Operation; Introduction; General Information; Ac Power - HP 3457A Service Manual

SECTION
I l l
OPERATION
3-1. INTRODUCTION
3-2. T h e information contained in this section describes manual operation of the H P 3457A Milltimeter,
T h e contents are intendccl t o meet the needs of service personnel with emphasis o n front panel operation.
For more detailed information on overall operation, refer t o the H P 3457A Operating Manual.
3-3. GENERAL INFORMATION
3-4. AC Power
3-5. Before connecting power t o the HP 3457A, be certain the line switches on the rear panel are set f o r
your power source and that the proper fuse is installed. l~iformation f o r setting the line switches and f o r
fuse selection is located in Section I I of this manual.
3-6. Power-On
3-7. T h e MP 3457A aautomatically perfol-ms a power-on self test when it is switched on. This test takes ap-
proximately 1.5 seconds t o complete and basically assures that the instl-unient is capable of operating. T h e
test does not necessarily indicate that measurements will be accurate. The power-on self test chechs the
master processor, slave processor and the con~munication 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 f o r approximately five seconds. The address is displayed as ADDRESS-dd where "dd" is the decimal
address code of the instrument (the address is set t o decimal 22 at the factory). If the test can not be com-
pleted, the instrument will display FAILED. If this occurs, refer t o Section VllI f o r troubleshooting
procedures.
3-8. Upon completion of the Power-On Test, the instrument sets itself t o predefined conditions (Power-On
state). T h e power-on state conditions are listed in Table 3-1.
3-9. OPERATION
3-10. The following paragraphs describe basic operating procedures f o r the HP 3457A Multimeter. This sec-
tion covers only front panel operating procedures such as voltage, resistance, and current measurements.
Also included are tnanual procedt~res covering operation of the HP 4449 1 A and 44492A Multiplexer
Assemblies. For detailed operating information, refer t o the H P 3457A Operating Mant~ai.
3-1 1. Voltage Measurements (Manual Operation)
3-12. Function Selection. The measurenient function is selected by pressing the appropriate key. The volt-
age measurement functions available are D C Volts, A C Volts and DC Coupled AC Volts. The default func-
tion
is DC
Volts.
T o measure DC Voltage
-
Press the DCV function hey.
T o measure A C Voltage
-
Press the ACV
1
ACDCV function hey.
T o measure DC coupled A C voltage
-
Press the Blue SHIFT key then the ACV
/
ACDCV function hey.