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Errata

Title & Document Type: 210A Square Wave Generator Instruction and OperatingManual

Manual Part Number: N/A

Revision Date: N/A

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INSTRUCT ION AND OPERAT ING MANUALFOR

MODEL 2l0ASQUARE WAVE GENERATOR

Seria l 1112 and Above

HEWLETT-PACKARD COMPANY395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U. S. A .

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G e n e r a l DescriptionThe Model 2l0A Square Wave Genera to r is an excel lent source of squarewaves hav ing a fundamenta l f requency range of 20 to 10,000 cyc les / sec . The

ins t rument will operate with an input voltage of 2 to 200 volts and produce amaximum output voltage of 50 volts peak to peak. open circui t . An outputattenuator is provided which wil l a l te rna te the output voltage up to 70 DB. Theoutput vol tage is balanced to ground.

This square wave genera tor is useful fo r product ion and exper imenta lt es t s of rece ivers . video ampl i f ie rs . ne works. and t ransmi t ters .

Parts SubstitutionsDifficult ies in procur ing some of the par ts used In this ins t rument may

cause the electr ical o r phys ic al values to deviate f rom those shown in this in -s t ruct ion manual . These subst i tut ions have b ee n mad e so as not to impa i r theper formance of this ins t rument . Whenever rep lacement of any of these pa r t sis necessary . ei ther the subst i tu te value or the original value may be used.

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INSTRUCT IONSMODEL 210A

SQUARE WAVE GENERATOR

Sp e c i f i c a t i o n sFrequency Range - -

20 to la, 000 cyc les /sec .Inpu t Volt age - -

2 to 200 voltsInput Im.pedance - -

25, 000 ohm.sOutpu t Volt age - -

50 volts peak to peak, open circuitOutput Voltage Wave Shape - -

Voltage r i ses to 90% of m.axim.um. in 1 m.icrosecond. F la t top of wavedecays l ess than 1%.Internal Im.pedance

1000 ohm.s balanced to groundOutput Attenuator - -

To ta l a tt enua to r 70 db in 5 db s teps . Attenuator does not a ff ec t thewave shape of the output voltage a t frequencies below 10 , 000 cycles /sec .Power Supply Rating - -

Voltage - 115 voltsFrequency - 50/60 cyclesWattage - 100 watts

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Overal l Dimensions - -Cabinet Model -15-1/4" wide x 7-1/4" high x 10-5 /8" deepRack Model -19" wide x 7" high X 10-3 /4" deep

Pane l - 19" wide x 7" highDepth behind panel - 9-1/4"Weight - -

Cabinet - 37 poundsRack - 38 poundsO p e r a t i n g Instructions

In sp ec io nThis ins t rument has been thoroughly tested and inspected before beingshipped and is r ea dy f or use when received.After the ins t rument is unpacked, the ins t rument should be careful lyinspected for damage received in t rans i t . I f any shipping damage is fo und, fo llowthe procedure outlined in the IlClaim fo r Damage In Shipment" page a t the back ofthis instruct ion book.

Controls and TerminalsINPUT - The bInding posts marked INPUT and G are input te rmina ls ofthe ins t rument . An ex te rna l sine wave which is to be sq uare is fed in to the in

s t rument through these t e rminals . The control marked INPUT is used to controlthe ampli tude of the i npu t vo lt age . ThIS control is cal ibrated from 0 to 100 inarbi t rary uni ts .

OSC. D 601\, - This toggle switch is provided so that an external voltage ora 60 cycles vol age from a secondary of the power t ransformer , may be suppliedto the input of the ins t rument . When the switch is in the OSC. posit ion the exte rnal voltage IS used . In the 601\, posit ion the vol ta ge t aken f rom the power t r ans fo rmer is used. The INPUT control does not control the ampli tude of the in te rna lvoltage.

OFF D ON - This toggle switch controls the power suppli ed to the ins t rumenfrom the power l ine. When the swi tch is in the ON posit ion, the i nd ic a to r i n theenter of the on tro l pane l i s l igh ed.

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DB - The at tenuator is used to r educe an es tabl i shed outpu t vo lt age by anynumber---ot"decibels up to 70 db. The in terna l impedance remains constant r ega rd les s of the set t ing of the at tenuator .

