Hewlett-Packard 3438A digital multimeter Operating and Service Manual

 Serial Numbers 1717A00330 and Greater
IMPORTANT NOTICE
Any changes made in instruments manufactured after
this printing will be found in a “Manual Changes”
supplement, supplied with this manual. Be sure to
examine this supplement, if one exists for this manual,
for any changes which apply to vour instrument and
record these changes in the manual,
To help minimize the possibility of electrical fire or shock
hazards, do not expose this instrument to rain or
excessive moisture.
Manual Part No. (3438-90001
Microfiche Part No. 03438-90051
Copyright Hewlett-Packard Company 1976
P.O. Box 301, Loveland, Colorado, 80537 1.5. A,
Printed:
February 1978
H
CERTIFICATION
Hewlett-Packard Company certifies that this instrument met its published
specifications at the time of shipment from the factory. Hewlett-Packard
Company further certifies that its calibration measurements are traceable to the
United States National Bureau of Standards, to the extent allowed by the
Bureau's calibration facility, and to the calibration facilities of other
International Standards Organization members.
WARRANTY AND ASSISTANCE
This Hewlett-Packard product is warranted against defects in materials and
workmanship for a period of one year from the date of shipment, except that
in the case of certain components, if any, listed in Section of this operating
manual, the warranty shall be for the specified period. Hewlett-Packard will, at
its option, repair or replace products which prove to be defective during the
warranty period provided they are returned to Hewlett-Packard, and provided
the proper preventive maintenance procedures as listed in this manual are
followed. Repairs necessitated by misuse of the product are not covered by this
warranty. NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
HEWLETT-PACKARD IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES.
If this product is sold as part of a Hewlett-Packard integrated instrument
system, the above warranty shall not be applicable, and this product shall be
covered only by the system warranty. |
Service contracts or customer assistance agreements are available for
Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service
Office. Addresses are provided at the back of this manual.
Model 3438A
Section |
SECTION |
GENERAL INFORMATION
1-1, INTRODUCTION.
1-2. This section contains general information con-
cerning the -hp- Model 3438 A Multimeter. Included isan
instrument description, specifications, information
about instrument and manual identification, option and
accessory information, and safety considerations.
1-3. DESCRIPTION.
1-4. The -hp- Model 3438A is an HP—IB compatible,
314 digit, five function, auforanging multimeter. The
functions are AC and DC Voltage, AC and DC Current
and Ohms. All five functions have manually selectable
ranges. AC and DC Voltage and Ohms functions may
also be automatically ranged by depressing the AUTO
pushbutton.
1-5. The 3438A enables the user to set up a low cost data
gathering system utilizing the HP—IB. Voltage (ac or
de), Current (ac or de) and resistance information can be
transferred on the HP—1B to Printers, Caiculators, and
Computers for data storage or hard copy printouts.
1-6. Throughout the remainder of this manual, the -hp-
Model 3438A Multimeter will be referred to as
Multimeter.
1-7. SPECIFICATIONS.
1-8. Specifications for the Multimeter are listed in
Table 1-1. These specifications are the performance
standards or limits to which the Muitimeter can be tested.
Any changes in these specifications due to manufacturing
changes, design or traceability to the National Bureau of
Standards will be covered by an errata or change sheet.
These specifications supersede any prior published
specifications. Supplemental information in Table 1-218
provided to describe general operating characteristics.
1-9, INSTRUMENT AND MANUAL IDENT-
IFICATION.
1-10. Hewlett-Packard uses a two-section serial
number. The first section (prefix) identifies a series of
instruments. The last section (suffix) identifies a
particular instrument within the series. A letter between
the prefix and the suffix identifies the country in which
the instrument was manufactured. The manual is kept
up-to-date at all times by means of a change sheet which
is supplied with the manual. If the serial number of your
instrument differs {rom the one on the title page of this
manual, refer to the change sheet supplied with the
manual, All correspondence with Hewlett-Packard
should include the complete serial number,
1-11. OPTIONS.
1-12, Table 1-3 lists the options available for the
Multimeter,
1-13. The option label affixed to the rear of the
Multimeter identifies the line voltage for which the
instrument is wired, This operating voltage can be
changed by following the procedure outlined in Section V
(Power Requirement Modification Instructions). If the
line voltage option is changed, the option label should
also be corrected to reflect the new configuration.
1-14. ACCESSORIES,
1-15. The accessories avallable for use with the
Multimeter are listed in Tabie 1-4.
1-16. SAFETY CONSIDERATIONS.
1-17. This Operating and Service Manual contains
cautions and warnings alerting the user to hazardous
operating and maintenance conditions. This information
is flagged by a caution or warning heading and/or the
symbol A. The symbol appears on the
front panel and is an international symbol meaning “refer
to the Operating and Service Manual”. This symboi flags
important operating instructions located in Section II],
To ensure the safety of the operating and maintenance
personnel and retain the operating condition of the
instrument, these instructions must be adhered to.
