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

4
Operating temperature and humidity ranges:
-10 to 50ºC, 80%RH or less (no condensation)
70%RH or less at 40 to 50ºC.
Storage temperature and humidity ranges:
-25 to 60ºC, 70%RH or less (no condensation)
Temperature coefficient:(Accuracy at 23±5ºC× 0.05)/ºC or less
(Temperature ranges: -10 to 18ºC and 28 to 50ºC)
Operating altitude: 2000m max. above sea level
Power supply: AA-size (R6) 1.5V batteries: 2
Battery life: Approximately 120 hours
(Operating hours of alkaline batteries when in DC
voltage-mode.)
Note: The battery life varies depending on the
operating conditions.
Withstand voltage: 5.5kVrms AC for one minute
(across input terminals and casing)
External dimensions: Approximately 85(W)×191(H)×40(D)mm
Weight: Approximately 450g
Complied standards: Safety standards
EN61010-1; 1995, EN61010-2-031; 1995
Overvoltage category III (Max. input voltage:
AC/DC600V)
Overvoltage category II (Max. input voltage:
AC/DC1000V)
Pollution degree 2
EMC standards
EMI (Electro Magnetic Interference)
EN55011; 1998
EN61326-1; 1997+A1;1998
(Class B, Group 1)

5
EMS (Immunity)
EN50082-1; 1997
EN61326-1; 1997+A1;1998
Effect of radiation immunity:
Accuracy range of reading:
[Rated accuracy +12% of maximum reading] for
the strength of a radio-frequency electromagnetic
field of 3V/m
Standard accessories: Instruction manual: 1
Testing leads: 1set
Batteries (included): 2
Fuse (included)
500mA/600V, 15A/600V
Optional accessories: Communication package with communication cable
Engligh version 920 01-E
Package with RS-232C Cable 920 01-E/P
Temperature probes 7511 02 to 05
Carrying case
For the 734 main unit with testing leads
B9646HH
For the 734 main unit with testing leads
and communication cable 930 14
Fuse
500mA/600V A1518EF
15A/600V A1519EF
Testing leads (1set) RD031
Printer 97010
AC adapter (for printer, Europe) 940 06
AC adapter (for printer, USA) 940 07
Thermal paper for printer (10 rolls) 970 80
RS-232C Cable (for printer) 910 15

6
2-2 Measurement Ranges
Test conditions:
Temperature and humidity: 23±5ºC at 80%RH or less
Accuracy: ±(percentage of reading + number of digits)
Note: Each response time is a value to rated accuracy within
selected range.
DC Voltage Measurement V
Range Resolution
50mV
500mV
2400mV
5V
50V
500V
1000V
0.001mV
0.01mV
0.1mV
0.0001V
0.001V
0.01V
0.1V
Input
Resistance Maximum Input Voltage
Accuracy
73401 73402
0.1+10
0.04+2
0.07+2
0.05+10
0.02+2
0.025+5
0.03+2
Approx.
100M‰
10M‰
1000V DC
1000V
rms AC
*: Maximum Reading of 2400mV Range: 24000
NMRR: 80dB or more 50/60Hz –0.1%
CMRR: 120dB or more 50/60Hz (Rs=1k‰)
Response time: 1 sec max.
*
AC Voltage Measurement V
734 01
Accuracy
Resolution Range 10k to
20kHz
1k to
10kHz
20Hz to
1kHz
10 to
20Hz
Input
Impe-
dance
Maximum
Input
Voltage
0.01mV
0.0001V
0.001V
0.01V
0.1V
500mV
5V
50V
500V
1000V
1.5+30
*1
*2
0.7+30
*1
3+30
*2
*2
2+50
*2
---
11MΩ
<50pF
10MΩ
<50pF
1000V
rms AC
1000V
DC
AC Coupling, Rms-value detection, Crest factor: <3

