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9640A
Instruction Manual
3-18
Toggle Offset Soft Key
Note that while the
Offset
field is present, a
Toggle Offset
soft key is also present. In the
following
Leveled-Sine
– Toggle Offset screen, the
Toggle Offset
soft key may be
pressed at any time to remove the offset from the output. The initial (
Offset
= 0) value is
restored and the
Offset
indicator on the Status Bar turns off.
ead04f.bmp
Leveled Sine - Toggle Offset
An additional press of the
Toggle Offset
soft key reapplies the offset, allowing
convenient toggling of the output between its initial and its offset values.
Offset (As Error) Soft Key
In a typical calibration application in which the Instrument has been set to a target
Level
(or
Frequency
), an offset may be applied until the UUT reads exactly the target value.
The offset setting is now related to the UUT error.
When the
Offset
field is the
focus
field, both its display and edit format may be switched
from an expression of offset of Instrument output to an expression of Error in the UUT.
This results in a convenient and accurate readout of UUT error for which display units
may be selected independently.
Note
If a UUT reads high (and has an Error of +Err,) it is clear that the
Instrument will have to be adjusted down by an Offset –Off to achieve the
target reading.
It is often thought that Offset and Error will merely be of opposing signs,
i.e. +Err = -Off. This is only true if Offset and Error are both expressed in
ratio units of dB. To express Error and Offset in % (or ppm), however,
while the same is approximately true for small errors, a more substantial
Error of, say, +10% will require an Instrument Offset of only -9.091% to
achieve the target reading. The two are non-linearly related. This
calculation and display feature is frequently of great benefit.
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