HP 10413 Datasheet download pdf (Page 166)

166

The + and - keys are disabled in mode,

since their effects are controlled instead by the

↑ and ↓ keys once the highlight is on the ‘a’

coefficient. The (-) key controls the sign of ‘a’.

Self test mode

The final key is labeled . This key will present the student with a series

of graphs for which they must supply the equation. The type of graph is

governed by the current setting of . For example, if the current setting

of was at

YX v=+ then the test graphs would also only use the v

parameter instead of a, h and v simultaneously. The setting of can be

changed within the screen using the key supplied.

There are two levels of ‘questions’ denoted by the keys and on

the screen. An question will be in the

main screen (-5 to 5 on each axis), whereas a

one can be anywhere in the larger

screen (see right). The setting of also

affects the difficulty of the question. The first is

always but you can substitute another

by pressing or .

In mode you must use the arrow keys to

change the parameters ‘a’, ‘h’ and ‘v’ until they

match the graph shown. The accuracy of your

answer can be checked by pressing the key

labeled , which appears as soon as you

begin to change the values. The number of

attempts is monitored and displayed.

An incorrect answer is shown as an ‘animated’ graph on the screen when

you press

, flashing repeatedly between the required graph and your

incorrect guess. This has to be seen to be appreciated - a screen shot can’t

do it justice. If your guess and the required graph can’t be shown on the

same screen then this animation may not be possible. If you are unable to

find the answer, pressing

will display the correct parameters.

When you are successful, or when you give up, press either or

for a new graph, or to return to the main screen.

If you go to HP’s website you can download a worksheet for use with your

class. It takes the student through the process of deducing the effects of

each of the coefficients on the shape of the graph, requiring them to record

their answers in writing.

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HP 10413 Datasheet Page 166