User manual FLUKE 87 TRUE RMS MULTIMETER

[. . . ] ® True RMS Multimeter 87 Users Manual PN 834192 August 1988 Rev. 8, 4/97 © 1988, 1989, 1990, 1992, 1993, 1994, 1997 Fluke Corporation. All product names are trademarks of their respective companies. Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. Operation is subject to the following two conditions: · This device may not cause harmful interference. [. . . ] Capacitance -9 nF Nanofarads (1 x 10 Farads). Capacitance nS 32 -9 Hold The meter is operating in a Display Hold mode. See item 10 for Display Holds. 31 The following annunciators indicate the unit of the Duty Not Used Not Used Holster and Flex-Stand The meter comes with a snap-on holster that absorbs shocks and protects the meter from rough handling. The holster is equipped with a Flex-Stand. Some uses of the holster with Flex-Stand are shown in Figure 2. value displayed: AC DC V mV A mA uA Alternating current or voltage Direct current or voltage Volts -3 Millivolts (1 x 10 volts) Ampere (amps). Current -3 Milliampere (1 x 10 amps) -6 Microampere (1 x 10 amps) Applications This section discusses some common applications for your meter, and alerts you to some considerations to keep in mind when taking measurements. 17 87 Users Manual Holster With Flex-stand Bent Holster With Flex-stand Extended Holster With Probe In Clip POWER-UP OPTIONS PRESS 2 SEC. WHILE TURNING METER ON LOW, OHMS/HIGH RESOLUTION ZERO MIN MAX RANGE HOLD ALERT RPM DISABLE AUTOMATIC POWER-OFF HI ACCURACY, 1 SEC. RESPONSE AUTORANGE VDC, VAC HI IMPENDANCE mV DC INPUT TURN OFF BEEPER TEST ROTARY SWITCH WARNING TO AVOID ELECTRICAL SHOCK REMOVE TEST LEADS BEFORE OPENING CASE TO PREVENT DAMAGE OF INJURY INSTALL QUICK ACTING FUSES WITH AMP/VOLT RATINGS SHOWN. F 1A 600V MIN INTERRUPT RATING 10 000A F 15A 600V MIN INTERRUPT RATING 10 000A _ + 9V NEDA 1604 6F 22 006P JOHN FLUKE MFG. PATENTS PENDING FLUKE AND PHILLIPS THE T & M ALLIANCE Holster With Flex-stand Looped Over Car Door Meter In Holster Face Down For Protection (Store Quick Reference Card Under Meter) Holster With Flex-stand Looped Over Belt ep2f. eps Figure 2. Holster and Flex-Stand 18 Applications Measuring Voltage (AC/DC) To measure voltage, connect the meter in parallel with the load or circuit under test. Each of the five ac/dc voltage ranges presents an input impedance of approximately 10 M in parallel with less than 100 pF. Ac voltage is accoupled to the 10 M input. To improve the accuracy of dc voltage measurements made in the presence of ac voltages, measure the ac voltage first. Note the ac voltage range and manually select a dc voltage range that is the same or higher than the ac voltage range. This method improves the dc voltage accuracy by ensuring that the input protection circuits are not being activated. A typical application is measuring the dc offset voltage of an amplifier in the presence of an ac signal. Measurement errors due to circuit loading can result when making either ac or dc voltage measurements on circuits with high source impedance. In most cases, the error is negligible (0. 1% or less) if the measurement circuit source impedance is 10 kilohms or less. Measuring Current Warning Do not attempt an in-circuit current measurement where the potential to earth is greater than 1000V. You may damage the meter or be injured if the fuse blows while current is being measured in a circuit which exhibits an open circuit voltage greater than 1000V. To measure current, connect the meter in series with the load or circuit under test. Press the BLUE button to toggle between alternating and direct current. If you do not know approximately what the current is, connect the circuit to the A input terminal first to see if you have a safe level for the mA µA input terminal. [. . . ] AC crest factor can be up to 3 at full scale, 6 at half scale. For non-sinusoidal wave forms add -(2% Rdg +2% Fs) typical, for a crest factor up to 3. The Fluke 87 is a True-RMS responding meter. The meter will display a reading (typically <25 digits) when the input leads are shorted together in the AC functions which is caused by internal amplifier noise. [. . . ]