Section 3: Model 9500B Controls: Modes of Operation 3-7
Final Width = 215mm
Descriptions assume 9500B/1100
3.3.1.6 Deviation Display
The deviation of an output signal amplitude from the factored output
step value is controllable, within ±11.2%, from the function screen. So
a signal of 1V DC can be adjusted from 0.8880V to 1.1120V using the
deviation control.
To extend the usefulness of this facility, the deviation display value can
be expressed as 'UUT Error'. This permits use of the deviation control
to adjust the 9500B output until the UUT oscilloscope presentation
itself shows the required value. The 9500B output value can be read off,
but in addition, the UUT's error is presented on the 9500B screen.
Note that both the UUT error and the deviation are expressed as a
percentage (ratios). This means that if the deviation has to be adjusted
to +10.00%, the UUT error is -9.091%. An example will show why:
Example of 'UUT Error'
1. Assume a 1V UUT nominal cal point.
2. 9500B set to 1V: UUT reading is low.
3. 9500B 'Deviation' increased until UUT reading is 1V nominal —
Deviation value is +10% and 9500B output is 1.1V.
4. A UUT reading of '1V' represents 1.1 x 1V, so UUT original reading
for 1V input was 1V ÷ 1.1 = 0.909091V.
5. The UUT Error is therefore 0.909091V - 1V = -0.09091V.
6. The UUT percentage Error is (0.09091V ÷ 1V) x 100%,
= -9.09091%
To change the Deviation parameter:
1. Use the tab key to position the cursor on the Deviation display
parameter.
2. Use the spinwheel or up/down cursor keys to toggle between
'Deviation' and 'UUT Error'.
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