Section I
Model 3438A
Specifications.
Table 1-1.
DE VOLTMETER
Ranges Max Display
+ 200 my + 199.9 mV
+ 2 Vv + 1989 yv
+ 20 VW + 19.99 V
+200 V i 13999 V
+ 1200 V + 1199 \
Maximum Input! 1200 V {de + peak acl.
Ranging: Automatic or manual.
Sensitivity: 100 4 Y on 200 mV range,
Polarity: Automatically sensed and displayed,
Accuracy: 1 Year 15° to 30°C © 95% RH,
Range Specifications
200 mV + (0.1% of reading + 2 digits)
2 V to 1206 V + 10,1% of reading + 1 digit)
Temperature Coeffibient: 07 - 15°C and 30 -55C
£ [018% reading + 0.1 digit? / C
Input Resistance: 10 meg DD + 1%.
Input Type: Floating 500 V max COM to ground,
Normal Mode Rejection: 40 dB at 50 Hz and 60 Hz
+ À Hz.
Effective Common Mode Rejection: With + ke
unbalance is > 1720 de at 50/60 Hz + 0.1%.
Response Time: < 0.7 seconds to within 1 digit of final
value on any range, Add * second for each range
change.
AC VOLTMETER
AC Converter: Avg. Responding rms calibrated.
Ranges Max Display
200 mV 198.8 mV
2 \ 1.995 У
20 Y 1999 V
200 Y 1998 V
17200 V 1198 V
Maximum Input: 1700 V (de + peak act, 107 volt -
Hz max,
Ranging: Automatic or manual,
Sensitivity: 108 uV on 200 m'V range.
Accuracy: 1 year, 15° to 30°C @ 95% RH,
Minimum Reading: 20 digits.
30 Hz - 50 Hz + {15% of reading + 3 digits}
50 Hz - 20 kHz + {0.3% of reading * 3 digits}
20 kHz - 100 kHz + {1.5% of reading + 10 digits}
Temperature Coefficient: 0°. 15°C and 30° 55°C
+ {0.04% of reading + 0.2 digits} / €.
input Impedance: Resistance: D meg 2.
Shunt Capscitance: < 50 рЁ.
Input Type: Floating 800 V max COM to ground.
Response Time: 1.0 seconds to within 3 digits of final
valug on any range. Add 1.2 seconds for each
range change.
DC AMMETER
Ranges Max Display
+ 200 HA + 199 9 нА
+ 2 mA + 1.900 mA
+ 20 mA + 19.99 mA
+ 200 mA + 199.0 mA
+ 2000 mA + 1999 mA
Maximum Input: ZA from < 250 Y source.
Protection: 2A/250 V fuse (normal biow/.
Ranging: Manual only.
Sensitivity: 100 nA on 200 yA range,
Polarity: Automatically sensed and displayed, .
Accuracy: 1 year, 16 to 30°C ® 95% RH.
Range Specifications
200 A to 200 mA +
2000 mA +
(0.3% of reading + 2 digits)
{0.6% of reading + 2 digits)
Temperature Coefficient: O - 15°C and 30 - 55°C
+ {028% of reading + 0,1 digits) / С.
Voitage Burden:
Max Burden
Range at Fuli Scale
200 pA to 20 má < 220 mV
200 mA < 240 mV
2008 mA < 400 mV
Input Type: Floating BOO V max COM to ground.
Response Time: 0,7 seconds on any range to within
1 digit of final value,
AC AMMETER
Ranges Max Display
200 LA 199,9 HA
2 MA 1.399 mA
20 mA 19.29 mA
200 mA 193.9 mA
2000 mA 1988 mA
Maximum input: 2A from < 250 V source.
Protection: ZA/250 Y fuse (normal blow,
Ranging: Manual only,
Sensitivity: 100 nA on 200 нА range,
Accuracy: With display of 720 digits.
1 year 1510 30 C 95% RH,
Model 3438A Section !
Tabie 1-1. Specifications (Cont'd).
OHMMETER
ficati
4 Specifications Ranges Max Display
«< + {2% of x {1.2% of reading
es reading + 4 digits) 20 8 19.99 2
2 200 £ 1999 a
q) o 2 ke 1.399 ko
2 £4 digits) 20 к? 19.99 kQ
i | 200 ко 1999 ka
= 3 2006 k& 1999 ко
E x {1.7% of
3 - < reading 20 MQ 19.939M0
28 + 4 digits) + (0.9% of reading input Protection: 250 V rms,
2 + 4 digits)
| Ranging: Automatic, or manual.
Sensitivity: 10 milllohm on 20 © range.
Hz 50H TO kH
ЗО Не © ne Accuracy: 1 year 15 to 30°C at 95% RH.
Frequency of Input Signal
Range Specification
202 + {0,5% of reading + 10 digits}
Temperature Coefficient: 0 - 15°C and 30 - 55°C
+ (0.05% of reading + 0.2 digits) / C.
