Showing posts with label electronics. Show all posts
Showing posts with label electronics. Show all posts

3/18/2012

Sony PRS-500 Portable Reader System Review

Sony PRS-500 Portable Reader System
Average Reviews:

(More customer reviews)
I got this a few days ago after seeing the high cost to get a physical paper print of a PDF book from an online publisher.
I have many technical computer documents in PDF format that I like to read. Most of them range from 200-1500 pages; having a print copy has always been more convenient to read a few pages here and there (especially on long road trips and while on the bus / subway).
I decided to get this item as used from a seller. Overall I really like my Sony Reader. If it was not for the cost I would have given 5 stars. In addition, the following are my personal scale from 1-3 (3 being the highest):
Reading clarity 2.8: Very sharp, but the brighter the surrounding light the better the contrast. I am thinking of getting a clip-on booklight so I can read in the dark (late bus rides home). When changing pages, you can see a slight "ghost" print in 15-30% of the previous imprint. However, it is very faint, and may be the limitation of the eInk technology. Ghost images do not seem to go past 3-4 page turns, however, imprints can linger in 5-10% for up to 3-4 page turns. (It seem that the screen does a single refresh when you turn the page.)
Battery Life 3.0: I've had it for the last 4 days, reading about 3 hrs / day, and it is still has 50% battery bars from the original charge.
Portability 3.0: Lighter and thinner than most of my books.
Size 2.2: The regular screen may be too small for my PDF manuals. I use the landscape and larger font for viewing. This is perfect for a novel / story book with "medium" font setting; however, most computer books and manuals are intended to be printed much larger. The size is comparable to most story book, but since there is an option for a larger font and landscape mode, I do not mind turning more pages so that I do not have to strain my eyes.
Readability Convenience 2.5: There are only 2 font settings (small and medium). The medium size is easier for me to read, but I find myself pressing the next page button rather often. However, I can take this more conveniently than a full book (lighter, smaller), so I get more reading done. (after reading other's comment, I may need to take better care not to crack the screen, though.).
Performance 2.5: It does take time to go to the next page (about 1-3 seconds delay depending on the complexity of the next page). I find myself pressing the next button ahead of time to keep a fast reading pace.
PDF 1.9: PDF seems a little slow to go to the next page when there is a picture, image, or diagram. Also, setting it on Medium font size does seem to be consistent in PDF. The font size seems to stay at small, when you change back to small then medium again you see a larger version. Also, diagrams, drawings, pictures are very difficult and next-to-impossible to read. I look on the computer to review diagrams.
Expandability 3.0: I have a 2 gig SD memory card in mine, and I still have 95%+ free memory with over 30 books.
In addition, the following deficiencies may be important to some (mostly, not a big deal to me, but I would consider a competing product):
-No way to zoom, or apply custom zooming from 0-200% or 0-x%.
-No light source or backlit (It would be nice if they could embedd led's for night reading.)
-Has Mp3 player, but no built-in speakers. (they could have taken small speakers out their palm or phone products)
-No search feature. Sometimes when I want to recall a topic or sentence, It would be easier to run a search instead of scrolling through the pages. (makes sense, since it does not have a keyboard. when frustrated, I just use the computer).

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12/23/2011

CyberPower PR1500LCDRTXL2U Smart App Sinewave Green UPS - 1500VA/1125W AVR LCD SNMP/HTTP XL (Black) Review

CyberPower PR1500LCDRTXL2U Smart App Sinewave Green UPS - 1500VA/1125W AVR LCD SNMP/HTTP XL (Black)
Average Reviews:

(More customer reviews)
The Chinese made (see photo) "CyberPower PR1500LCDRTXL2U Smart App Sinewave Green UPS - 1500VA/1125W AVR LCD SNMP/HTTP XL (Black)" arrived in a solid, well engineered box (see photo). The gross weight of the box is 42 Kg/92.5 lbs (see photo). On the whole, the unit appears attractive and well made as there were no noticeable blemishes and flaws on the finish and surface of the unit. In short, the product projects the appearance of having been assembled in a factory with well define processes and quality control measures.
On the electrical rating of the unit itself, I find the manufactures claim of 1125 watts of net output power a bit disingenuous. According to the affixed manufacturers electrical label, the device is UL rated to draw 12 Amps at 125 VAC or 1500 VA for a net output of 1125 Watts (see photo) with 75% efficiency. That works out to a total of 1440 VA at the wall plug and 1080 watts for a typical 120 VAC house and only 1320 VA and 990 watts for a house running on 110 VAC. Maybe they exist, but I don't know of any house that is operating at 125 VAC. Hence, presuming normal load and source conditions, it would be more forthright to advertise this device with a maximum output rating of 990-1080 Watts at 110-120 VAC.
The CyberPower PR1500, though called a "UPS" by name, is in fact not a true UPS and uninterrupted. This product, by electrical design, is not a double conversion device and therefore has a transfer time up to 6 milli seconds. A true UPS, with double conversion circuitry (AC-DC-AC) has zero transfer time and truly uninterrupted with AC line lost. But, because of noise levels, electrical efficiency issues and popular perception, CyberPower, APC and other manufactures include devices such as this under the heading of UPS.
The set up and configuration instructions are incomplete and uses very small hard to read type. Also no hard copy of the manual is supplied. The only manual available is one that can be down loaded or obtain from the supplied CDROM. Not all of my power backup applications are near a computer(s) and to presume so or to disregard other applications is a bit near sighted. As for tech support, twice this week I called the phone number listed on the company web site during normal working hours (1:30pm CST) and the phone rang for several minutes with no one answering.
Although not mentioned in the instructions, the front LED display block can be removed and rotated (see photo) to accommodate horizontal and vertical placement. To rotate the LED display block, one has to insert a flat tip (standard) screw driver into a small slot (see photo) and gently and carefully lift and extract the display block. The display block is attached in the rear with a ribbon cable to the face panel so be careful not to extend this part too far. Somewhat disappointing, given today's technology and ease to set, but the displayed input voltage is off by +2 VAC as per a Fluke 187 DVM.
The on/off switch has a plastic protective flip cover (see photo) to prevent accidental cycling of the AC source. This is a nice hardware feature and one that I feel other manufactures would do well to adopt. The unit comes with a 10 foot power cord with the AC prongs set in a protective plastic sheath (see photo). Batteries were fully charged on arrival.
As an observation, during the power cycle/transfer test and yet to be quantified, I noticed that the CyberPower PR1500 produces more inverter, cooling fan noise and vibration than the combined effect produced by an APC SU1400RM2U and SU2200RM2U sine wave units I have protecting an audio system. That's because the inverter fan in the CyberPower PR1500 is not a variable speed fan and operates at full speed at all times the inverter is functioning.
Though minor, at the rear of the unit, the space between the ether cable (line out) and the AC power cord grommet (see photo) is too tight. Even though I have small hands, I still found it necessary to use a flat tip device to depress the plastic ether cable release tab to disconnect the ether cable. This clearance problem could be alleviated if the chassis designers were to rotated the ether ports in their mounts by 180 degrees, placing the ether cable depression release tab opposite to that of the power cord grommet.
Included is a set of rack mount ears (see photo), pseudo dovetail, sliding rail kit (see photo) and shoes/chock (see photo) for freestanding. The steel rails and slides are of the non roller bearing type but still very functional. The two supplied plastic shoes for setting up the UPS in the vertical orientation can be separated (see photo) into four separate chocks for setting up the device in a horizontal non rack mount placement. For a heavy product, not having to be flush with the resting surface can be very helpful such that one can get their fingers underneath the unit for easer lifting.
The CyberPower PR1500 came supplied with a full complement of cables (see photo), two 9 pin serial cables, one USB 2.0 cable, one RJ-11 telephone cable, one RJ-45 CAT5 ether cable along with a CDROM containing the management software.
Last, a three display workstation (23", 24", 22") with an Intel i7 860 CPU, 8GB DDR3, XTC Memory Cooler, Radeon 5850, NEC USB3.0/SATA6 PCIe, AVer HDTV PCIe, 2TB RAID 01, 1.5 TB eSATA HD, Scythe Fan Controller, 3X 120mm fans, 3x 100mm fans, Ultra 600W PS, BT, GB ether hub, speaker bar drawing a total of 304Ws as per the UPS, reports having an estimated run time of 44 minutes with fully charged batteries.

Minus 0.25 for how the UPS output is electrically rated.
Minus 0.25 for high noise level of the AC inverter sub system.
Minus 0.25 for incomplete and too small a print used on the instructions.
Minus 0.25 for not supplying a hard copy of the user manual.

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8/26/2011

Tripp Lite TLP810NET Protect It Surge Protector/Suppressor 8 outlets (3 Transformers) 10ft Cord 3240 Joules Review

Tripp Lite TLP810NET Protect It Surge Protector/Suppressor 8 outlets (3 Transformers) 10ft Cord 3240 Joules
Average Reviews:

(More customer reviews)
Bought one for my Dad for his computer a while back. Lightening hit a tree next to his house and a fork jumped to his roof (blew a bunch of shingles off). It ruined his TV, phone, a couple of radios and a bunch of lights. Ruined the surge protector too but it did its job, his computer was fine. Tripp Lite replaced the surge protector for free. A great product.

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Tripp Lite Lite ProtectIT 120VAC Surge Suppressor TLP810NET Surge Suppressors

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