Model 3438A Section
Vlll
device participating in that particular conversation. 7-he
three
Data BYTE Transfer CONTROL
linesare used to
implement the handshake technique.
,fi'ngerprinrs rc,ill reduc,r the acc,urac:L, qf' rhe
Multitneter. L!se 1o~c.flux content solder (-hp-
Port
No.
8090-0512) tr,hen replac.ing
c.otli/~onerlfs.
Do
not permit rrac.e.s c?f:flux- to
fOrtl! on the c.irc,uit hoard. Ohserve
/)recmirion.s ogoinst static discharge.
Do
nor
use flu..; rc/no\l(Jr.
8-50. The remaining five
GENERAL INTERFACE
MANAGEMENT
lines are used for such things as
activating all the connected devices at once, clearing the
interface, etc. Refer to Table 8-3 for the definition of each
of the management lines.
8-53. Front Panel Observations.
Without
disassembling the Multimeter, failures can often be
isolated by doing the Abbreviated Performance Tests
and by carefully observing and recording the display
indications. This is especially true if the failure is a
measurement error.
Table 8-3. General Interface Management Lines.
1
Name
1
Mnernonlc
1
Descrl~tlon
1
1
Attent~on
Interface
Clear
8-54. Refer to Table 8-4 AC Gain, 8-5
DC
Gain. and
Figure 8-12. Simplified Analog Schematic for the
following examples.
ATN
IFC
IFC
Serv~ce
Request
Rernote
Enable
End of
ldent~ty
DETERMINES the Operaflng rnode
INITIALIZES the
HP-IB system to
an
idle
state (no
act~vlty on the BUS)
SRQ
REN
ED1
ALERTS the Controller to a need fo~
Commun~cat~on
PLACES Instruments under remote
program control
INDICATES last data
transltlon
dur~ng a data transfer sequence
NOTE
Circled letters
@
through
@
are reference
/JO~~/S
to aid in carrelaring berween hlocYi,
simplified, ant1 comple~e sc.hemaric diagrams.
Table 8-4. AC Gain.
@
@
TROUBLESHOOTING
8-51.
Preliminary Troubleshooting.
lnput
10
v
lnput Amp
[Gain)
8-52. Troubleshooting procedures are performed after it
is established that there is a failure in the Multimeter
circuitry. Unless a failure is obvious, such as a blank
display, refer to the Adjustment Procedures and
Abbreviated Performance Checks before attempting to
troubleshoot the Multimeter.
The h17hrid c.irc.uit.s in the Multimeter m
yr.
he
~~ert1lunet~t~r' clotnaged hy .sta~ic discharge
Jrotn a hantl or tool when the Mulritneter
is
disassetn bled. The proceclures hrlo w must be
,followed to prevent possible damage.
Table 8-5. DC Gain.
@
@
I. Ground the hand while disassemhling
and working on the Multitneter. Conductive
w~risthands (-hp- Part No. 00970-67900) are
ovailable~for this purpose.
2.
Attac,h rile Multimeter COM tertninal
to earth ground. Touch all tools lo earth
ground to remove sturic charges hefore usit~g
thrt~l on the Multitneter.
Range
200mV
8-54(a). 100 kHz frequency response failures are most
often associated with the ac to dc converter of the post
amp
x
10 gain. This failure can also be isolated by
recording and evaluating the ranges that are in or out of
specification.
lnput Amp
(Gain)
XI
lnput
Voltage
l00mV
3.
Clse o .soldering iron tc3ith a grounded ti/,.
Ilfear c./ean c.ottot2 g1ove.v tc'herz tt.orking on
the c,irc,uit hoard. Contot~iination or
Post Amp
(Gain)
X
10
Example 1:
Post Amp
Output
1
v
OUT
OUT
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