HP 3478A Technical Manual page 11

The information in this manual is for the use of Service The information in this manual is for the use of Service
Trained Personnel. To avoid electrical shock, do not Trained Personnel. To avoid electrical shock, do not
perform any procedures in the manual or do any perform any procedures in the manual or do any
servicing to the 3478A unless you are qualified to do so. servicing to the 3478A unless you are qualified to do
1 1 - - 1 1 . . I I N N T T R R O O D D U U C C T T I I O O N N
1- 1-2. 2. The in Th e info forma rmati tion on in in th this m
tion, Operation, Performance, Calibration, and Service tion, Operation, Performance, Calibration, and Service of of
the 3478A Digital Multimeter. The manual is designed for the 3478A Digital Multimeter. The manual is designed for
the use of Service Trained Personnel. Other use should the use of Service Trained Personnel. Other use should
refer to the Operators Manual. This manual separated refer to the Operators Manual. This manual separated
into the following sections. into the following sections.
1-3. Section I, General Information 1-3. Section I, General Information
1- 1-4. 4. A A s sho hort rt de desc scri ript ptio ion
introduction to the 3478A is in Section 1. The section introduction to the 3478A is in Section 1. The section
also also lists lists instrument instrument
accessories. accessories.
1- 1-5. 5. Se Sect ctio ion I n II, I, In Inst stal alla lati tion
1- 1-6. 6. This s Th is sec ecti tion on ex expl plai ains
for use and includes power requirements, line voltage for use and includes power requirements, line voltage
selection, etc. The section also explains how to connect selection, etc. The section also explains how to connect
the multimeter for remote operation. the multimeter for remote operation.
1 1 - - 7 7 . . S S e e c c t t i i o o n n II III, I, O O p p e e r r a a t t i i o o n n
1- 1-8. 8. The co Th e cond nden ense sed o d ope
for the use of Service Trained Personnel, is this section. for the use of Service Trained Personnel, is this section.
For more complete instructions, refer to Operators For more complete instructions, refer to Operators
Manual. Manual.
1- 1-9. 9. Sect ctio ion I Se n IV, V, Pe Perf rfor
1-10. 0. 1-1 The The 347 3478A' 8A's Pe s Perfo
Procedures are in Section IV. The Required Equipment Procedures are in Section IV. The Required Equipment
Table and an abbreviated specification table are also Table and an abbreviated specification table are also
included. included.
1- 1-11 11. . Se Sect ctio ion n V, V, Re Repl plac
1-12. 2. 1-1 Sec Sectio tion V l n V list ists th s the re
It also includes pictures and illustrations of chassis and It also includes pictures and illustrations of chassis and
mechanical parts. mechanical parts.
GENERAL INFORMATION GENERAL INFORMATION
is man anua ual is l is fo for t r the I he Ins
n of o f t the he ma manu nual al
options, options, specifications, specifications,
on Pr Proc oced edur ures es
ns ho how t w the he 34 3478 78A i A is p s pre repa
pera rati ting ng in inst stru ruct ctio ions o ns of 34
orma manc nce T e Tes est a t and nd Ca Cali libr
rforma rmance nce Tes Test an t and Ca d Calib
acea eable ble Pa Part rts s
e repla placea ceable ble par parts o ts of th f the 34
SECTION I SECTION I
1- 1-13 13. .
1-1 1-14. 4.
manual to 3478A's with serial numbers below the ones manual to 3478A's with serial numbers below the ones
shown on the title page. shown on the title page.
1- 1-15 15. .
1-16. 6. 1-1
so.
Theory Of Operation, and Schematics are in Section VII. Theory Of Operation, and Schematics are in Section VII.
The troubleshooting information is in the form of Service The troubleshooting information is in the form of Service
Groups which are symptoms oriented (i.e., what is the Groups which are symptoms oriented (i.e., what is the
failure). The complete theory of operation is in Service failure). The complete theory of operation is in Service
nsta tall ll
Group F and the Schematics are in Service Group G Group F and the Schematics are in Service Group G
(last group). (last group).
1 1 - - 1 1 7 7 . .
1-18. 8. 1-1
the HP-IB (Hewlett-Packard Interface Bus). the HP-IB (Hewlett-Packard Interface Bus).
1 1 - - 1 1 9 9 . .
an and d
1-20. The -hp- Model 3478A is a versatile multimeter 1-20. The -hp- Model 3478A is a versatile multimeter
and and
with dc and ac volts, dc and ac currents, and resistance with dc and ac volts, dc and ac currents, and resistance
measurement capabilities. The multimeter is excellent for measurement capabilities. The multimeter is excellent for
bench use, and since it is remotely programmable, it can bench use, and since it is remotely programmable, it can
be used in measurement systems. A feature of the be used in measurement systems. A feature of the
pare re
instrument is that the reading can be displayed in either 5 instrument is that the reading can be displayed in
1/2, 4 1/2, or 3 1/2 digits. Other features are Autozero 1/2, 4 1/2, or 3 1/2 digits. Other features are Autozero
(for good stability), and an Alphanumeric Liquid Crystal (for good stability), and an Alphanumeric Liquid Crystal
Display. Display.
1-2 1-21. 1.
f 3478 78A, A,
Calibration. No mechanical adjustments are necessary to Calibration. No mechanical adjustments are necessary to
calibrate the 3478A. calibrate the 3478A.
1- 1-22 22. .
brat atio ion n
1-23. 3. 1-2
characteristics of the multimeter which are certified. The characteristics of the multimeter which are certified. The
librat ration ion
specifications are listed in specifications are listed in Table 1-1
Section IV). They are the performance standards or Section IV). They are the performance standards or
limits against which the multimeter can be tested. limits against which the
1- 1-24 24. .
e 3478t 78t
1-25. 5. 1-2
located on the multimeter's rear panel. Hewlett-Packard located on the multimeter's rear panel. Hewlett-Packard
uses a two-part serial number, with the first part (prefix) uses a two-part serial number, with the first part (prefix)
identifying a series of instruments and the identifying a series of
1-1 1-1
Sect ctio ion V Se n VI, I, Ba Back ckda dati ting ng
This This sec sectio tion ha n has in s infor format mation
Sect ctio ion n VI VII, I, Se Se Serv rvic ice e
The The 3478A' 347 8A's s T Trou rouble blesho
A A p p p p e e n n d d i i x x A A
The app The append endix h ix has a as a con conden
D D E E S S C C R R I I P P T T I I O O N N
Ano Anothe ther r exce e xcelle llent nt
SP SPEC ECIF IFIC ICAT ATIO IONS NS
Specifi Spe cificat cation ions of s of the the 347 3478A a
Table 1-1 and
multimeter can be tested.
INS INSTR TRUM UMEN ENTA TAND NDMA MANU NUAL
Ins Instru trumen ment Id t Ident entifi ificat cation i ion is by
instruments and the
TM 11-6625-3071-14 TM 11-6625-3071-14
ion whi which a ch adap dapts t ts this his
shooti oting ng Pro Proced cedure ures, s,
densed sed des descri cripti ption on of of
either 5
featu ture re fea is is Electr Ele ctroni onic c
8A are t re the p he perf erform ormanc ance e
and Table 4-1 Table 4-1 (in (in
AL ID IDEN ENTI TIFI FICA CATIO TION N
s by a ser a serial n ial numb umber er