YOKOGAWA 701944 User manual

User’s
Manual Model 701944/701945
100:1 Probe
IM 701944-01E
7th Edition

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PIM 103-06E-A5

1
IM701944-01E
Thank you for purchasing the 701944 or 701945 100:1 probe. To ensure correct
use, please read this manual thoroughly before beginning operation. After
reading this manual, keep it in a convenient location for quick reference in the
event a question arises during operation.
List of Manuals
The following manuals are provided for the 701944 and 701945 probe.
Manual Title Manual Number Description
Model 701944/701945
100:1 Probe
User’s Manual
IM 701944-01E This manual. Explains usage,
specifications, and the handling
precautions of the 701944/701945.
Model 701944/701945
100:1 Probe
IM 701944-92 Document for China.
Safety Instruction Manual IM 00C01C01-01Z1 Safety manual (European languages)
The “E” and “Z1” in the manual numbers are the language codes.
Contact information of Yokogawa o󰀩ces worldwide is provided on the following
sheet.
Document Number Description
PIM 113-01Z2 List of worldwide contacts
Notes
• The contents of this manual are subject to change without prior notice
as a result of continuing improvements to the product’s performance and
functionality. The gures given in this manual may di󰀨er from those that
actually appear on your product.
• Every e󰀨ort has been made in the preparation of this manual to ensure the
accuracy of its contents. However, should you have any questions or nd
any errors, please contact your nearest YOKOGAWA dealer.
• Copying or reproducing all or any part of the contents of this manual without
the permission of YOKOGAWA is strictly prohibited.
Trademarks
• Adobe and Acrobat are either registered trademarks or trademarks of Adobe
Systems Incorporated.
• In this manual, the ® and TM symbols do not accompany their respective
registered trademark or trademark names.
• Other company and product names are trademarks or registered trademarks
of their respective holders.
Revisions
• 1st Edition November 2006
• 2nd Edition March 2007
• 3rd Edition March 2011
• 4th Edition March 2016
• 5th Edition October 2017
• 6th Edition June 2021
• 7th Edition May 2022
7th Edition: May 2022 (YMI)
All Rights Reserved, Copyright © 2006 Yokogawa Electric Corporation
All Rights Reserved, Copyright © 2011 Yokogawa Test & Measurement Corporation

2IM701944-01E
Conventions Used in This Manual
Improper handling or use can lead to injury to the user or damage
to the instrument. This symbol appears on the instrument to
indicate that the user must refer to the user’s manual for special
instructions. The same symbol appears in the corresponding place
in the user’s manual to identify those instructions. In the manual,
the symbol is used in conjunction with the word “WARNING” or
“CAUTION.”
WARNING Describes precautions that should be observed to prevent serious
injury or death to the user.
CAUTION Describes precautions that should be observed to prevent minor
or moderate injury, or damage to the instrument.
Note Provides important information for the proper operation of the
instrument.
Safety Precautions
This product is designed to be used by a person with specialized knowledge. To
safely operate this product and to fully utilize its functionality, strictly observe the
following cautions.
This product complies with the requirements stated in measurement categories
II dened in IEC 61010-031.
If this probe is operated in a manner not specied in this manual, this may
cause the protection capability of this product to lessen. YOKOGAWA shall not
be held responsible for defects arising from negligence of such warning and
caution, and also shall not guarantee the product in such case. Before using
this probe, thoroughly read the instruction manual for measuring instrument to
fully understand the specications and handling precautions for safe and correct
operation.
WARNING
• Purpose of the product
The product is used in combination with an oscilloscope to
observe and measure electrical signals. Do not use for any other
purpose.
• Grounding of the measuring instrument
The protective grounding terminal of the oscilloscope must be
connected to ground.
• Grounding of the probe
Make sure to connect the ground lead of the probe to the
grounding potential.
• Be careful of electric shock
Never use the probe with wet hands or when the probe itself
is wet. Doing so may cause electric shock. Be careful of
electric shock when you connect the probe to the device under
measurement. Do not remove the probe from the oscilloscope
while connected to the device under measurement.

