Fluke 8808A User Manual page 93

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 AC
Volts DC Current DC
Volts DC Current AC
Volts AC Current DC
Volts AC Current AC
Volts AC Frequency
Current DC Current AC
MN MX Actual Value
REL Actual Value
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Table A-2. Sample Dual Display Applications
Secondary
Display
• 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.
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Appendices A
Applications
A-3