Agilent Technologies 54502A Manuale di Servizio Scaricare il pdf (Pagina 78)

a. Press front-panel FORMAT key.

b. Move cursor to TTL (threshold field) and press SELECT.

c. Assign User defined threshold by using front-panel knob and SELECT key.

7. Voltmeter readout should indicate voltage within the range of -.975 V to -1.005

V (-.990 V % .015 V).

8. Set User defined Pod Threshold of the pod assigned in the previous step to

+ 9.9 V in the Format Specification menu.

9. Note voltmeter readout. Voltage reading should be within the range of + .975

V to + 1.0005 V (+ .990 V % .015 V).

10. If either voltage reading is not within the given range, use the procedure below

to adjust the threshold level.

a. Set User defined Pod threshold of the pod assigned to -9.9 V.

b. Adjust A1R57 for reading of -.9900 V % .0005 V. Refer to figure 4-3 for

adjustment locations.

c. Set User defined Pod threshold to + 9.9 V.

d. Note the difference between this reading and + .9900 V.

e. Adjust A1R57 so the difference in step d is halved, % .0005 V.

EXAMPLES If reading is + .9952 V, the difference is .0052 V. Adjust A1R57 for + .9926 V %

.0005 V.

If reading is + .9834 V, the difference is .0066 V. Adjust A1R57 for + .9867 V %

.0005 V.

Adjustments HP 1650B/1651B

4-8 Service Manual

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Agilent Technologies 54502A Manuale di Servizio Pagina 78