3
IM701944-01E
• Do not operate in wet or damp conditions
To prevent electric shock, do not operate the probe in wet or
damp conditions.
• Avoid exposed circuitry
To prevent electric shock, remove metal and jewelry such
as watches and rings. Do not touch exposed connections or
components when power is present on the device.
• Do not operate in explosive atmosphere
To prevent injury or re hazard, do not operate the probe in an
atmosphere of ammable or explosive gases or vapors.
• Do not operate with suspected failures
Stop using the probe If you suspect that the probe is damaged.
Consult your nearest YOKOGAWA dealer.
• Do not operate with a damaged signal cable
If the signal cable is torn and the inner metal is exposed or if
a color di󰀨erent from the outer sheath appears, stop using the
cable.
• Do not disassemble or modify
Do not disassemble or modify the product. YOKOGAWA assumes
no liability if you disassemble or modify the product.
• Observe the maximum input voltage
Do not apply a voltage exceeding the maximum input voltage to
the probe. When the oscilloscope’s input coupling is AC, a DC
voltage is applied to the oscilloscope’s input at the same electric
potential as the probe’s input. Make sure not to exceed the
oscilloscope’s maximum input voltage.
French
AVERTISSEMENT
• But du produit
Le produit est utilisé en association avec un oscilloscope pour
observer et mesurer des signaux électriques. Ne l’utilisez pas à
d’autres ns.
• Mise à la terre de l’instrument de mesure
La borne de terre de protection de l’oscilloscope doit être
connectée à la terre.
• Mise à la terre de la sonde
Assurez-vous de connecter le l de terre ou l’accessoire
équivalent de la sonde au potentiel de mise à la terre.
• Faites attention au choc électrique
N’utilisez jamais la sonde les mains mouillées ou lorsque la
sonde elle-même est mouillée. Cela pourrait provoquer un choc
électrique. Faites attention au choc électrique lorsque vous
connectez la sonde à l’appareil à mesurer. Ne retirez pas la
sonde de l’oscilloscope lorsqu’il est connecté à l’appareil en cours
de mesure.
• N’opérez pas dans des conditions mouillées ou humides
Pour éviter un choc électrique, ne faites pas fonctionner la sonde
dans des conditions mouillées ou humides.

4IM701944-01E
• Évitez les circuits exposés
Pour éviter un choc électrique, retirez le métal et les bijoux tels
que les montres et les bagues. Ne touchez pas les connexions ou
composants exposés en présence de courant sur l’appareil.
• N’opérez pas dans une atmosphère explosive
Pour éviter les blessures et les risques d’incendie, n’utilisez pas la
sonde dans une atmosphère de gaz ou des vapeurs inammables
ou explosifs.
• N’opérez pas en cas de défaillances suspectées
Arrêtez d’utiliser la sonde si vous pensez qu’elle est
endommagée. Consultez votre revendeur YOKOGAWA le plus
proche.
• N’opérez pas avec le câble de signal endommagé
Si le câble de signal est coupé et que le métal interne est exposé
ou si une couleur di󰀨érente de la gaine extérieure apparaît,
arrêtez d’utiliser le câble.
• Nedémontezoumodiezpas
Ne démontez ou modiez pas le produit. YOKOGAWA n’assume
aucune responsabilité si vous démontez ou modiez le produit.
• Respectez la tension d’entrée maximale
N’appliquez pas une tension supérieure à la tension d’entrée
maximale sur la sonde. Lorsque le couplage d’entrée de
l’oscilloscope est AC, une tension DC est appliquée à l’entrée
de l’oscilloscope au même potentiel électrique que l’entrée de
la sonde. Assurez-vous de ne pas dépasser la tension d’entrée
maximale de l’oscilloscope.
Regulations and Sales in Various Countries and Regions
Waste Electrical and Electronic Equipment (WEEE)
(EU WEEE Directive valid only in the EEA* and UK WEEE Regulation
in the UK)
This product complies with the WEEE marking requirement. This
marking indicates that you must not discard this electrical/electronic
product in domestic household waste. When disposing of products in
the EEA or UK, contact your local Yokogawa o󰀩ce in the EEA or UK
respectively.
* EEA: European Economic Area
UKCA Marking
This product complies with the UKCA (UK Conformity Assessed)
marking.
Authorized Representative in the EEA (AR)
Yokogawa Europe B.V. is the authorized representative of Yokogawa Test &
Measurement Corporation for this product in the EEA. To contact Yokogawa
Europe B.V., see the separate list of worldwide contacts, PIM 113-01Z2.
Disposal
When disposing of YOKOGAWA products, follow the laws and ordinances of the
country or region where the product will be disposed of.