Voltage Burden:
200 uA to 20 mA
200 mA range
< 220 mV rms
< 240 mV rms
200 & to 2 MQ + {0.2% of reading + 2 digits}
20 MO
Temperature Coefficient: O - 15°C and 30 - 55°C.
+ {3 8% of reading + 2 digits)
Range
Specifications
2000 mA range
input Type: Floating 500 V max COM to ground,
Response Time: 1.6 seconds on any range to within
3 digits of final value
< 430 mY rms
20 5 to 2MO
20 MO
Configuration: 2 wire,
Open Circuit Voltage: < 5 Y max,
Current through unknown:
+ 10.04% of reading + 0.2 digits] fe
+ (.18% of reading + 0.2 digits) /°C
Range
2082 20082
2k£2
20k 200k : 2MS2 | Z0M£2
Current
SmAIDMmA
SO0UA
Response Time: 0,8 seconds to within 1 digit of final
value. Add 0.8 seconds for each range change,
in accordance with 1EEE..488—1975, the 3438A Multimeter
meets the following Interface Function Specifications,
SOLA | SHA SO00NA ¡S0nA
Interface
Function Description 3438 A Capability
SH Source handshake Yes
АН? Acceptor handshake Yes
T7 Talker {basic talker, talk only mode,
unaddress-to-talk if addressed-to- Yes
listen
La Listener (basic listener, Unaddress- Yes
to-listen if addressed-to-talk}
El Open collector Bus driver Yes
BEN Device trigger Yes
RL? Remote/Local Yes
LLO Local iock-out Mo
SRO Service Request No
PPO Parallel poll No
DCO Device clear No
со Controller No
1-3
Section I
Table 1-2.
Model 3438A
General Information.
GENERAL:
Display: 7 segment RED 0.3 inch high LED's.
Function and range annunciation.
Reading rate: 2.4 - 4.7/sec. depending on input level,
A-D Conversion: Dual siope,
integration time: 100 msec.
Ranging: Automatic or manual in ac V, de V and ohms,
Manual only in ac and de current,
Storage Temperature: (40 to +78)%;
Operating Temperature: (0 to 56} °C,
Humidity: 0-95% RH at 40°C.
Power: AC line: 48 - 440 Hz 86-106 YV Opt. 100
104-127 V Opt 115
190-233 V Ont. 210
208-250 V Opt. 230
Total Instrument Power Dissipated: 12 watts
Configuration: 3438A Std, Rack and Stack case, ac
tine power only, Rack mount kit not included.
Dimensions: 20.96 cm (8 1/47} wide x 8.57 cm
(3 3/87) high x 31,12 em {12 1/4 in.)
Weight: 2.87 ka (6 ths. Boz.)
1-4
Table 1-3. Options.
Standard Rack mount case. AC line operation only.
Option 100 86-106 Мес 48-440 MHz 12 Watts
Option 115 104-127 Vac 48-440 Hz 12 Watts
Option 216 190-233 Vac 48-440 Hz 12 Watts
Option 230 208 - 250 Мас 48-440 Hz 12 Watts
Option 908 Rack Mount Kit . -hp- Part Number 5061-0054.
Option 919 An additional Operating and Service Manual,
Table 1-4. Accessories.
110024 Test leads {dual banana to dual alligator).
11003A Test leads dual banana to probe and alligator.
110958 RE Probe 10 kHz to 700 MHz, use only 10 V and
100 Y de ranges.
5061-0054 Rack adapter kit including % module filler panel,
34110A Soft vinyl carrying/operating case.
B4111A kigh voltage probe, 40 kV de
341724 Touch - Hold, input probe,
11067A Test lead kit.
11000 A Test leads, dual banana on both ends
10631 А TM (39.377) HP-16 Cables
10631B 2M (78,747) HP—IB Cables
1086310 4M (157.487) HP—1B Cabies
pario
Model 3438A Section I!
SECTION II
INSTALLATION
2-1. INTRODUCTION. 2-11, HEWLETT—PACKARD
2-2. This section.contains information and instructions
for the installation and shipping of the Multimeter.
Included are initial inspection procedures, power and
grounding requirements, environmental information,
and instructions for repackaging the instrument for
shipment.
2-3. INITIAL INSPECTION.
2-4. This instrument was carefully inspected both
mechanically and electrically before shipment. It should
he free of mars or scratches and in perfect electrical order
upon receipt. To confirm this, the instrument should be
inspected for physical damage in transit. Electrical
performance should be tested using the performance test
outlined in Section V. If there is damage or deficiency, see
the warranty insde the front of this manual.
2-5. POWER REQUIREMENTS.
2-6. The Multimeter can be operated irom any one of
the ac power sources listed in Table 1-2. Before
connecting the instrument to ac power, verify that the ac
power source matches the power requirement of the
instrument as marked on the option label affixed to the
rear of the instrument. If the instrument is incompatible
with the available power source, refer to Section V for
Power Requirement Modification instructions.
