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SERVICE INFORMATION FROM HEWLETT-PAC
NOVEMBER-DECEMBER 1977




DIAGNOSTIC ASSISTANCE - SYS-
tem diagnosis consists of determining
whether the system hardware or HP-
supplied software is malfunctioning
and if so, which functional unit is
causing the problem. Your HP-IB
service specialist is available for
diagnostic assistance either by tele-
phone or a visit to your facility.


Usually, a brief phone call - com-
bined with your own expertise -
identifies the problem. In a few cases,
the problem may be elusive enough
to require on-site diagnosis by the
H ~ When You Need It
D specialist.




At the
service
PROGRAMS- areas: installatkwr and system d ga-
nosis of an apparent malfunction.
WHAT I MAP?
S INSTALUTION - When the system

sewbe special& win train
MAINTENANCE ASSURANCE PROGRAM



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COMPUTING CONTROLLER Bureau of Standards or other approp-
MAINTENANCE riate international standards organiza-
tion. With MAP, you can have your
equipment calibrated at an HP serv-
If the service problem relates to your ice center for a fixed charge per cali-
HP computing controller or one of its bration on a regularly scheduled basis
peripherals, the unit can either be which you specify. In this way, you
returned to your HP field office for re- can schedule calibration during
pair, or an HP service representative periods of light system demand.
can travel to your location for faster
on-site repair. MAP options are avail- For additional information about this
able for either return or on-site con- service contract, contact your local
troller maintenance. The on-site re- HP sales and service office.
gair option also includes any neces-
sary preventive maintenance.

Calibrating X-Y Recorders
INSTRUMENT MAINTENANCE

There are a number of distinct options
SOLID STATE
for instrument servicing. Test in- MARKER
strumentation not only can fail like GENERATOR
other system elements, but it periodi-
cally may need calibration as well. Ron Sbta,
Due to the basic nature of test and Hewktt Packard, Paremus N.J.
measuring equipment, it generally
must be repaiWcalibrated in a repair DESCRIPTION
center environment. This typically re- backup for your system. If a corres-
sults in longer turn-around time than ponding instrument in your system This solid state marker generator is
on-site repair of system controllers should fail, the dedicated spare is designed to calibrate the time-base
and peripherals. To minimize quickly dispatched to your facility. circuitry of X-Y recorders. tt replaces
downtime, there are MAP options that These dedicated instruments are electro-mechanical devices which a n
provide spare instruments during the routinely checked and calibrated by deteriorate with prolonged use, and
repair interval. HP to ensure operational readiness. If pulse generators that sometimes
you require that a dedicated spare be can't quite generate the correct inter-
maintained at your own facility, a pur- vats required for accurate recorder
The following MAP options may be time-base calibration. In addition, this
selected in various combinations to chase or lease agreement is recom-
mended. solid state marker generator aids new
provide instrument maintenance that calibration procedures that require
best fits your organization, system, greater precision in shecking sweep
and application. SHARED SPARES - When you
enter the shared spares program, you linearity. Sweep tinearity is based on
join a group of system users who the precise measurement of the dis-
tance between pulses over a full
SERVICE CENTER REPAIR - With share a common spare instrument.
These shared spares are maintained scale sweep. Obviously the generator
the Service Center Repair option your supplying the pulses should be more
instruments are repaired on an expe- in a centralized pool more distant
from your location. The cost is sig- accurate than the recorder measuring
dited basis at one of the HP regional tbm.
service centers. Here, factory trained nificantly reduced below that of a ded-
HP technicians correct all instrument icated spare; however, you do as-
malfunctions that restrict perfor- sume the risk that the shared spare
mance. This effort is aimed at getting may be in use if your instrument fails.
your repaired unit back to work in the The shared spares pool is managed
shortest possible period of time. to provide spares availability at an
However, if system downtime is criti- 85% confidence level.
cal, you may desire a backup instru-
ment while yours is being repaired. Note: The shared spares program
The following two MAP options pro- may not be offered in some countries.
vide for this contingency.
CALIBRATION - In addition to your
own need for accurate, reliable
DEDICATED SPARES -The dedi- measurements, a number of system Test Box with BNC output cabk
cated spares options reserves one or applications require that meas- connected. ample time marks on
more HP instruments specifically as urements be traceable to the National recorder.
WWW.HPARCHIVE.COM
rn
I MARKER GENERATOR
I
The marker generator's accuracy is
directly related to the accuracy of the
input voltage line frequency (typically
0.033% or better). Output rates of
1,2,5,10,20,50, and 100 seconds-
per-pulse are available, with an ap-
proximate pulse width of 20 ms. The
output level is adjustable from 0 to
+2.5 Vdc, and internally protected
against short circuits. Pressing the
RESET switch on the front panel will Test box wlth cover removed.
hold off the generator pulses while
you make adjustments to the X-Y
recorder under test. The RESET
switch is also used to reset the
generator's count on long sweeps of U2 to get the three basic signals of
50 or 100 second intervals, or to in-
itialize the generator after turn-on.
OSHz, l.OHz, and 2.OHz. Only one of
the three gates A, B, or C is selected I
(made high) by the TIME INTERVAL i
;
OPERATION switch in any of its positions. This RON SLOTA
allows only one of the basic signals to "lfIvmtOr, designor, bullder. u e . '
sr'
Operation is straightforward with only pass through the U6 OR gate (pin 3 . )
one control. By simultaneously releas- Ron Slota, who has been with
ing the RESET button and energizing U5 and U7 are divide-by-ten coun- Hewlett-Packard 9 years, is an in-
the recorder sweep, you can start the ters. The INTERVAL switch selects strument service technician at the
pen very close to the first grid mark none, one, or both of them to further HP Eastern repair center in
on the paper. However, do not use divide the basic signal. When Gate D Paramus, New Jersey (Paramus is
this first mark as part of the sweep located within the metropoKtan area
is low (0.OV) U5 is selected, and of New York City). In additon to his
calibration due to possible inac- when Gate E is high (+5.0V) U7 is regular duties of instrument repair,
curacies in operator reflex or pen selected. Ron also writes auto test programs
drop delay. for HP 9825 Calculator-driven in-
The signal finally passes through U9, struments.
THEORY OF OPERATION a monostable multivibrator that pro- Ron enjoys gardening, carpen-
vides the 20 ms wide pulses at what- try and ham radio. He is married
The 60Hz sync signal is divided to ever rate has been previously and lives in Wanaque, New Jersey.
6.OHz by U1 and further divided by selected.
.I*




1
4




--- 1,
". call your local HP their facilities and moving to larger
quarters. Occasionally an additional
To make sure that you can easily lo-
cate your local HP office to obtain the
office is added to serve an area. service you have come to expect of
These changes may mean that an HP Hewlett-Packard, here's an up-to-date
office is now more conveniently lo- listing of field offices for all areas of the
That's a phrase frequently seen in HP cated for you. world.
pubtications. It appears with shipping
instructions, parts ordering information An asterisk (*) by the office serving
and service literature. That phrase your area indicates that there has
reminds you to call your local HP office Although many HP manuals and other been a change in address or tele-
if you need help. But to do that you publications contain a complete list of phone number, etc. during the past
must know where to find your local HP HP offices, the list may not be com- year. It may be helpful to note this new
office. As HP continues to grow, many pletely current since it is revised only information and to pass it along to
offices find themselves outgrowing when the publication is reprinted. others in your facility also.




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