5
IM701944-01E
Overview
Model 701944 and 701945 are high voltage probes with attenuation ratio of
100:1. The very sharp probe tip is spring loaded and minimizes the pressure
to the device under measurement. It also prevents the probe from slipping on
the board surface. In particular, the spring mechanism is useful when using the
probe with it inclined. In addition, various accessories are available.
Conguration
Standard and Optional Accessories
Standard Accessories Optional Accessories
Probe unit (701944 or 701945) Flexible adapter
Spring tip* 4mm plug ground lead
Rigid tip Safety alligator clip
Pincher tip
Insulation cap
Protection cap*
Ground lead
Color marker (4 colors x 3)
Adjustment tool
Manuals
* Attached to the probe unit
Replaceable Parts Set
Two sets of replaceable parts are available.
Set name : Accessories Basic
(Part number : B9852HK)
Set name : Accessories HV
(Part number : B9852HL)
Packaged items Quantity Packaged items Quantity
Spring tip* 2 Flexible adapter 1
Rigid tip 2 4mm plug ground lead 1
Pincher tip 2 Safety alligator clip 2
Ground lead 2

6IM701944-01E
Combinations of Accessories
CAUTION
• Use the ground lead only for grounding connections.
• Do not use any accessories other than those specied.
French
ATTENTION
• Utilisez le l de terre uniquement pour les connexions de mise à
la terre.
• N’utilisez pas d’accessoires autres que ceux spéciés.
Adjustment Tool
Ground Lead (length 22 cm)
4-mm Plug Ground Lead
(length 22 cm, option)
Pincher Tip
Flexible Adapter (option)
Spring Tip
(Ø 0.8mm)
Rigid Tip
(Ø 0.8mm)
Insulating Cap
Protection Cap
Safety Alligator Clip (option)
Probe Unit
Color Marker
4 colors x 3

7
IM701944-01E
Specications
The specications described in this section apply to the probe connected to
Yokogawa’s oscilloscope and may vary depending on the type of oscilloscope
connected. The preconditions for the following specications are that the
instrument should be warmed up for at least 20 minutes and the environmental
conditions should not exceed the specied limits of the probe.
ElectricalSpecications
Item 701944 701945
Attenuation Ratio1100:1 ±2% (DC) 100:1 ±2% (DC)
Voltage Coefficient 0.0005 %/V (typical value) 0.0005 %/V (typical value)
System Bandwidth2400 MHz (–3 dB) 250 MHz (–3 dB)
Probe Rise Time < 900 ps (10% to 90%) < 1.4ns (10% to 90%)
Maximum Input Voltage31000 Vrms 1000 Vrms
1 This specication value is obtained when the probe is connected to an oscilloscope having an input
resistance of 1 MΩ ± 1%.
2 This specication value is obtained when the probe is connected to an oscilloscope having a
bandwidth of 500 MHz or greater.
When the probe is connected to an oscilloscope having a bandwidth of less than 500 MHz,
depends on the bandwidth of the oscilloscope main unit.
3 See the compatible standards shown below. See also “Voltage Derating.”
Electrical Characteristics
Input Resistance (system) 50 MΩ ± 1%
Input Capacitance (system) 7.5 pF (typical value)
Input Impedance (system) See also “Input Impedance.”
Compensation Range 10 pF to 50 pF (typical value)
Input Coupling of the measuring instrument 1 MΩ DC/AC
Mechanical Characteristics
Weight (probe only) Approx. 55 g
Cable Length Approx. 1.2 m (701944), 3 m (701945)
External Dimensions
81
Ø 14.5
Ø 3.5
151
Ø 18.3 Ø 6.5
Unit: mm
Ø 11

8IM701944-01E
EnvironmentalSpecications
Altitude Operating: Up to 2000 m
Storage: Up to 15000 m
Temperature Operating: 0 °C to 50 °C
Storage: –40 °C to 71 °C
Maximum Relative Humidity Operating: Relative humidity of 80% at a temperature
of up to 31 °C, decreasing linearly to relative
humidity of 40% at 50 °C if the temperature is
31 °C or higher.
Compliant Standards
Safety Standards EN 61010-031
Measurement Category “O”11000 Vrms, 4000 V transient
over-voltage
Measurement Category II11000 Vrms
Pollution Degree 22
Environmental Standards2EU RoHS Directive compliant
1 The product is for measurement category II (CAT II). Do not use it with measurement category III
(CAT III), nor measurement category IV (CAT IV). When using devices or accessories with di󰀨erent
measurement categories, the lower measurement category applies. See below for denitions of
measurement categories.
2 Pollution degree refers to the degree of adhesion of a solid, liquid, or gas which deteriorates
withstand voltage or surface resistivity. Pollution Degree 2 applies to normal indoor atmospheres
(usually with only non-conductive pollution).
3 For conformity to environmental regulations and/or standards other than EU, contact your nearest
Yokogawa o󰀩ce (PIM 113-01Z2).
DenitionsofMeasurementCategories
Measurement Category “O” (Other) It applies to measurement of a circuit that is not
connected directly to the main power source.
Measurement Category II (CAT II) It applies to measurement of electrical equipment
that is powered through a fixed installation such
as a wall outlet wired to a distribution board and
measurement on such wiring.
Measurement Category III (CAT III) It applies to measurement at the distribution level,
that is, building wiring, fixed installations.
Measurement Category IV (CAT IV) It applies to measurement at the primary supply
level, that is, overhead lines, cable systems.