2-7. ENVIRONMENTAL REQUIREMENTS.
2-8. The Multimeter will meet the specifications listed
in Table [-] when the operating temperature is within the
range of + 15°C to + 30°C. The instrument can be
operated where the ambient temperature is within the
range of 0°C to + 40°C and the relative humidity 1s less
than 95%.
WARNING |
To prevent potential electrical or fire hazard,
do not expose equipment io rain or moisture.
2-9. INSTRUMENT MOUNTING.
2-10. The Multimeter is shipped with plastic feet and
tilt stand in place, ready for use as a bench instrument.
The front of the instrument may be elevated for
convenience of operating and viewing by extending the
tilt stand. The plastic feet are shaped to permit placing the
instrument on top of other System II half or full module
Hewlett-Packard instruments.
INTERFACE
BUS (HP—IB).
2-12. Figure 2-1 illustrates the rear panel HP—IB
connector, along with a brief description of each signal
line.
2-13. Interface Cable Length.
2-14. The maximum accumulative length ofan HP——IB
cable in any system must not exceed more than 2 meters
of cable per device (up to 15 devices) or 20 meters,
whichever is less.
2-15. REPACKAGING FOR SHIPMENT.
2-16. The following paragraphs contain a general guide
for repackaging the instrument for shipment. Refer to
Paragraph 2-17if the original container is to be used, 2-18
if it is not. If vou have any questions, contact your nearest
-hp- Sales and Service Office, (See Appendix À for office
locations.)
NOTE
If the instrument is to be shipped to Hewlett-
Packard for service or repair, attach a tag to
the instrument identifying the owner and
indicating the service or repair to be
accomplished. Include the model number and
full serial number of the instrument. In any
correspondence, identify the instrument by
model number and full serial number.
2-17. Place instrument in original container with
appropriate packing material and seal well with strong
tape or metal bands. If original container is not available,
one can be purchased from your nearest -hp- Sales and
Service Office.
2-18. If original container is not to be used, proceed as
follows:
a, Wrap instrument in heavy paper or plastic
before placing in an inner container.
b. Place packing material around all sides of
instrument and protect front panel with cardboard strips.
¢. Place instrument and inner container in a heavy
carton or wooden box and seal well with strong tape or
metal bands,
2-1
Section H
Mode] 3438 A
HP-IB CONNECTOR J701
CHASSIS/OUTGUARD
one GROUND
ооо A
ao ant \ Mating Connector:
г
: НН \ 3
HHH HHH)
-hp- Part No. 1252-06293
Amphenoi No, 3730240
Mating Cables:
à
DIOL
DiQ2
DIOS
LOS
EOI
DAV
NRFO
NDAC
IFC
DIO 1-8 {Data Input/Output}
Mnemonic referring to the eight "Data Input/Output’
lines. The DIC fines transfer messages in a byte-seriai,
bit parallel manner.
EO {End or identify}
Mnemonic referring to the “End or Identify” control
tine, ECI is used by a device to indicate the end of a
multiple-byte transfer.
DAY (Data Valid}
Mnemonic referring to the “Data Valid” control line,
DAY is used to coordinate the “handshake” sequence.
The DAV line is controlled by the source {talker}. When
DAY is true, data on the DIO lines is considered valid,
MRE {Not Ready For Data}
Mnemonic referring to the "Ready For Data’ control
line. NARFD is used to coordinate the “handshake”
sequence. The NRFD line is controlled by the acceptor
Histener), When NRFD is true, the acceptor indicates to
the source that he is ready to accept data.
NDAC {Data Not Accepted)
Mnemonic referring to the “Data Accepted” contro: line.
NDAC is used to coordinate the “handshake” sequence.
The NDAC line is controlled by the acceptor {listener).
When NDAC is true, the acceptor indicates to the source
that the data on the DIO lines has been accepted.
Articles”
SRG
ATN
SHIELD
For further information concerning the HP-IB,
"Hewlett-Packard interface, A Compendium of Technical
-hp- publications No, 5957-2472.
À 10631 A 3 tt.
106318 6 ft,
SEE 4560 106310 12 ft,
the source that the data on the DIO
accepted.
lines has been
{FC {interface Clear}
Mnemonic referring to the “Interface Clear” control line.
IFC is used to place the HP-1B system In a known quies-
cent state. The IFC line is controlled by the system
controtier.
SRO (Service Request! Not Available in 34384
Mnemonic referring to the “Service Request” control
line. SRO is used (by any device having service request
capability to indicate to the system controller that the
device requires service, The controller responds by polling
the devices ta determine which device requested service.
ATN (Attention)
Mremonic referring to the “Attention” contro! line, The
state of the ATN line determines whether the HP-IB isin
the “Command mode” (ATN truel or the “Data mode”
{ATHN false}, When ATN is true, all devices must listen to
the data Hnes, and when ATN is false, only devices that
have been addressed will actively transfer data.
