continuity. Continuity is the presence of a complete path for current flow. The continuity function detects intermittent opens and shorts lasting as short as 1 ms. The Meter uses three indicators for the absence and presence of continuity: a resistance reading, an open/short indicator, and a beeper. The resistance reading is simply an ohms function measurement. However, for continuity transitions that are very short, the slow True-rms Digital Multimeters Making Measurements measurement response of the Meter will not appear in the digital display. Therefore, the continuity function uses a graphical indicator for the presence or absence of continuity. Figure 16 shows the short and open continuity indication. Short Open Figure 16. Continuity Indicator est36.eps To perform a continuity test, position the rotary switch to S and set up the Meter as shown in Figure 17. Press the softkey labeled j. In continuity, a short means a measured value less than 8 % of full scale for the 500 Ω range and less that 4 % for other resistance ranges. Note The Meter operates in manual range only while the continuity function is selected. 31