Hioki PR8111 User manual

PR8111
PR8112
Instruction Manual
PEN RECORDER
EN
Feb. 2020 Revised edition 3
PR8111A981-03 20-02H

Contents
i
Contents
Basic Operation.............................................. 1
Introduction..................................................... 2
Confirming Package Contents........................ 2
Safety Information .......................................... 3
Operating Precautions.................................... 5
Chapter 1
Overview 9
1.1 Product Overview and Features .......... 9
1.2 Names and Functions of Parts ........... 10
SPAN (span adjustment) .......................... 12
Chart cover ............................................... 12
Chapter 2
Measurement Preparations 13
2.1 Pre-Operation Inspection ................... 13
2.2 Loading Recording Paper ..................14
Loading Fanfold Recording Paper ............ 14
Loading Roll Recording Paper.................. 15
2.3 Installing the Pens .............................. 16
Installing Pens and Using the Pen Caps .. 16
2.4 Connecting the Power Source
(Alkaline Batteries or AC Adapter) ..... 17
Installing Alkaline Batteries....................... 17
Connecting the AC adapter ...................... 18
Using a DC Power Source........................ 18
2.5 Turning the Instrument On and Off .... 19
2.6 Connecting Measurement Cables
to the Input Terminals ........................ 20
2.7 Attaching and Detaching the Front
Cover ................................................. 21
2.8 Attaching the Drip-proof Vinyl Cover .. 22
Chapter 3
Configuring the Instrument
and Taking Measurements 23
3.1 Configuration and Measurement
Process ..............................................23
3.2 Basic Measurement ............................24
Select a Measurement Range (RANGE) . 24
Move the Pen Position (POSITION) ........ 24
Set the Paper Feed Speed
(CHART SPEED) ..................................... 24
Lower the Pens (pen lever)...................... 24
Start Measurement .................................. 25
Stop Measurement................................... 25
Remove the Recording Paper.................. 25
Cap the Pens ........................................... 25
3.3 Using Only One channel
(PR8112 Only) ....................................26
3.4 Example Printout ................................27
Chapter 4 Specifications 29
Chapter 5
Maintenance and Service 33
5.1 Inspection, Repair, and Cleaning .......33
Transporting............................................. 33
Storing the Instrument.............................. 33
Replaceable Parts and Operating
Lifetimes................................................... 34
Cleaning................................................... 34
5.2 Troubleshooting ..................................35
Before Returning for Repair ..................... 35
5.3 Outline Drawings ................................36
PR8111A981-03

Contents
ii

Basic Operation
1
Basic Operation
Unpacking and Preparing for Use
Install recording paper (p. 14)
and pens (p. 16)
Install batteries (p. 17)
(When powering the instru-
ment with batteries)
Check the package contents
(p. 2)
Review operating precau-
tions (p. 5)
"Names and Functions of Parts" (p. 10)
Before using the instrument, be sure to read "Operating Precautions"
(p. 5) carefully.
Pens
Installing, Connecting, and Turning On the Instrument
Turn on the instrument
(p. 19)
Inspect and connect the
instrument (p. 13)
Install the instrument (p. 5)
Connect measurement
cables (p. 20) (When powering the instrument with mains power)
Connect the included AC adapter (p. 18)
The green LED lights up when using the
AC adapter and when there is sufficient
battery life remaining when using batteries.
Settings
Set measurement conditions
(p. 23)
•Set the range and position.
•Set the chart speed.
Starting and Stopping Measurement
Lowering the pens and starting recording ⇒⇒⇒⇒⇒⇒Stopping recording and raising the pens (p. 25)
(PEN DOWN) ⇒(START) (STOP) ⇒(PEN UP)
Finishing Using the Instrument
Turn off the instrument

