HEWLETT PACKARD (HP) 122AR
Owner's Manual

Model 122A/AR

Section I1 Paragraphs 2-1 to 2-17

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2-1. I N I T I A L I N S P E C T I O N .

SECTION II INSTA 1 AT10N 1
2-2. MECHANICAL CHECK I external damage to f the shipping carton is evident, a s k the c a r r i e r ' s agent

to be present when the instrument is unpacked. Check the instrument for external damage such as broken controls or connectors, and dents or scratches on the panel surface. I damage is evident, s e e Paragraph f 2-4 for recommendedclaim procedure and repackaging information. If the shipping carton is not damaged, check the cushioning material and note any signs of severe s t r e s s as an indication of rough handlingin transit. If the instrument appears undamaged, perform the electrical check. 2-3. ELECTRICAL CHECK Check the electrical performance of the Model 122A/ARas soon as possible after receipt. Paragraphs 5-7 through 5-20 contain the performance check procedures which will verify instrument operation within the specifications listed in Table 1- 1. This check is also suitable f o r incoming quality control inspection. If the Model 122A/AR does not perform within the specifications when received, refer to Paragraph 2-4 f o r recommended claim procedure and repackaging information.

c. At least 4 inches of tightly-packed, industry approved shock-absorbing material such as extrafirm polyurethane foam. d. Heavy-duty shipping tape f o r securing outside of carton.

2-7. PREPARATION

FOR' USE.

2-8. POWER REQUIREMENTS. 2-9. The Model 122A/AR Oscilloscope requires a power source of either 115 or 230 volts ac, *lo%, single phase, 50 to 1000 Hz, which can deliver approximately 150 watts. 2-10. 230-VOLT OPERATION.

) 2-4. C L A I M S A N D R E P A C K A G I N G .
2-5. I physical damage is evident, o r if the instruf ment does not meet specifications when received, notify the c a r r i e r and the nearest Hewlett-Packard Sales/Service Office (see list at r e a r of manual). The Sales/Service Office will arrange f o r repair or replacement without waitingfor settlement of a claim with the carrier. 2-6. The original shipping carton and packaging material, with the exception of accordion-pleated pads, should be usedfor reshipment. The accordion-pleated pads are fatigued with one use and a r e not reusable. The Hewlett-Packard Sales/Service Office will also provide information and recommendations on materials to be used if the original packaging material is not available o r is not reusable. Materials used should include:

2- 11. If the instrument is to be operated from a 230volt source, the power transformer dual primary windings must be reconnected as follows: Remove the instrument from i t s case by removing the two large screwsfrom the rear. (Model 122AR requires removal of four screwsfrom the bottom. ) Locate the power transformer primary terminals. The two outer p a i r s of terminals (1 & 2) and (3 & 4) are jumpered together, connecting the windings in parallel. Remove these two jumpers. Connect an insulated jumper between terminals 2 and 3, which connects the two windings in series. Refer to the Low-Voltage Power Supply schematic f o r details. Replace the 2. 0 amp slow-blow fuse with a 1. 0 amp slow-blow fuse.
2-12. THREE-CONDUCTOR POWER CABLE. 2- 13. For the protection of operating personnel, the National Electrical Manufacturers' Association (NEMA) recommends that the instrument panel and cabinet be grounded. The Model 122A/AR is equipped with a three-conductor power cable which, when plugged into an appropriate receptacle, grounds the instrument. The offset (round)pin on the power cable connector is the ground pin. To preserve the protection feature when operating the Model 122A/AR from atwo-contact outlet, use a three-conductor to two-conductor adapter and connect the green lead on the adapter to ground at the power outlet.

a. A double-walled carton, see Table 2-1 f o r test strength required.
Table 2-1. Shipping Carton Test Strengths

2-14. V E N T I L A T I O N R E Q U I R E M E N T S .
2- 15. The Model 122A (cabinet mount) and Model 122AR (rack mount) instruments a r e provided with adequate ventilation openings for circulation of cooling air. When operating, the instrument should be located with a t least 3 inches of clearance around the top, bottom, and r e a r of the housing.

I

Gross Weight (lbs) up to 10 10 to 30 30 to 120 120 to 140 140 to 160

I Carton Strength (test lbs)
200 275 350 500
600

2-16. I N S T A L L A T I O N OF AMBER FILTER.
2- 17. An amber filter (hp Part No. 120A-83A) is supplied with oscilloscopes having a CRT with type P7 phosphor. This filter may be installed f o r improved visual observation of displays such as single- shot phenomena or very low frequency applications. The filter will improve the long persistency characteristics 2- 1