7
AC Voltage Measurement V
734 02
Accuracy
Reso-
lution
Range
10 to
20Hz 1k to 10kHz
20Hz to
1kHz 10k to 20kHz 20k to 50kHz 50k to 100kHz
Input
Impe-
dance
Maxi-
mum
Input
Voltage
1000V
rms
AC
1000V
DC
11MΩ
<50pF
500mV
5V
50V
500V
1000V
0.01mV
0.0001V
0.001V
0.01V
0.1V
1+30
*1
*2
0.4+30
*1 2+70
*2 5+200 *2
1+40
*1
3+30
*2
*2
---
AC Coupling, Rms-value detection, Crest factor: <3
Accuracy
*1: At 5 to 100% of range
*2: At 10 to 100% of range
CMRR: 80dB or more DC to 60Hz (Rs=1kΩ)
Response time: 2 sec max.
10MΩ
<50pF
DCV+ACV +
734 01
Accuracy
Resolution Range
DC, 10k
to 20kHz
DC, 1k
to 10kHz
DC, 20Hz
to 1kHz
Input
Impe-
dance
Maximum
Input
Voltage
0.001V
0.01V
0.1V
1V
5V
50V
500V
1000V
1+10
*1
1.5+10
*1
*2
DC, 10
to 20Hz
*2
2+10
*2
---
11MΩ
<50pF
10MΩ
<50pF
1000V
rms AC
1000V
DC
Maximum Reading 5000, Crest factor: <3

8
DCV+ACV +
734 02
Accuracy
Reso-
lution
Range
DC,
10 to
20Hz
DC,
1k to
10kHz
DC,
20Hz to
1kHz
DC,
10k to
20kHz
DC,
20k to
50kHz
DC,
50k to
100kHz
Input
Impe-
dance
Maxi-
mum
Input
Voltage
1000V
rms
AC
1000V
DC
11MΩ
<50pF
10MΩ
<50pF
5V
50V
500V
1000V
0.001V
0.01V
0.1V
1V
1.5+10
*1
*2
0.5+10
*1 2+10
*2 5+20 *2
1+10
*1
*2
---
Maximum Reading 5000, Crest factor: <3
Accuracy
*1: At 5 to 100% of range
*2: At 10 to 100% of range
CMRR: 80dB or more DC to 60Hz (Rs=1kΩ)
Response time: Approx. 5 sec
DC Current Measurement A
Range
500µA
5000µA
50mA
500mA
5A
10A
0.01µA
0.1µA
0.001mA
0.01mA
0.0001A
0.001A
0.2+2
0.6+2
500mA
Protected by a
500mA/600V
fuse.
15A
Protected by a
15A/600V fuse.
<0.11mV/µA
<4mV/mA
<0.1V/A
Resolution Voltage Drop
Maximum
Input Current
Accuracy
73401/02
Response time: 1 sec max.

9
AC Current Measurement A
734 01
Range Accuracy Maximum
Input Current
Resolution
500µA
5000µA
50mA
500mA
5A
10A
0.01µA
0.1µA
0.001mA
0.01mA
0.0001A
0.001A
1.5+20 1+20
500mA
Protected by a
500mA/600V
fuse.
15A
Protected by a
15A/600V fuse.
<0.11
mV/µA
<4mV/mA
<0.1V/A
Voltage Drop
10 to 20Hz 20Hz to 1kHz
Crest factor: <3
AC Current Measurement A
734 02
Accuracy
Resolution Range 1k to
5kHz
20Hz to
1kHz
10 to
20Hz
Voltage
Drop Maximum Input Current
0.01µA
0.1µA
0.001mA
0.01mA
0.0001A
0.001A
500µA
5000µA
50mA
500mA
5A
10A
1+20 0.75
+20 1+30
1.5+20 1+20 2+30
<0.11
mV/µA
500mA
Protected by a
500mA/600V
fuse.
15A
Protected by a
15A/600V fuse.
<4
mV/mA
<0.1
V/A
Crest factor: <3
Model 734 01/02
Accuracy
At 5 to 100% of range
Note: At 10 to 100% of range for 10A Range
Response time: 2 sec max.