Introduction
2
Thank you for purchasing the HIOKI Model PR8111, PR8112 Pen Recorder. To obtain maxi-
mum performance from the instrument, please read this manual first, and keep it handy for
future reference.
The PR8111 is a 1-pen model, while the PR8112 is a 2-pen model.
Inspecting the instrument
Package contents
Options
The following options are available for the instrument. Contact your authorized Hioki distributor or reseller
when ordering. The options are subject to change. Visit our website for updated information.
Introduction
Confirming Package Contents
When you receive the instrument, inspect it carefully to ensure that no damage occurred during ship-
ping. In particular, check the accessories, panel switches, and connectors. If damage is evident, or if it
fails to operate according to the specifications, contact your dealer or Hioki representative.
Confirm that these contents are provided.
Model PR8111 or PR8112............................1
Model 9418-15 AC Adapter .........................1
Included power cord (p. 18)
Drip-proof vinyl cover...................................1
Front cover...................................................1
(Example: PR8112)
Model P-1201A (Red), P-1202A (Green)
Felt Pen...............................................1 each
(PR8111: P-1201A [red] only)
Model SE-10Z-2 Recording Paper (fanfold) 1
Instruction Manual (this document)............. 1
Use the original packing materials when transporting the instrument, if possible.
For other precautions related to transporting the instrument, see"Transporting" (p. 33).
Felt Pen
P-1201A (Red: standard) P-1201B (Red: High-speed) P-1201C (Red: Low-speed)
P-1202A (Green: Standard) P-1202B* (Green: High-speed) P-1202C (Green: Low-speed)
P-1203A (Blue: Standard) P-1203B *(Blue: High-speed) P-1203C (Blue: Low-speed)
Recording Paper *: Discontinued product
SE-10Z-2 Recording Paper (fanfold) SE-10 Recording Paper (roll)

Safety Information
3
This manual contains information and warnings essential for safe operation of the instrument
and for maintaining it in safe operating condition. Before using it, be sure to carefully read the
following safety precautions.
The following symbols in this manual indicate the relative importance of cautions and warn-
ings.
Safety Information
This instrument is designed to comply with IEC 61010 Safety Standards, and has
been thoroughly tested for safety prior to shipment. However, mishandling during
use could result in injury or death, as well as damage to the instrument. Using the
instrument in a way not described in this manual may negate the provided safety fea-
tures.
Be certain that you understand the instructions and precautions in the manual before
use. We disclaim any responsibility for accidents or injuries not resulting directly
from instrument defects.
Safety Symbols
In the manual, the symbol indicates particularly important information that the user
should read before using the instrument.
The symbol printed on the instrument indicates that the user should refer to a corre-
sponding topic in the manual (marked with the symbol) before using the relevant func-
tion.
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
Indicates a ground terminal connected to the chassis of the system.
Indicates DC (Direct Current).
Indicates that incorrect operation presents an extreme hazard that could result in serious
injury or death to the user.
Indicates that incorrect operation presents a significant hazard that could result in serious
injury or death to the user.
Indicates that incorrect operation presents a possibility of injury to the user or damage to
the instrument.
Indicates advisory items related to performance or correct operation of the instrument.

Safety Information
4
Symbols for Various Standards
Indicates that the product conforms to regulations set out by the EU Directive.
WEEE marking:
This symbol indicates that the electrical and electronic appliance is put on the EU market af-
ter August 13, 2005, and producers of the Member States are required to display it on the
appliance under Article 11.2 of Directive 2002/96/EC (WEEE).
Other Symbols
Indicates the prohibited action.
(p. ) Indicates the location of reference information.
*Indicates that descriptive information is provided below.
SET
(boldface) Text displayed on the instrument is shown in boldface in the manual.
Measurement categories
This instrument complies with CAT II safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes safety standards for various electrical
environments, categorized as CAT II to CAT IV, and called measurement categories.
CAT II: Primary electrical circuits in equipment connected to an
AC electrical outlet by a power cord (portable tools,
household appliances, etc.)
CAT II covers directly measuring electrical outlet recep-
tacles.
CAT III: Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets.
CAT IV: The circuit from the service drop to the service entrance,
and to the power meter and primary overcurrent
protection device (distribution panel).
Using a measurement instrument in an environment designated with a higher-numbered category than that for which
the instrument is rated could result in a severe accident, and must be carefully avoided.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV measurement applications could result in
a severe accident, and must be carefully avoided.

