Self Test; Introduction - HP 3457A Service Manual
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- Operating instructions manual (363 pages) ,
- Service manual (6 pages) ,
- Service manual (273 pages)
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3457A
Service
8-35. Upon satisfactory completion of the power-on test routine, the instrument momentarily displays the
HP-IB address it is currently set t o (The address is set t o decimal 22 at the factory), emits a single "beep" and
sets itself t o the predefined power-on state. The front panel indications of this state are; the DC Voltage
function, Auto-Range and automatic trigger are selected. For a complete list of power-on conditions, refer
t o Section 111, Table 3-1 of this manual.
8-36. Self Test
8-37. The
TEST
routine performs an extensive test of the HP 3457A's measurement capability and accuracy.
The tests performed are active tests, that is, a stimulus is applied and the results are checked against
predefined limits. The
TEST
routine tests the integrator convergence, input amplifier and switching offset,
ohms current source, input divider, input amplifier gain selection, amps circuit, ac/dc convertor offset and
frequency response, and ohms precharge circuit.
8-38. Satisfactory completion of the self test routine is indicated by a display message of
SELF TEST
OK. If
an error is detected, the display message will be
TEST FAILED
and the error annunciator will flash. When
an error occurs, bit 0 in the ERROR register is set and information indicating the specific test@) that failed
is stored in the AUXERR register.
8-40. Introduction
8-41. The following procedures employ the Self Test capabilities of the HP 3457A. In most cases, this will
be sufficient t o determine which of the two sections (A1 Chassis Common Section or A2/A3 Floating
Common Section) is at fault.
This in.s/rlrment contains infcgratcd circuits which arc sirsccptihlc to faillrrc drrc to
static discharge. I f is especially important that grorrnded tools and wrist straps be
rised when handling or tror~hleshooting thesc components.
8-42. A1 Assembly Failure Indications
8-43. If the front panel display remains blank or contains some unintelligible message and appears t o be
"locked-up" after the instrument is "turned-on," the fault is most probably located on the A1 assembly
(03457-66501). If the display is blank, the power cord, fuse, and line select switches should be checked t o be
certain the instrument is receiving power. Connectors Al-J501, Al-J701 and Al-702 should be checked t o
be sure they properly and securely connected.
8-44. If the instrument works properly from the front panel but fails t o communicate over the HP-IB, the
problem is due t o a faulty A1 assembly. Be certain that the interface cable is good and that it is securely
connected between the HP 3457A and the controller when testing HP-IB communications.
8-45. If the display reads FAILED after the instrument is "turned-on," the fault is due t o either a slave
processor failure or an isolation logic circuit failure. Since the isolation logic circuit is located on both the
A1 and A2 assemblies, the fault can not be isolated t o one assembly.
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