|(Edited) HP-42S/HP-27S One Month Battery Lifetime?|
Message #10 Posted by Karl Schneider on 4 Dec 2006, 1:53 p.m.,
in response to message #1 by jacksonconsult
The HP-42S, HP-27S, HP-17B, and HP-17BII have an IR transmitter for use with an HP82240A/B printer. Each of these four calculators will transmit a print signal for every input if "TRACE" mode is set. TRACE is accessible under the PRINTER or PRINT menu as applicable. (You will see a printer annunciator flash, and experience a delay in operation while any print signal is transmitted.)
The HP-42S also provides a "master switch" for print signals -- "PRON" and "PROFF", which appear as "PON" and "POFF" under the PRINT menu. The other models do not have these functions. The user can allow printing by executing "PRON", or completely disable print signals by executing "PROFF".
The HP-27S, HP-17B, and HP-17BII also have a built-in clock that cannot be switched off. This will reduce battery life, but not to the extent that you are seeing.
Neither the HP-14B nor the HP-32S or HP-32SII have the printing or clock features, so their battery life should be quite long.
Edited: 5 Dec 2006, 12:22 a.m. after one or more responses were posted