REN (Remote Enable?
Mnemonic referring to the "Remote Enable” control
Hine, REN is used in conjunction with listen addresses
{DIO 1-8) to select either focal or remote control of each
device,
refer to
Figure 2-1.
2-19. POWER CORDS AND RECEPTACLES.
2-20. Figure 2-2 illustrates the plug cap configurations
that are available to provide ac power to the Multimeter.
The -hp- part number shown directly below each plug cap
drawing 1s the part number for the power cord set
equipped with the appropriate mating plug for that
receptacle, The appropriate power cord should be
provided with each instrument. However, 1f a different
power cord set is required, notify the nearest -hp- Sales
and Service Office and a replacement cord will be
provided. The instrument ac power input receptacle and
cord set appliance coupler meet the safety specifications
set by the International Commission on Rules for the
Approval of Electrical Equipment (CEE 22),
2-2
Mewliett-Packard
Interface Bus Connector.
О-ва
*UL LISTED FOR USE IN THE UNITED STATES OF AMERICA
Figure 2-2. Power Receptacles.
Model 3438A
Section HI
SECTION ¡il
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.
3-2. This section contains instructions for operating the
Multimeter. Measurements of ac and de voltage, ac and
de current, and ohms are discussed. Sample applications
will be given in this section to demonstrate the use of the
HP-IB. A description of the controls and connectors 15
given in Figure 3-3.
To prevent potential electrical or fire hazard,
do not expose the Multimeter or its
accessories to rain or moisture.
3-3. AC Operation.
3-4, Before connecting the Multimeter to ac power,
verify that the ac power source matches the power
requirements the Multimeter as marked on the option
label affixed to the rear of the instrument. If the
instrument is incompatible with the available power
source, refer to Section V of this manual for power
requirement modification instructions. After this
verification, connect the proper ac power to the
instrument and press the ON button. The instrument 1s
ready for use.
3-5. Overload/Overrange/Improper Function
indication.
3-6. Figure 3-1 shows the display indication during
overload, overrange, or an improper switch setting.
O|L
Figure 3-1. Overload Indication.
3-7. Table 3-1 lists improper switch combinations.
Table 3-1. improper Switch Combinations.
Function Range
Y is
20
NV mv, | MG
20 20
MA mV, | MI: Auto
20 20
> MÁ mV, $7 | MO | Auto
20 20
3-8. Auto.
3-9. Depressing the AUTO switch with acV, deV or k O
function selected sets the Multimeter 1n an automatic
ranging mode. In this mode the Multimeter will uprange
¡f the display increases above (+) or (-) and
downrange if the display decreases below (+) or (-)
СТВ. These numerical autoranging points are
irrespective of decimal placement. The difference
between the two autoranging points is called auforanging
de voltage measurements from © 10 1200 У de,
Autoranging in other Multimeter functions 1s similar,
> > >
© o Q =
= æ <
ss [] æ o
+ er ann —
E T F F
1 E 5 5 Ё
: i : ;
2008 ! Ë ; £ 4
! i 1 !
200 !
= ‘ # № *
= i ; i
x 2 | ++ Le +
= #'@ ых
i
a? vi
> > > > > =
e E Ti m Ti 5%
S 3 2 8 3 FE
q 5 a J D SE
o Hr
&
INPUT LEVEL (Yde) nm
# = DOWNRANGE POINT %: UPRANGE POINT
Figure 3-2. Multimeter Autoranging.
3-10. To release the AUTO switch depress one of the
MANUAL RANGE switches,
3-11. Input Terminals.
3-12. Input Selector Switch. The Input Selector
Switch (front panel) is used to select front or rear input
terminals. Inthe FRONT position, the V{), COM, and A
input terminals are internally connected to enable the
user to make voltage, current, and resistance
measurements from the front panel. With the Input
Selector switch set to REAR, the V {) and COM input
terminals on the rear panel are connected to allow the
user to make voltage and resistance measurements.
NOTE
There is no current measuring capability from
the rear input terminals.
3-1
Section HI
Model 3438A
©
090890999000 OOOO
®
Ft
©
©
©
©
DESCRIPTION
POWER ON/OFF SWITCH. SWITCHES MULTIMETER
POWER ON OR OFF.
FUNCTION SWITCHES: USED TO SELECT THE FIVE
MULTIMETER FUNCTIONS,
DC VOLTAGE FUNCTION SWITCH.
AC VOLTAGE FUNCTION SWITCH.
DE MILLIAMPERES FUNCTION SWITCH.
AC MILLIAMPERES FUNCTION SWITCH.
KILOMMS FUNCTION SWITCH
MANUAL RANGE SWITCHES: USED TO SELECT INPUT
MEASUREMENT RANGES.
