Section 3: Model 9100 Controls: Working with Front Panel Controls — Tutorials 3-55
Final Width = 215mm
Action Result Comment
To increase the value, while still using six significant digits, we must reduce the absolute resolution to 10µV:
Press then
+ 0.3200
0 V Instead of shift-left, we could have just pressed
six
times, but this would displace the cursor six places to the
left also.
Press
once + 0.3200
1 V With this level of reduced resolution we can increase the
value beyond the earlier limit (as far as ±3.20000V if we
wish).
Press
once + 0.3200
0 V At this resolution, we could also go down to zero.
7. Now let us introduce the action of the X10 screen key while looking for the largest positive output value at the present (10µV)
resolution:
Press the X10 screen key + 3.2000
0 V If you look at the decimal point, you will see that we are still
at the same resolution (10µV). The X10 screen key has had
the effect of multiplying the output value by ten (but isn't that
just what we expected?). Let us now try to increase the
value by incrementing:
Press
once + 3.2000
0 V No change in output value, but you should hear the warning
tone, and see the error message.
To increase the value, while still using six significant digits, we must reduce the absolute resolution to 100µV:
Press
then
+ 03.200
0 V Same effect as before: the present value is available at
lower resolution.
Press
once + 03.200
1 V With this level of reduced resolution we can increase the
value beyond the earlier limit (as far as ±32.0000V if we
wish).
Let us consolidate the exercise we have just completed, by stating the rules which govern the movement across thresholds as we
increase the value by incrementing. It appears, so far, that for each absolute resolution, there is a limited span of output values. The
span seems to increase by a factor of ten as we reduce to the next lower resolution. This is, in fact, the case, except for the largest
output values, where the span is limited to ±1050V by other means, at the lowest resolution of 10mV increments (attempts to exceed
1050V will fail, and elicit a message: 'Target too big').
But why choose to switch resolutions at values featuring '32', and not '10'? Over the range of UUT instruments, calibration points
are least likely to occur at values featuring '32'. So by switching at '32', life will not be complicated by having to switch resolutions
close to the calibration values (featuring '10' or '30') where operators may be slewing the source.
On the next page, you will find a table which shows the spans of all DCV outputs for each of the resolutions as we discuss further
the features of the 9100's continuous dynamic range.
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