Operating Precautions
5
Follow these precautions to ensure safe operation and to obtain the full benefits of the various
functions.
Be sure to observe the operating and storage temperature and humidity ranges specified for
the instrument:
• Operating temperature and humidity: 0°C to 40°C, 40% to 80% RH (non-condensing)
• Storage temperature and humidity: -20°C to 55°C, 10% to 80% RH (non-condensing)
The instrument should be installed on a level surface. Use of the device on an inclined sur-
face may prevent readings from being properly recorded or recording paper from folding prop-
erly.
Operating Precautions
Preliminary Checks
•Before using the instrument for the first time, verify that it operates normally to
ensure that no damage occurred during storage or shipping. If you find any dam-
age, contact your dealer or Hioki representative.
•Before using the instrument make sure that the insulation on the power cord is
undamaged and that no bare conductors are improperly exposed. Using the instru-
ment in such conditions could cause an electric shock, so contact your dealer or
Hioki representative for repair.
•Before using the instrument, make sure that the insulation on cables is undamaged
and that no bare conductors are improperly exposed. Avoid using any cables
showing damage as they may cause electric shock.
Instrument Installation
Avoid the following locations that could cause an accident or damage to the instrument.
Exposed to direct sunlight
Exposed to high tempera-
ture
In the presence of corrosive or ex-
plosive gases
Exposed to water, oil, other
chemicals, or solvents
Exposed to high humidity
or condensation
Exposed to strong electromag-
netic fields
Near electromagnetic radiators
Exposed to high levels of
particulate dust
Near induction heating systems
(e.g., high-frequency induction
heating systems and IH cooking
utensils)
Subject to vibration

Operating Precautions
6
Handling the Instrument
•Do not allow the instrument to get wet, and do not take measurements with wet
hands. This may cause an electric shock.
•Do not attempt to modify, disassemble or repair the instrument; as fire, electric
shock and injury could result.
• To avoid damage to the instrument, protect it from physical shock when transporting and
handling. Be especially careful to avoid physical shock from dropping.
• Do not slant the device or place it on top of an uneven surface. Dropping or knocking
down the device can cause injury or damage to the device. Install the instrument on a
level surface.
• Do not install the instrument with any side except the bottom facing down. This may
cause a fire or other malfunction in the instrument.
• Exercise care to keep water droplets from accumulating on or getting into the instrument.
Failure to do so may cause the instrument to malfunction.
• Do not apply any oil. Doing so could damage the instrument.
• Never apply any grease or lubricant to the sliding surfaces of the pen holders and the
enclosure. Doing so could cause a malfunction of the pen operation or damage to the
enclosure.
Operating environment
• This instrument is intended for use indoors.
If you use the instrument in locations with an excessive amount of dust or sand, the pen
operation could malfunction.
Close the front cover, put the drip-proof cover on the instrument, and then load fanfold
paper into the instrument.
Handling pens and recording paper
• Use only genuine Hioki pens and recording paper (p. 33).
• Do not touch pens while recording is in progress.
• Do not use damp recording paper. Doing so may cause the instrument to malfunction.
• Do not reuse recording paper. Doing so may cause the paper to misfeed.
When using fanfold paper
• Ink may run at fold lines. If this running is unacceptable, please use roll paper.
• Paper may not fold properly when used in a very hot, humid environment or when record-
ing waveforms that cover a large percentage of the page. It is recommended to use roll
paper for such applications.
This product may cause interference if used in residential areas. Such use must be avoided
unless the user takes special measures to reduce electromagnetic emissions to prevent
interference to the reception of radio and television broadcasts.

Operating Precautions
7
How to install batteries: "Installing Alkaline Batteries" (p. 17)
Handling the Cords and Cables
• Avoid stepping on or pinching cables, which could damage the cable insulation.
• To avoid instrument malfunction or damage due to broken connections, do not bend or
pull on the power cord or cables at their base.
Using the Batteries
•To avoid electric shock, turn off the POWER switch and disconnect the AC adapter
and connection cables before replacing the batteries.
•After replacing the batteries, replace the cover and screws before using the instru-
ment.
•Battery may explode if mistreated. Do not short-circuit, recharge, disassemble or
dispose of in fire.
•Handle and dispose of batteries in accordance with local regulations.
•Keep batteries away from children
• Do not mix old and new batteries, or different types of batteries. Also, be careful to
observe battery polarity during installation. Otherwise, poor performance or damage from
battery leakage could result.
• Use only the specified type of battery (six LR20 alkaline batteries).
• To avoid corrosion and damage to this instrument from battery leakage, remove the bat-
teries from the instrument if it is to be stored for a long time (for a month).
• After use, always turn OFF the power.
•
You can check the remaining battery life with the LED on the left side of the instrument. (p. 10)
• The instrument’s Power LED can correctly indicate the remaining battery level only if the
instrument was turned on with unused alkaline batteries inserted.
• The Power LED color depends on the setting conditions, surrounding temperature, and
remaining battery level. Use of the instrument in a low temperature or that with weak batteries
may cause the instrument to shut down regardless of the Power LED color. Replace batteries
with unused batteries.
Use with manganese batteries
Use with manganese batteries, which cannot generate a large current because of their
small capacity, will cause a shorter operating time.