20 OHMS RANGE SWITCH (OHMS ONLY),
200 MILLIVOLT, MICROAMP AND OHMS RANGE SWITCH.
2 VOLT, MILLIAMP AND KILOHM RANGE SWITCH.
20 VOLT, MILLIAMP AND KILOHM RANGE SWITCH.
200 VOLT, MILLIAMP AND KILOHM RANGE SWITCH.
1260 VOLT, 2000 MILLIAMP AND KILOHM RANGE SWITCH.
20 MEGOHM RANGE SWITCH {OHMS ONLY}
AUTO RANGE SWITCH. AUTOMATICALLY SELECTS
RANGE FOR BEST RESOLUTION WHEN AC VOLTS, BC
VOLTS, OR OHMS FUNCTIONS ARE SELECTED.
INPUT TERMINALS,
AMPS INPUT TERMINAL: USED IN CONJUNCTION WITH
THE COM TERMINAL FOR MEASURING AC AND DC
CURRENT. ALSO USED FOR READING HOLD INPUT,
@
еее ©
OO e)
00 ©
"I aa
Tu
Py MAS wok à
its tr MAITE
COM INPUT TERMINAL: COMMON TERMINAL FOR
AC/DC VOLTS, AC/DC AMPS AND OHMS MEASURE-
MENTS.
VOLTS] OHMS INPUT TERMINAL: USED INCONIUNCTION
WITH THE COM TERMINAL FOR MEASURING AC/DC
VOLTAGE AND OHMS,
HP-—IB STATUS ANNENCIATORS.
FUNCTION/ RANGE ANNUNCIATORS.
DISPLAY: FOUR SECTION LED READOUT, LEFT SECTION
DISPLAYS +/+ L RIGHT THREESECTIONS ARE7SEGMENT.
INPUT SELECTOR SWITCH: IN THE REAR POSITION, THE
VO'AND COM INPUTS ARE SWITCHED TO THE REAR
PANEL AND THE FRONT PANEL INPUT TERMINALS ARE
OPEN. IN THE FRONT POSITION, THE REAR PANEL INPUT
TERMINALS ARE OPEN. REAR TERMINALS CANNOT BE
USED FOR CURRENT MEASUREMENTS,
‘AC POWER RECEPTACLE,
HP —IB CONNECTOR,
AC POWER INPUT FUSE.
POWER SUPPLY TRANSFORMER.
COM INPUT TERMINAL. SAME AS EXCEPT NG
CURRENT MEASUREMENTS WHEN USING REAR TERME
NALS.
VO INPUT TERMINAL, SAME AS an WHEN USING REAR
TERMINALS,
POWER LINE GROUND TERMINAL,
SERIAL NUMBER, LINE VOLTAGE LABEL
3-2
Figure 3-3. Front and Rear Panel Descriptions,
Model 3438A
{
ECAUTION?
To avoid possible damage to the Multimeter,
de not change the position of the Input
Selector switch while voltage is connected to
the front or rear input terminals.
3-13. VQ (Volts /Ohms). The V{ terminal (front or
rear panel} is the high terminal for ac and de voltage
measurements. For ohms measurements, 1t is the positive
(+) terminal.
3-14, COM (Common). The COM terminal is used for
all five Multimeter functions. It is the negative (-)
terminal for ohms measurements and it is the low
terminal for ac and dc voltage and current measurements.
The rear panel COM terminalis only used for voltage and
resistance measurements.
ECAUTION:
To avoid possible damage to the Multimeter
circuitry, the voltage between COM and
(earth ground) must not exceed plus or minus
500 V de.
3-15. A (Amps). The A terminalis the high terminal for
ac and dc amps measurements. There 1s a 2 amp input
protection fuse in series with this terminal.
A CAUTIONS
The current function is protected by a fuse of
250 Y rating. To avoid damage to the
Multimeter, current sources having open
circuit voltages greater than 250 V (de + peak
ac) must not be connected to the A famps)
input terminal.
3-16. DC Voltage Measurements (Front or Rear
input Terminals).
To avoid possible damage to the Multimeter
circuitry, the de input voltage must not exceed
1200 V {de + peak ac).
3-17, Procedure.
a. Depress === Y (de volts).
b. Depress proper manual range (200 mV to 1200 V)
or depress AUTO for automatic range selection,
с. Connect test leads from the Multimeter V.{) (high)
and COM (low) terminals to the voltage under test as
shown in Figure 3-4,
Section IT
BATTERY
Figure 3-4. DC МоНаде Measurements.
3-18. AC Voltage Measuremenis (Front or
Rear input Terminals).
To avoid possible damage to the Multimeter
circuitry, the ac input voltage must not exceed
1700 Y (de + peak ac).
3-19. Procedure.
a. Depress ~ V {ac volts).
bh. Depress proper manual range (200 mV to 1200 Y)
or depress AUTO for automatic range selection.
с. Connect test leads from the Multimeter V.Q (high)
and COM (low) terminals to the voltage under test as
shown in Figure 3-5,
Fa
AC VOLTASE
SOURCE
2A FUSE
Figure 3-5. AC Voltage Measurement.
