HEWLETT-PACKARD 890A Repair Manual

$7.99

HEWLETT-PACKARD 890A - It's a complete service manual, and it's in PDF format. It contains circuit diagrams ( schemas ) etc. It also usually contains parts catalog. After placing order we'll send You download instructions on Your email address. See below for delivery information

The manual is available only in language(s): English

Link to manual will be sent on Your email address after You place order.

This product was added to our catalog on Tuesday 15 April, 2008.

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Charles Dussier - 12/05/2006

Super vraiment excellent! la qualit� d'image est vraiment au rendez vous. fichier recuperrable dans la journ�e c'est impeccable! Fichier qui etait introuvable, je l'ai enfin ! merci !!:)

Adam Solitro - 12/24/2007

A BIG Thank you!!!! Merry Christmas and Happy New YEAR!!!

Jim Carrier - 08/02/2006

Outstanding and fast service! I received service manual in a moment after order. Thanks to this manual I can use my printer again!

Glen Meyer - 10/26/2008

Very fast service, manual is well scanned and clear, but the Appendix A containing PC Command table and Control codes are missing

James Thorp - 12/28/2006

Great original Yamaha manual and no problems at all with the ordering process. Will definitely use this website again and would recommend it to anyone else. James Thorp

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Click to see text excerpt from the manual

external programming rheostat or potentiometer should be a wire-
wound device with a temperature coefficient o? 30 ppm or better.
The potentiometer must be capable of carrying ? .3 ma or more. It
is also recommended that the programming lead be shielded and the
shield connected to the ground of the supply. See Figures 3 and 5.
CAUTION: 1. If the Programming terminals are open circuited the
output voltage will rise well in excess of 320 volts
and damage to the supply may result if operated in
this condition over a prolonged period.
2 . A rapid turndown of the programming potentiometer,
internal or external, may burn out the potentiometer.
It is recommended that the programming potentiometer
be turned down no faster than the voltage needle falls
on the front panel meter .
SPECIAL CONSIDERATIONS
PROGRAMMING RESISTANCE
It has previously been warned that a rapid turndown could
damage the programming potentiometer. While it is unlikely that
the internal programming potentiometer will be burned out by even
an instantaneous turndown from 320 volts to zero, it is possible to
overheat the lower resistance region of the resistance element and
thus cause it to become noisy at the low end. Mrhen the supply is
heavily loaded a reasonably rapid turndown will not be detrimental
to the potentiometer.
PROGRAMMING RATES
The maximum safe rising programming rate is about 50 volts/
sec. The maximum falling programming rate is determined by the
load current and the supply capacitance. At heavy output currents
down programming rates up to 50 volts/second are feasible whereas
at low voltage and no load the down programming rate may be as low
as 1/2 volt/second.
SHORTING THE SUPPLY
The supply is designed only to sustain a shortcircuit across
the load terminals. Inadvertent shorts between one of the output
terminals and the sensing on the A terminals will result in the fail-
ure of the instrument. It is important to insure that the sensing
terminals are tight and that the shorting occurs on the output terminal
leads and not on the sensing leads.