Operating Precautions
8
How to connect the adapter:"Connecting the AC adapter" (p. 18)
If you connect the AC adapter while batteries are installed in the instrument, the AC
adapter takes precedence.
Using the AC Adapter
•Use only the supplied Model 9418-15 AC Adapter. AC adapter input voltage range is
100 to 240 VAC (with ±10% stability) at 50/60 Hz. To avoid electrical hazards and
damage to the instrument, do not apply voltage outside of this range.
•To avoid electrical accidents and to maintain the safety specifications of this instru-
ment, connect the power cord provided only to a 3-contact (two-conductor +
ground) outlet.
•Turn the instrument off before connecting the AC adapter to the instrument and to
AC power.
•Before turning the instrument on, make sure the supply voltage matches that indi-
cated on the AC adapter. Connection to an improper supply voltage may damage
the instrument or AC adapter and present an electrical hazard.
• For safety reasons, disconnect the power cord when the instrument is not used and
before connecting it to a device to be tested.
• To avoid damaging the power cord, grasp the plug, not the cord, when unplugging it from
the power outlet.
Connecting Cables
•The maximum input voltage is 250 VDC. Attempting to measure voltage in excess
of the maximum input could destroy the instrument and result in personal injury or
death.
•The maximum rated voltage between input terminals and ground is 300 VAC, DC.
Attempting to measure voltages exceeding 300 V with respect to ground could
damage the instrument and result in personal injury.
•To avoid electrical accidents, confirm that all connections are secure. The
increased resistance of loose connections can lead to overheating and fire.
•To avoid experiencing an electric shock or causing a short-circuit at the input ter-
minals, only insulated crimp contacts should be used on wires being connected to
input pins. (The input terminal pin diameter is M6.)

1.1 Product Overview and Features
9
1
The PR8111 and PR8112 are compact, lightweight, highly portable pen recorders. You can select
from two power sources (AC adapter or dry-cell batteries) according to where the instrument is
being used, assuring your ability to record data immediately and easily with unparalleled reliability,
wherever you are.
Overview Chapter 1
1.1 Product Overview and Features
Record, verify, and notate
measurement results in the field
Measurement results are recorded on paper, allowing
them to be easily verified. You can also make notes on the
paper in the field. Additionally, the instrument can measure
voltage output from other equipment, allowing it to be used
in maintenance applications such as corrosion prevention
systems. It can also record analog output, for example
from sensors and physics or chemistry instruments.
Assess changes in easy-to-see
color waveforms by watching
pen movements
The instrument can use red, green, and blue
pens (option). Waveforms are easy to see, even
outdoors, and can be stored for extended periods
of time. Additionally, you can assess waveform
changes in real time simply by watching the in-
strument’s pens as they move.
Preserve important recordings
Record with the front cover open to protect
recording paper from dirt on the ground.
Record with the front cover closed to keep out
dust and wind.
You can also use the included drip-proof vinyl
cover to protect the instrument from water
droplets and dust.
Select the power source
according
to your location
The instrument can be operated us-
ing either the AC adapter or dry-cell
batteries.
Easily compare and
verify results on paper
You can easily discover changes
and abnormalities by comparing
recordings with previously record-
ed waveforms.
Operating environment
This instrument is intended for use indoors. If you use the instrument in locations with an
excessive amount of dust or sand, the pen operation could malfunction. Close the front cover,
put the drip-proof cover on the instrument, and then load fanfold paper into the instrument.