3-3
Section IH
3-20. DC Current Measurements,
CCAUTION
The current function is protected by a fuse of
250 Y rating. To avoid damage to the
Multimeter, current sources having open
circuit voltages greater than 250 Y (dc + peak
ac) must not be connected to the A (amps)
input terminal.
3-21. Procedure:
a. Depress w= mA (dc milliamperes).
b. Depress proper manual range (200. uA to 2000 mA).
ce. Connect test leads from the Multimeter À and
COM terminals in series with the current under test as
shown in Figure 3-6.
Model 3438A
3.22. AC Current Measurements.
СООО
The current function is protected by a fuse of
230 V rating. To avoid damage to the
Multimeter, current sources having open
circuit voltages greater than 250 V (de + peak
ac) must not be connected to the A (amps)
input terminal.
3-23. Procedure:
a. Depress ~ mA (ac milliamperes).
b. Depress proper manual range (2004 to 2000 mA).
¢. Connect test leads from the Multimeter A and
COM terminals 1n series with the current under test as
shown in Figure 3-7,
=>
Л
34664 -+ 5- FO
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CURRENT
DC
+
SOURCE
Figure 3-6. DC Current Measurements.
то
АС
CURRENT A
SOURCE
Figure 3-7. AC Current Measurements.
3-4
Model 3438A
3-24. Resistance Measurements (Frontor Rear
input Terminals).
3-25, Procedure:
a. Depress k À (kilohms).
b. Depress proper manual range or Auto for
automatic range selection (20 {) to 20 MO).
c. Connect test leads from the Multimeter Y 4) and
COM {-) terminals to the resistance under test as shown
in Figure 3-8.
NOTE
When making resistance measurements using
the lower ohms ranges, consideration should
be given to the resistance of the test leads. This
potential measurement error can be elimi-
nated by measuring the lead resistance and
subtracting it from the combined resistance
value of the test leads and the resistance under
test,
e
>
2A FUSE
Figure 3-8, Resistance Measurement.
3-26. HP—IB APPLICATIONS.
3-27. Examples of typical HP—IB System operations
using the 3438A Multimeter are given to aid the user in
setting up his own system. There are two usable HP—IB
modes of operation:
a. Talk Oniy.
b. Addressed To Talk.
Both modes will be discussed in the following
paragraphs.
Section 1Н
3-28. Daia Output Format.
3-29. The Data Output Format and Function Codes are
shown in Figure 3-9.
-DDDD ED 3 F ER LEO
ra Te arb, ties mes me moe эт
Display Exponent Delimiter Function Carriage Line
а аще Code Return Feed
input
Value Function : Code
Figure 3-9, Data Output Format and Function
Codes.
3-30, The Data Output Format 1s a fixed length of 13
characters. The Display and Exponent portion combine
to relate the actual input value.
Exampie:
If the Muitimeter display reading was + 17,90 Y in the
de Y function, the output format would be:
+ 1.790 E + 1, >
SN Function Code
Input Value
NOTE
There is no leading zero suppression.
3-31, Overlcad Indication. The output format for an
Overload Indication is:
1.DDD E +9, F, CR, LF.
—Tl
Random
Numbers
Overload Indication
The leading | and the + 9 exponent signifies an overload
indication,
3-32. Taik Only Mode.
3-33, The Talk Only Mode is used in an HP-IB system
without a controlier. The Address Switches AS6 and
AS7, which are located on the A3 Logic board (remove
top cover), must be set as shown in Figure 3-10 for this
mode. AS! through ASS may be set in any position.
3-5
Section Hi
ADDRESS
SWITCHES
ADDRESSABLE TALK ONLY AST
OPERATE TEST ASH
о | |] ASS
O E ABA
O | ADDRESS ASS
Q 1 ASE
O | J AS]
V SWITCHES MAY BE
SET IN ANY POSITION
FRONT Z430A- 8-5
Figure 3-10, Taik Oniy Switch Settings.
3-34, In the Talk Only mode with no other devices
connected to the Multimeter, the Multimeter inputs are
sampled continuously at a rate of 2.4—4.7/sec
determined by the exact input level. Data is output at the
HP—IB terminal as fast as it is obtained, Refer to Table
3-2.
Table 3-2. Output Delays.
Bus Commands Time Required
Group Execute Trigger (GET! < 1 msec
Dual Slope Conversion = 300 msec
Multimeter Qutput Availability =. 9 msec
GET thru Qutput Availability ® < 310 ms
Time te Output Data to the HP—IB |< 800 us + Listener delay
Time to Accept Data from the HP..TB ! SIG us/character:
100 us/character typical
*Atter 100 ms Auto Zero
3-35. With other devices connected to the Multimeter via
the HP—IB, the output data rate is determined by the
slowest Listener. The following application shows a
simple data logging system using the -hp- Model 3438A
Multimeter and ihe -hp- Model 5150A Thermal Printer.
