Section 5: Using the Model 9100: Procedure Mode 5.5-3
Final Width = 215mm
5.5.3 General Sequence
As the sequence progresses, user-interaction will be required to make connections, set
UUT front panel controls and slew the output.
5.5.3.1 'OPERATOR PROMPT'
Within the procedure, prompts may appear on the screen to inform the operator. These
prompts will be concerned with connections, range switching, etc. The number and
character of the prompts are determined when the procedure is written.
5.5.3.2 'READ — SLEW SOURCE'
Within the procedure, a screen headed 'READ —SLEW SOURCE' may appear. The
following example shows a typical presentation:
TODAYS DATE TIME
V
Repeat
Prev.
Wavetek
DM25XT
ISO9000 Verification
U00231
20 V Range 19 V @ 400 Hz
READ — SLEW SOURCE
OK ABORTFAIL
Enable
Cursors
Use controls to adjust 9100 output
until UUT display is equal to the
target shown, within the limits given.
By adjusting the 9100 output until the UUT shows the target value, the actual error in the
UUT measurement can be registered, and stored within the 9100 itself. Subsequently,
this error can be printed on any results certificate.
UUT Target
9
.
Upper Limit
8.99
Lower Limit
9.
9
.
V
Applied
Value
Note about Noise when Reading
the UUT Measurement
Presence of Noise
The UUT design or external conditions can
add noise to readings obtained on the UUT.
This may vary between functions and ranges
for an individual UUT, and may or may not
be given a specification by the UUT
manufacturer.
How the Noise Appears
On a digital UUT display, this noise will
appear as a variation (digit run-around),
between maximum and minimum values.
On an analog display there will be a variation
in the position of a needle or other indication.
Slewing to a Mean Target
The 9100 'Applied Value'should be slewed
until any variation is balanced about the
'UUT Target' value as shown on the 9100
'READ — SLEW SOURCE' screen.
Allowable Limits
As well as the Target and Applied Values,
the 9100 screen also presents an 'Upper
Limit' and a 'Lower Limit' which represents
the noise specification of the UUT (±1 digit
in the example shown). For the
measurement to be valid, the variation
should be such that maximum and minimum
variations do not exceed these limits.
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