YOKOGAWA 734 01 User manual

IM 73401
4th Edition
July. 2001
Store this manual in a safe place for future reference.
734 01/02
Digital Multimeter
User's
Manual

i
Thank you for purchasing our Model 734 Digital Multimeter.
This user’s manual describes the specifications and handling precaution for
this Digital Multimeter.
Before using this Digital Multimeter, thoroughly read this manual to get a
clear understanding on proper use.
Always observe the following instructions.
Failure to do so may result in electric shock or other dangers that may lead to
serious injury or the loss of life.
Yokogawa M&C Corporation is in no way liable for any damage resulting
from the user’s mishandling of the product.
For safe use of this product, the following safety symbols are used on the
product:
■About This Manual
•Every effort has been made to ensure accuracy in the preparation of this
manual.
However, should any errors or omissions come to the attention of the user,
please contact Yokogawa M&C Corporation.
•The contents of this manual are subject to change without prior notice
because of improvement in performance or function.
•All rights reserved. No part of this manual may be reproduced in any from
without Yokogawa M&C Corporation’s written permission.

ii
Regarding Safe Use of This Product
For safe use of this product, the following safety symbols are used on the
product:
WARNING
This indicates that the operator must refer to an explanation
intheinstructionmanualinordertoavoidtheriskofserious
injury or the loss of life.
CAUTION
This indicates that the operator must refer to an explanation
in the instruction manual in order to avoid the risk of injury
or damage to the product.
Note This indicates information that is essential for handling the
instrument or should be noted in order to familiarize
yourself with the instrument’s operating procedures and/
or functions.
Danger! Handle with Care
This symbol indicates that the operator must refer to an
explanation in the instruction manual in order to avoid risk
of injury or death of personnel or damage to the instrument.
Double Insulation
This symbol indicates double insulation.
Direct Current
This symbol indicates DC voltage/current.
Alternating Current
This symbol indicates AC voltage/current.
DC/AC
This symbol indicates AC and DC.
Fuse
This symbol indicates a fuse.
Ground
This symbol indicates ground (earth).

iii
WARNING
■Always observe the following instructions. Failure to do so
may result in electric shock or other dangers that may lead to
serious injury or the loss of life.
Testing leads
•Use the probes supplied by Yokogawa M&C with this instrument.
•Do not use testing leads that have deteriorated or are defective.
•Disconnect testing leads from the circuit under test before opening the
casing to replace the batteries or for any other reason.
•Disconnect testing leads from the circuit under test before attaching/
detaching the testing leads to/from the instrument.
•Disconnect testing leads from the instrument before opening the casing to
replace the batteries or for any other reason.
Casing
•Do not use the instrument if there is any damage to the casing or when the
casing is removed.
Fuses
•Use fuses of the specified rating when the fuse is replaced.
Operating Environment
•Do not operate the instrument in an atmosphere where any flammable or
explosive gas is present.
•Avoid using the instrument if it has been exposed to rain or moisture or if
your hands are wet.
Disassembly
•No person, except personnel from Yokogawa M&C, is authorized to
disassemble this instrument.

iv
WARNING
■To avoid damage to instrument and/or electric shock
The restrictions on the maximum voltage level for which the 734 01 and
734 02 can be used, depend on the over-voltage categories specified by
the safety standards. These category specifications are set to protect
operators against transient impulse voltages and surge voltages in power
line.
Do not apply any input level higher than maximum allowable input.
AC/DC 600V CAT.III
AC/DC 1000V CAT.II
䊉Over-voltage Category (Safety standards EN61010-1)
CAT.III: Covers the path from an indoor distribution switchboard to a
mains outlet.
CAT. II: Covers a primary-stage circuit of equipment connected to a
mains outlet.
CAT. I : Covers a secondary-stage circuit of power transformer of
equipment.
Note
Radiation immunity affects the accuracy of the 734 01 and 734 02 under
the conditions specified in EN5008-1 and EN61326-1.
Use of this instrument is limited to domestic, commercial, and light
industry applications. If equipment generating strong electromag-
netic interference is located nearly, the instrument may malfunction.

v
Contents
1. Overview ................................................................................................ 1
2. Specifications ......................................................................................... 3
2-1 General Specifications.................................................................. 3
2-2 Measurement Ranges ................................................................... 6
3. Operation .............................................................................................. 14
3-1 Precautions Before Measurement............................................... 14
3-2 Components................................................................................ 15
3-3 Measuring Instruction ................................................................ 20
4. Battery and Fuse Replacement ............................................................. 42
4-1 Battery Replacement .................................................................. 42
4-2 Fuse Replacement ...................................................................... 43
5. Calibration and Maintenance................................................................ 44

1
1. Overview
䊉Fast and more accurate measurement
The 734 01 and 734 02 digital multimeters use Σmodulation for
A/D conversion, which enable fast and more accurate measurement.
䊉Display
5-digit (LCD)
Maximum Reading: 50000
Bar graph indicator
䊉Supports a variety of measurement function
DCVoltage,ACVoltage,DCCurrent,ACCurrent,Resistance,Frequency,
Temperature, Capacitor,
Duty cycle ratio, Decibel (dB), Averaging when the measured value may
greatly fluctuate,
Relative values from the reference measurement values (REL ),
Minimum value (MIN), Maximum value (MAX), Average value (AVG),
RangeHold(R•H),Data Hold (D•H), Auto Hold (A•H), Peak Hold* (P•H),
Continuity Check, Zero Adjustment (Capacitor, Resistance), Diode Test,
Save to Memory, LCD backlight*, *: For model 734 02 only
䊉Communication: Optional communication unit is required
•Enables downloading of measurement data to a personal computer
using optional communication package.
Uploading of data, making trend graph and downloading to EXCEL
are possible according to applications.
•Output of measurement data to the optional printer is possible.

2
䊉Safety design
Complied standards: CE standards
Uses a current-input terminal shutter for preventing wrong input.
Uses high-performance UL-standard fuses.

3
2. Specifications
2-1 General Specifications
Function: DC Voltage, AC Voltage, DC Current, AC Current,
Resistance, Frequency, Temperature, Capacitor,
Dutycycle ratio, Decibel (dB), Averaging functuon,
Relative values from the reference measurement
values(REL ), Minimum value (MIN), Maximum
value (MAX), Average value (AVG), Range Hold
(R•H), Data Hold (D•H), Auto Hold (A•H), Peak
Hold* (P•H), Continuity Check, Zero Adjustment
(Capacitor, Resistance), Diode Test, Save to
Memory, LCD backlight*,
*: For model 734 02 only
Measuring method: Σmodulation
Display: 5-digit (LCD)
Maximum Reading: 50000
PolarityIndicator: “–” Appears automatically when
the polarity is negative
Overrange Indicator: “ OL ”
Low-battery Indicator: “ ” Appears when the
batteries become low
Measurement cycle: Digital display 3 times per second
Whenfrequencymeasurement: one times per second
When capacitor measurement (50mF): max. 0.03
time per second
Bar graph display 10 times per second