Output - This group of three binding posts a re th e o utp ut t e rmina ls of theins t rument . The binding pos t marked G i s connected to the chass i s w hile th e othetwo binding post s a re connected to the at t enuator .

Fuse - T he fu se is loca ted in a fu se b lo ck n ex t to the power cable on theunderside of the chass i s . Remove the bo tt om p la te to gain access to the fuse.Opera t ion

The procedure f or o pe ra tin g this ins t rument is as follows:1. Turn the p o we r s wi tc h to ON. Connect th e O UT PU T t e rmina ls tothe equipment under tes t .2. I f a 60'\ square wave is d esired , se t the OSC. -60' \ toggle switch

to the 60'\ posi t ion.3. Set the to gg le switch to the OSC. posi t ion and apply a sine wavevoltage of the des i red f requency to the INPUT t e rmina ls i f a square wave otherthan the f requency of the p ow er lin e is d es ir ed .

CAUT IONThe maximum vo lt age appl ied to th e IN PU T t erm in al s mu st not exceed

200 volts RMS.4. I f the input voltage does not exceed approximately 25 vol ts , theINPUT control should be se t at 100. T his con tro l m ay be used to reduce the

i npu t vo lt age when vol tages above 25 vol ts a re encountered.

When balanced output is des i red , the balance between the tw o s ides ofthe output c i rcu i t can be measured with a vol tmeter . Connect a DC vol tmeterbetween the tw o OUTPUT t e rmina ls and measu r e the vol tage . A vol tagebetween the t e rmina ls of not more than 3 volts represents a sa t i s fac torybalance .

The output c i r cu i t m ay be u se d fo r s ingle ended operat ion by connectingthe equipment being dr iven between the ground (G) t e rmina l and e i ther of theother OUTPUT t e rmina ls . I t is neces sa ry to use a coupling capaci tor andgr id r e s i s to r between the output of the Model 2l0A and the grid of the tubebeing dr iven w hen the output c ir cu it i s connected f or s in gle ended operat ion.

The in terna lThis imped-5. Adjust the at tenuator (DB) for des i red output vol tage .impedance of th e o utp ut c i rcu i t is 1000 ohms balanced to ground.ance is not affected by the set t ing of the at tenuator .

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Circuit DescriptionThe Model 210A Square Wave Genera tor is d esig ne d to change a sinewav e in to a square wave.Tubes VI and V2 amplify and clip the peaks of the sine wave a pp lie d

to the input t e rmina ls of the ins t rument . Tube V3 se rves as a phase in ve r te r which feeds the par t ia l ly squared wave to the tw o sect ions of thedirec t coupled amp li fi er con si st ing of tubes V4, V5, V6, V7. The twooutput tubes V5 and V7 feed into the ou tp ut at tenuator which cont ro l s theampli tude of the square wave obt ai ned a t the output t e rmina ls .

Two power suppl ies are provided to mee t the requi rements of thedirec t coupled ampl i f i e r .

M a in t e n a n ceCover and Bottom Pla te Remova l - -

The cover is r emoved by unscrewing the four screws which fastenthe cover to the back of the ins t rument and sliding the cover toward the r ea rof the ins t rument .

The bot tom p la te is rem oved by unsc rewing the four sc rews , one ineach co rne r of the bot tom plate, which fasten the plate to the chas s i s .Tube Replacement -=

When replacing tube V5 and /o r V7. the outpu t shou ld be checked tosee tha t the rep lacement tube has not caused excess ive unbalance . I t maybe neces sa ry to try severa l tubes before a sat isfactory tube is found.Trouble Shoo in gSymptomsIns t rument inoperat ive( indicator l amp won1t l ight .no square wave output)Ins t rument inoperat ive( Ind ica to r l amp l ights

CausesBlown fuse

Defec t ive tube;Che ck bot h 5Y3GTtubes f i r s tShor t c i rcu i t inapaci tor C5, C6AB.

o r C3.The r es is ta n ce a c ro s sC5 should be a t l ea st11.000 ohms and ther es is ta n ce a c ro s s C6Ashould be at l e a s t300. 000 ohms .

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RemediesC le ar s ho rt c irc ui tand rep lace fuse

Replace defec t ivetube

Rep la ce de fe ct iv ecapaci tor

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