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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of National Products Inverter, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
What is an instruction?
The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of National Products Inverter one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of National Products Inverter. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of National Products Inverter should contain:
- informations concerning technical data of National Products Inverter
- name of the manufacturer and a year of construction of the National Products Inverter item
- rules of operation, control and maintenance of the National Products Inverter item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of National Products Inverter alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of National Products Inverter, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the National Products service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of National Products Inverter.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the National Products Inverter item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
TL/F/6353 54LS14/DM74LS14 Hex Inverters with Schmitt Trigger Inputs June 1989 54LS14/DM74LS14 Hex Inverters with Schmitt Trigger Inputs General Description This device contains six independent gates each of which performs the logic INVERT function. Each input has hyster- esis which increases the noise immunity and transforms a slowly changing input[...]
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Page 2
Absolute Maximum Ratings (Note) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 54LS b 55 § Ct o a 125 § C DM74LS 0 § Ct o a 70 § C Storage Temperature Range b 65 [...]
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Page 3
Switching Characteristics at V CC e 5V and T A e 25 § C (See Section 1 for Test Waveforms and Output Load) R L e 2k X Symbol Parameter C L e 15 pF C L e 50 pF Units Min Max Min Max t PLH Propagation Delay Time 52 282 5 n s Low to High Level Output t PHL Propagation Delay Time 52 2 1 0 3 3 n s High to Low Level Output 3[...]
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Page 4
Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier (E) Order Number 54LS14LMQB NS Package Number E20A 14-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS14DMQB NS Package Number J14A 4[...]
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Page 5
Physical Dimensions inches (millimeters) (Continued) 14-Lead Small Outline Molded Package (M) Order Number DM74LS14M NS Package Number M14A 14-Lead Molded Dual-In-Line Package (N) Order Number DM74LS14N NS Package Number N14A 5[...]
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Page 6
54LS14/DM74LS14 Hex Inverters with Schmitt Trigger Inputs Physical Dimensions inches (millimeters) (Continued) 14-Lead Ceramic Flat Package (W) Order Number 54LS14FMQB NS Package Number W14B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPR[...]