9
IM701944-01E
Voltage Derating
CAUTION
As the frequency of the input signal increases, the maximum
input voltage of the probe decreases. See Specications for the
appropriate input voltage.
French
ATTENTION
Lorsque la fréquence du signal d’entrée augmente, la tension
d’entrée maximale de la sonde diminue. Voir les spécications pour
la tension d’entrée appropriée.
Typical Voltage Derating
0
200
400
600
800
1000
1200
0.1 1 10 1001000
Frequency [MHz]
Amplitude AC rms [V]Sinus
Input Impedance
CAUTION
As the frequency of the input signal increases, the input impedance
of the probe decreases.
French
ATTENTION
Lorsque la fréquence du signal d’entrée augmente, l’impédance
d’entrée de la sonde diminue.

10 IM701944-01E
Typical InputImpedance
0.01
0.10
1.00
10.00
100.00
1000.00
10000.00
100000.00
1E-05 0.0001 0.001 0.01 0.1 1 10 1001000
Frequency [MHz]
|Z| [kΩ]
Maximum Pulse Ratings
For pulse measurements make sure to comply with the ratings as shown below.
0
1000
2000
3000
4000
5000
6000
7000
8000
0 200 400 600 800 1000
Peak Pulse Voltage [V]
AC rms or DC [V]
RMS vs. Peak Pulse Voltage
Maximum Pulse Derating
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
10 1001000
Duration [ms]
Maximum Peak Pulse Voltage [V]
10%
25%
50%
Duty cycle

11
IM701944-01E
Handling
CAUTION
• Since the contact tips are very thin and sharp, handle them with
care.
• Avoid shock to the probe body. Do not bend or pull the cables
excessively. Doing so may damage or disconnect the probe.
French
ATTENTION
• Les pointes de contact étant très nes et pointues, manipulezles
avec precaution.
• Évitez les chocs sur le corps de la sonde. Ne pliez pas et ne tirez
pas les câbles de manière excessive. Cela pourrait endommager
ou déconnecter la sonde.
Adjustment Procedures
LF Compensation
LF needs to be adjusted when the probe is connected to the scope input
the rst time. LF compensation matches the probes cable capacitance to
the oscilloscope input capacitance. This matching assures good amplitude
accuracy from DC to upper bandwidth limit frequencies. A poorly compensated
probe clearly inuences the overall system performance (probe + scope) and
introduces measurement errors resulting in inaccurate readings and distorted
waveforms.
LF compensation is performed by connecting the probe to the COMP-output on
the oscilloscope and adjust the LF compensation trimmer (see also the Figs.
below.) optimum square wave response.
Under compensated
Optimum Over compensated
LF Compensation

12 IM701944-01E
HF Compensation
HF needs to be adjusted when the probe is connected to the scope input the
rst time.
HF adjustment is performed by connecting the probe to a rectangular wave
generator with rst rise time. Adjust the trimmer for optimum wave response.
Optimum
DC Adjustment
In order to provide highest accuracy this probes dividing ratio is factory adjusted
using 500 VDC source and measuring device with a precision input impedance
of 1 MΩ ± 1%.
LF Compensation DC
HF Compensation
Maintenance
Cleaning
When cleaning the exterior of the probe, clean it using a soft cloth rag moistened
with either water or isopropyl alcohol. In this case, dry the probe completely
before starting the measurement.
Changing the Contact Tip
To change the contact tip, grip the contact tip rmly with pliers and carefully
pull it straight out of its contact socket along the axis of the probe. Do not grip
the white plastic insulator or the housing with pliers, because this will damage
the probe. If the contact tip is removed, the new contact tip can be inserted
with pliers into the socket, along the axis of the probe. To insert the contact
tip completely into the housing, press the contact tip against a hard surface
carefully.
Use pliers to grip and pull the contact
tip carefully out of its contact socket.
Do not grip the white plastic insulator
or the housing with pliers.