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73
Using the Agilent 81101A
Warnings and Errors
NOTE
You can press SHIFT + HELP (AUTOSET) to carry out an autoset. The
instrument resets all parameters, based on the current period setting, to
remove all warning and error conditions.
An Example of Warning and Error Reporting
1
Switch on the instrument and recall the standard settings by pressing
SHIFT + STORE (RECALL) + 0.
The period is now set to 1
µ
s.
2
Switch on the output by pressing SHIFT + 0 (ON/OFF).
3
On the Output screen, move the parameter cursor to the value of the
W
IDTH
parameter (100
NS
).
4
Use the knob to make the pulse width as large as possible
(approximately 940
NS
).
This limit is intended to guarantee that the actual output pulse is
within specifications, for the actual period.
The limit is calculated taking into account a worst case combination
of minimum period from the period setting (1
µ
S
) and maximum
width from the width setting (940
NS
) together with minimum leading
and trailing edge settings (5.00
NS
).
NOTE
Note that if you now try to adjust the leading edge from its current
setting of 5.00 ns with the knob, it cannot be adjusted. This is because the
upper and lower warning limits are currently 5.00 ns. The width is at its
maximum value and width + leading edge + trailing edge <
period.
5
Press SHIFT and adjust the pulse width above its warning limit. A
flashing W appears to indicate that a warning condition has occurred.
NOTE
Note that as long as no errors occur, the output hardware is set up and
attempts to generate the required output.
6
Press HELP to see the warning message:
T
RAILING
EDGE
1
MAY
CUT
NEXT
PULSE
7
Press HELP again to return to the W
IDTH
parameter.