Model 3438A
3-36, Procedure:
a. With both instruments OFF, connect the HP—IB:
cable between them.
b. Set Printer to LISTENING (back panel).
c. Set Printer PRINT COMMAND switchto LF (line
feed).
d. Set the Printer front panel to the desired Print
interval.
NOTE
If the selected print interval is less than the
Multimeter output rate, the actual print
interval will be equal to the Multimeter
sample period.
e. Set the PRINT TIME switch to Sep Line (separate
line).
f. Set the Multimeter Address Switch to Talk
Only/ Operate as shown in Figure 3-10.
g. Select the desired Multimeter Function and Range
and connect the Multimeter to the unknown voltage,
current, or resistance,
В, Switch both instruments ON and set the printer
clock time (front panel), The Multimeter TALK
annunciator light should be ON.
3-37. This system will print the Multimeter data and the
Printer clock time, Any HP—IB compatible LISTENER
can be used in place of the -hp- Model 5150A Printer for
this system.
3-38, L Option 003 is installed in the 5150A Printer, as
many as thirteen 3438A Multimeters can be scanned on
one НР---1В data logger system.
3-39. Addressable to Talk Mode.
3-40. The Addressable to Talk Mode is used in a system
with a controller such as a calculator or computer.
THERMAL PRINTER
hp SISOA
HP-IB CABLE
MULTIMETER
hp 3438A
a Lg
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| OPTION 00} &
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Figure 3-11. Talk Only Data Logger.
3-6
Model 3438A
3.41. The Talk Address is user selectable by the
internal Address switches Asl through ASS. The
Multimeteris shipped with address select code 23 as
shown in Figure 3-12, This switch is binary coded,
ie, ASS has weighting of 2° = 16, AS4 has
weighting of 2 * = 8, etc.
ADDRESS
SWITCHES
ADDRESSABLE TALK ONLY AST
OPERATE TEST AS6
О | (16) ] ASS (MSD)
O | (8) AS4
| (4) > ADDRESS AS3
1 (2) ÂS2
i 4} J ASÍ (LSD)
FRONT 3438A—8—5
FOI, = 25
Figure 3-12. Address Select Code.
3-42. Sample Applications using three different -hp-
calculators (9815A, 9825A, and 9830A) will be shown in
the following examples. In each of these examples, the
Multimeter is set to the Addressable to Talk Mode.
3-43. -hp- 9815A Sample Application.
(See Figure 3-13. 9815A/HPIB
Application.)
3-44. -hp- 9825 Sample Application.
(See Figure 3-14. 9825/HP-IB
Application.)
Section HI
3-45. -hp- 9830 Sample Application.
(See Figure 3-15. 9830A/HP-1B
Application.) |
3-46. Option Decal.
3-47. the option decal 1s affixed to the rear of the
Muitimeter. An example is shown in Figure 3-16.
rr LINE A mene SER. APTA
56.106 m 104.127 V MADE IN U.S.A.
TOO SSIAN [208 280 V HP 3438A MULTIMETER
Figure 3-16. Option Decal.
3-48. Amps input Fuse Replacement,
3-49, The amps input is protected by a 2A 250 V normal
blow fuse, -hp- Part Number 2110-0002. This fuse is
easily replaced using the foliowing procedure:
a, Insert a coin or wide bladed screwdriver into the
slots of the A input terminal.
b. Press the color ring in and rotate it counterclock-
wise 1/3 turn.
¢. Remove and replace the blown fuse.
3-50. Multimeter Cleaning.
1
ÉCAUTION
Do not allow cleaning solvents, flux remover,
or alcohol to come in contact with the
Multimeter,
3-51. The Multimeter case and front panel should only
be cleaned with a mild solution of soap and water and a
soft cloth.
3-7
Section (Ш
Model 3438A
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hp 38154
1063IA/8/C HP-IB CABLE |
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3438A-B-2
MULTIMETER
hp 3438A
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Figure 3-13. 9815A/HP—IB Application.
9815A PROGRAM #1
9815A PROGRAM #1 PRINTOUT
ENTER
3438A ADDRESS
GO TO
REMOTE
(REN)
PAUSE
3438A
ADDRESS
TRIGGER
3438A {GET)
INPUT AND
PRINT 3438A
DATA
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3-9
Section Lil
Model 3438A
CALCULATOR
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INTERFACE
hp 98034 A
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*MUST HAVE 98214À AND (982104 ROMs INSTALLED.
MULTIMETER
hp 3438A
| o
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9825A PROGRAM #1]
Figure 3-14. 9825/HP—IB Application.
9825A PROGRAM #1 PRINTOUT
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> Model 3438A Section HI
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Section II
Model 3438A
LINE PRINTER
hp 9866A
… 10651A/B/C_HP-IB CABLE
MULTIMETER
hp 3438A
INTERFACE
FIA
hp 59405A
CALCULATOR
hp 9830A
=
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Figure 3-15. 9830A/HP-—IB Applications.
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