Fluke 8808A User Manual - Page 93
Updating Primary and Secondary Displays with Separate Measurements
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A Appendices Applications If the relative readings value of a dc voltage measurement is shown in the primary display and the dc voltage itself is shown in the secondary display, the Meter takes a single measurement and updates both displays with it. Updating Primary and Secondary Displays with Separate Measurements If the measurement function in the primary display is different from that in the secondary display, the Meter updates each display using a separate measurement. Taking Voltage and Current Measurements Using the Dual Display Most applications of the dual display listed in Table A-2 can be performed using a single set of test leads connected to the INPUT VZYR HI and LO terminals. However, to measure the voltage and current of an input signal requires three leads. Be sure that the voltage and current measurements share the same common as shown in Figure A-2. Then simply follow the precautions you would follow if you were making normal current measurements without a current clamp. Primary Display Volts DC Volts DC Volts DC Volts AC Volts AC Volts AC Current DC MN MX REL Table A-2. Sample Dual Display Applications Secondary Display Volts AC Current DC Current AC Current DC Current AC Frequency Current AC Actual Value Actual Value Applications • Monitor dc level and ac ripple of power supply Troubleshoot amplifier circuits • Check power supply load regulation • Monitor UUT current draw and circuit voltages • Monitor loop current and voltage drop across transmitter • Line and load regulation tests • dc/ac or ac/dc converters • Line and load regulation tests • dc/ac or ac/dc converters • Line and load regulation tests • Transformer (magnetic circuit) saturation • Measure ac amplitude and frequency for line voltage and ac signal analysis • Measure frequency response of an amplifier • Adjust ac motor control • Read noise in telecommunication applications • Adjust portable power generator to optimize power output • Set frequency compensation for a network • Measure ripple and dc current draw of switching power supply • Measure current dissipation in protective fuse resistors used in power supplies • Measure ripple and noise on a line • Show the minimum or maximum value recorded and the present measurement • Show actual measurement and the difference between this value and the relative base. A-3