HP Omni 120-1000 Instruction Manual download pdf (Page 28)

1. Instrument description: name and catalog and serial

numbers. Refer to front and rear panels.

2. Part number of board. Refer to the parts lists in this manual. (The

number etched in the foil is generally NOT the part number.)

3. Your purchase order number. This number facilitates billing if the unit is

out of warranty and serves to identify the shipment. The repair facility will

arrange for the prompt delivery of a replacement.

To prevent damage to the board, return the defective board in the packing

supplied with the replacement (or equivalent protection). Please identify the

return with the Return Material number on the tag supplied with the

replacement and ship to the address indicated on the tag.

New Boards. For equally prompt replacement of any etched-circuit board,

and for maximum life expectancy, order a new one. Use the same procedure

as described above, but request a new board. Please return the defective one

to GenRad.

5.4 PERFORMANCE VERIFICATION.

This procedure is recommended for verification that the instrument is

performing normally. No other check isgenerally necessary because this

procedure checks operation of nearly all the circuitry. There are no

calibrations or adjustments that could require resetting; and the internal stan-

dards are very stable. (However, for a rigorous performance and accuracy

check, refer to para 5.5.) The necessary resistors, capacitors, and inductors

are inexpensive and readily obtained. The most accurate ones available

should be used; tolerances listed are the "best" commonly catalogued. Refer

to Table 5-1.

CAUTION

Be sure the Iine voltage switch, rear panel, is correctly set for your

power Iine voltage.

Verify performance as follows:

a. Set the line voltage switch, connect the power cord,

and depress the POWE R button.

b. Press the PARALLEL/SERIES button, if necessary,

so that the SERIES light stays lit.

c. Press FUNCTION button R.

d. Press the FREQUENCY button, if necessary, so that

the 120 Hz (100 Hz) light stays lit.

e. Press the RANGE 1 button.

f. Install the test fixture adaptors, as described in para 3.2.

Insert the 49.9-0 resistor as the device to be tested or "unknown"

component (DUT).

g. Verify that the displays are within the extremes shown in "check number

1" in Table 5-2, if the resistor value is within the tolerance listed above.

h. Similarly make the other checks indicated in this table. In check number

12, verify that the 5th digit is reasonably stable, as follows. (Notice that the 4th

digit is the least significant one in the readout, for 0.2% accuracy.)

i. In check number 12, the flickering of the 5th digit should stay typically

with in a range of +/-3 counts. For example, if the display is 1.101 X,uF, the "X"

might fIicker between 2 and 8 (or a smaller range). If, for example, "X" is

flickering between 7 and 13, it will of course cause a flickering of the preceding

digit (1.1017 to 1.1023). In such a case, the correct readout is the larger 4-digit

number (1.102) and the 5th digit is acceptably stable.

Tolerances. Acceptable performance of the instrument is bracketed by the

set of display "extremes" in Table 5-2. These are defined as the nominal (ideal)

measurements plusor-minus the sum of the instrument accuracy tolerance and

twice the DUT accuracy tolerance. If the accuracy of your DUT is different from

the recommendation, revise the acceptable "extremes" accordingly. Notice that

this performance verification is NOT intended to prove the accuracy of the

instrument.

5-2 SERVICE

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HP Omni 120-1000 Instruction Manual Page 28

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