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How do you set to Double Precision mode for 34S?
01-16-2017, 02:10 AM
Post: #1
How do you set to Double Precision mode for 34S?
How do you set the 34S to Double Precision mode...I know its probably in the documentation, but cant seem to find it.
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01-16-2017, 03:35 AM
Post: #2
RE: How do you set to Double Precision mode for 34S?
In the MODE catalogue. Press D and you'll get to DBLOFF, you want DBLON which is immediately below.

Pauli
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01-16-2017, 04:15 AM
Post: #3
RE: How do you set to Double Precision mode for 34S?
(01-16-2017 03:35 AM)Paul Dale Wrote:  In the MODE catalogue. Press D and you'll get to DBLOFF, you want DBLON which is immediately below.

Pauli

OK, when you get there, how do you invoke that feature...?
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01-16-2017, 06:46 AM
Post: #4
RE: How do you set to Double Precision mode for 34S?
(01-16-2017 04:15 AM)zeno333 Wrote:  OK, when you get there, how do you invoke that feature...?

As usual: press ENTER or XEQ.

Dieter
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01-16-2017, 08:25 AM
Post: #5
RE: How do you set to Double Precision mode for 34S?
Perhaps you need the manual Smile

- Pauli
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01-16-2017, 04:49 PM
Post: #6
RE: How do you set to Double Precision mode for 34S?
BTW there is no way to programmatically displays the 18 trailing digits in DP mode?
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01-16-2017, 09:37 PM
Post: #7
RE: How do you set to Double Precision mode for 34S?
I'm sure a program could be written to display the extra digits:

To get the second 12 digits:

set round to zero mode,
round to 12 digits,
subtract from the original number.

Do this again to get the final 10 digits.


Pauli
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01-17-2017, 08:36 PM (This post was last modified: 01-17-2017 08:55 PM by Dieter.)
Post: #8
RE: How do you set to Double Precision mode for 34S?
(01-16-2017 09:37 PM)Paul Dale Wrote:  To get the second 12 digits:

set round to zero mode,

"Round to zero" is round mode 4, i.e. truncation (instead of the standard mode 0 that rounds to even).
The round mode is set by the RM command which is part of the MODE menu.

(01-16-2017 09:37 PM)Paul Dale Wrote:  round to 12 digits,

Round to 12 significant digits. This is accomplished by the RSD command that can be found in the X.FCN menu.

(01-16-2017 09:37 PM)Paul Dale Wrote:  subtract from the original number.

Yes. ;-)

So all in all it's a procedure like this:

Code:
RM 4                                  // set round mode to truncation
[SCI] 11                              // always show 12 significant digits

17 [1/X]         5,88235294118 E-2    // 1/17 rounded 12-digit display precision
[ENTER] RSD 12   5,88235294117 E-2    // first 12 digits
[-]              6,47058823529 E-14
[ENTER] RSD 12   6,47058823529 E-14   // next 12 digits
[-]              4,11764705800 E-26   // last 10 digits

RM 0                                  // reset standard round mode

Dieter
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