10
DCA+ACA +
734 01
ResolutionRange
0.1µA
1µA
0.01mA
0.1mA
0.001A
0.01A
500µA
5000µA
50mA
500mA
5A
10A
Accuracy Maximum
Input Current
Voltage
Drop
DC, 10
to 20Hz
2+10
DC, 20Hz
to 1kHz
1.5+10
<0.11
mV/µA
<4mV/mA
<0.1V/A
500mA
Protected by a
500mA/600V
fuse.
15A
Protected by a
15A/600V fuse.
Maximum Reading 5000, Crest factor: <3
DCA+ACA +
734 02
Accuracy
Resolution Range
DC, 1k
to 5kHz
DC, 20Hz
to 1kHz
DC, 10
to 20Hz
Maximum
Input
Current
Voltage
Drop
0.1µA
1µA
0.01mA
0.1mA
0.001A
0.01A
500µA
5000µA
50mA
500mA
5A
10A
1.5+10 1+10 1.5+10
2+10 1.5+10 3+10
<0.11
mV/µA
<4
mV/mA
<0.1
V/A
500mA
Protected by a
500mA/600V
fuse.
15A
Protected by a
15A/600Vfuse.
Crest factor: <3
Model 734 01/02
Accuracy
At 5 to 100% of range
Note: At 10 to 100% of range for 10A Range
Response time: Approx. 5 sec

11
Resistance Measurement Ω
Range
500Ω
5kΩ
50kΩ
500kΩ
5MΩ
50MΩ
0.1+2 0.05+2
0.5+2
1+2
<1mA
<0.25mA
<25µA
<2.5µA
<1.5µA
<0.13µA
<2.5V 600V rms
0.01Ω
0.0001kΩ
0.001kΩ
0.01kΩ
0.0001MΩ
0.001MΩ
Resolution Accuracy
73401 73402 Measuring
Current Open-loop Voltage
Input
Protective
Voltage
Accuracy is specified after zero adjustment
(resistance).
Response time: 3 sec max. at 500Ωto 500kΩ
10 sec max. at 5MΩto 50MΩ
Continuity Check
Range Resolution Measuring
Current Open-loop Voltage
Input
Protective
Voltage
Range of Operation
500Ω0.1ΩApprox.
0.5mA <5V
600V rms
The buzzer turns on for
resistances lower than
100±50Ω.
Maximum Reading 5000
Diode Test
Range Resolution Open-loop
Voltage
Input
Protective
Voltage
Measuring
Current
(Vf=0.6V)
Accuracy
2.4V 0.0001V Approx.
0.5mA <5V 600V rms
1+2

12
Temperature Measurement TEMP
Range Resolution Accuracy
-58 to 1472˚F 0.1˚F 1+3.0˚F 600V rms
-50 to 800˚C 0.1˚C 1+1.5˚C
Input Protective
Voltage
Use optional Temperature Orobe: Thermocouple Type K
Capacitor Measurement
Input Protective
Voltage
Range
5nF
50nF
500nF
5µF
50µF
500µF
5mF
50mF
0.001nF
0.01nF
0.1nF
0.001µF
0.01µF
0.1µF
0.001mF
0.01mF
1+5
2+5
3+5
600V rms
Resolution Accuracy
Accuracy is specified after zero adjustment
(capacitor).
Frequency Measurement Hz
Range (AUTO)
2.000 to 9.999Hz
9.00 to 99.99Hz
90.0 to 999.9Hz
900 to 9999Hz
9.00 to 99.99kHz
0.001Hz
0.01Hz
0.1Hz
1Hz
0.01kHz
0.02+1
*1
*2
AccuracyResolution
AC Coupling, Maximum Reading 9999
Accuracy
*1: At 10 to 100% of input voltage or current range
*2: At 40 to 100% of input voltage or current range

13
Duty cycle ratio Hz
Range Resolution Accuracy
10 to 90% 1% ±1%*
Accuracy
*: At 10.00Hz to 500.0Hz, square wave
At 40 to 100% of input voltage or current range
Peak Hold P•H
Maximum Reading 5000
Range Accuracy Response Time
Maximum
DCV, DCA ±100 digit >1msec