Operating Instructions
Operation
2
2-25
2-22. Relative (REL)
The relative function allows you to store any reading as an offset or relative
reference value. When you press the REL button, the REL indicator appears
in the upper right corner of the display, and the 8060A stores the next
measurement in a register along with the function and range. Subsequent
measurements are displayed as the difference between the measured value
and the stored relative reference (refer to Figure 2-17).
For example, if a reading of 1.0000V dc is displayed when the REL button is
pressed (the display will read 0.0000 after REL is pressed), subsequent
readings will have 1.0000 subtracted from them. If the next measurement is
1.2700V dc, the reading displayed will be .2700. If the next measurement is
0.8500V dc, the reading displayed will be -.1500. You may cancel the
relative reference by pressing the REL button (the REL indicator disappears
from the display), by turning the instrument off, or by storing a relative
reference with another function.
If you change ranges, the relative reference is automatically multiplied or
divided by the appropriate power of ten before being subtracted from the
measurement. If you change functions, the REL indicator disappears and the
relative reference is stored with the original function. When you reselect the
function, the relative reference is restored (the REL indicator reappears)
unless a new relative reference was established in another function.
The relative function may be used with all the measurement functions: ac or
dc voltage, ac or dc dB, ac or dc current, resistance, conductance, diode test,
and frequency. When used with continuity, the relative function stores the
accompanying resistance readings. Note that the input overload limits are not
changed by the use of the relative function.
Another thing to be aware of when using relative reference is that the range
of possible readings is still subject to the limits of the display and the 19999
counts of the analog-to-digital (a/d) converter, regardless of the relative
reference. For example, suppose the instrument is in the dc voltage function
with the 20V range selected, and you store a relative reference of 15V. The
maximum positive relative voltage reading that can be displayed without
overranging is 4.999V, which is actually a 19.999V input signal. Any input
signal greater than 19.999V exceeds the 19999 counts of the a/d converter.
The minimum (negative) voltage reading that may be displayed without
overranging is -19.999V, which is a -4.999V input signal. You can avoid this
situation by selecting a higher range.
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