HP 3457A Service Manual page 45

SECTION III
OPERATION
3-1. INTRODUCTION
3-2. The information contained in this section describes manual operation of the HP 3457A Multimeter,
The contents are intended to meet the needs of service personnel with emphasis on front panel operation,
For more detailed information on overall operation, refer to the HP 3457A Operating Manual.
3-3. GENERAL INFORMATION
3-4. AC Power
3-5. Before connecting power to the HP 3457A, be certain the line switches on the rear panel are set for
your power source and that the proper fuse is installed. Information for setting the line switches and for
fuse selection is located in Section II of this manual.
3-6. Power-On
3-7. The HP 3457A automatically performs a power-on self test when it is switched on, This test takes ap-
proximately 1.5 seconds to complete and basically assures that the instrument is capable of operating. The
test does not necessarily indicate that measurements will be accurate. The power-on self test checks the
master processor, slave processor and the communication isolation circuitry (three of the ten tests perform-
ed by the complete self test). Upon satisfactory completion of the test, the instrument will display its HP-IB
address for approximately five seconds. The address is displayed as ADDRESS-dd where "dd" is the decimal
address code of the instrument (the address is set to decimal 22 at the factory). If the test can not be com-
pleted, the instrument will display FAILED. If this occurs, refer to Section VIII for troubleshooting
procedures,
3-8. Upon completion of the Power-On Test, the instrument sets itself to predefined conditions (Power-On
state). The power-on state conditions are listed in Table 3-1.
3-9. OPERATION
3-10. The following paragraphs des sic Operating procedures for the HP 3457A Multimeter, This sec-
tion covers only front panel operating procedures such as voltage, resistance, and current measurements.
Also included are manual procedures covering operation of the HP 44491A and 44492A Multiplexer
Assemblies. For detailed operating information, refer to the HP 3457A Operating Manual.
3-11. Voltage Measurements (Manual Operation)
3-12. Function Selection. The measurement function is selected by pressing the appropriate key. The volt-
age measurement functions available are DC Volts, AC Volts and DC Coupled AC Volts. The default func-
tion is DC Volts.
® To measure DC Voltage - Press the DCV function key.
© To measure AC Voltage - Press the ACV / ACDCV function key.
© To measure DC coupled AC voltage - Press the Blue SHIFT key then the ACV / ACDCV function key.
3-1