1.2 Names and Functions of Parts
10
1.2 Names and Functions of Parts
Front Panel Handle
POWER switch (p. 19)
Turns the power on and off.
:Power OFF
:Power ON
Power LED
Lights up when the instrument is being supplied with power.
Green Lights up when power is being supplied by the
AC adapter. When using batteries, indicates
ample remaining battery life.
Orange Indicates limited remaining battery life. It is rec-
ommend to have new batteries ready to use.
Red Indicates low remaining battery life. It is recom-
mended to replace the batteries in the instru-
ment with new batteries.
Operating panel (p. 11)
Front cover (p. 21)
Keeps wind and dust out of the instrument.
The cover can be removed. It opens from above.
Note: When using roll paper, either remove the
front cover or use the instrument with the cover
open. Recording data with the front cover closed
may cause paper to jam in the chart tray.
(Example: PR8112)
Chart cover (p. 12)
Holds down the recording paper.
Chart holder
(Located underneath the platen)
Stores new recording paper. (p. 14)
Chart tray
Stores paper after waveforms have been
recorded. Fanfold paper will be folded here.
Pen holders (p. 16)
(Located toward the rear of the instrument)
Holds the pens. For more information about
compatible pens, see "Options" (p. 2).
Pen lever
•CHART SET (top)
Use when changing recording paper. The pens
will move up (away from the recording paper) and
to the right.
•UP (middle)
Use when changing pens or to disable recording.
The pens will move up (away from the recording
paper). Cap pens when not recording.
•DOWN (bottom)
Use when recording. The pens will be in contact
with the recording paper, allowing them to record
data.
Pen cap storage pins (p. 16)
Store caps on these pins while the pens are being
used so they don’t get lost.
Platen
Holds down the recording paper.
Sprockets
Feed the recording paper using a series
of holes along its edges.
When the chart
cover is open

1.2 Names and Functions of Parts
11
1
RANGE knob
Selects the measurement range, allowing
you to choose the range that best suits
the voltage being measured. The 500 set-
ting is used exclusively for mV ranges.
mV/V switch
Selects the unit for the measurement
range selected with the RANGE knob.
POSITION knob
Adjusts the pen’s zero point (0 V position)
by moving its position. When the ZERO/
MEAS switch is in the ZERO position, the
pen can be moved throughout the entire
effective recording width.
ZERO/MEAS switch
•MEAS: Use when measuring data. (You can start recording by placing
the START/STOP/FEED switch in the START position.)
•ZERO: Use when adjusting the pen’s zero point.
(You can move the position with the POSITION knob.)
CHART SPEED knob
Selects the chart speed, allowing you to
change the speed at which the recording
paper is fed through the instrument.
Operating Panel h/min switch
Selects the unit for the speed set with the CHART SPEED
knob. You can select either minutes (min) or hours (h).
(Example: PR8112)
START/STOP/FEED
switch
Starts and stops the paper feed.
•START: Starts feeding paper through
the instrument.
•STOP: Stops feeding paper through
the instrument.
•FEED (by pushing the switch past
STOP): Feeds paper through the
instrument. There are four feed
speeds. You can increase the feed
speed by pressing and holding the
switch in the FEED position for at
least 2 seconds.
SPAN (p. 12)
Allows the recording width to be adjusted
using a screwdriver. This adjustment is
not usually used during normal operation.
Use as necessary when adjusting the in-
strument, for example during calibration.
• To increase the width: Turn clockwise.
(The recording width can be
increased by a maximum of about
20%.)
• To decrease the width: Turn counter-
clockwise. (The recording width can
be decreased by a maximum of about
20%.)
AC adapter terminal (p. 18)
Connect the included AC adapter here.
Battery bay and cover (p. 17)
When using batteries to power the instrument, load six
LR20 alkaline batteries here. Since the battery cover is
held in place with screws (M3), a Phillips head screw-
driver is required in order to change the batteries.
FG terminal
Use this terminal, which is connected to the instrument’s
metal chassis, to ground the chassis. For best grounding,
use a cable of 3 m or less in length.
Rear Panel
CH2 POWER switch (p. 26)
Use this switch (available only on the PR8112 [2-pen
model]) to turn CH2 (pen 2) off. Turning off CH2 lowers
the instrument’s power consumption when using only one
channel.
(Example: PR8112)
Input terminals (p. 20)
Connect the measurement cables here.
Red: Connect the cable carrying the high signal.
Black: Connect the cable carrying the low signal.
On the PR8112, the upper two terminals are CH1,
and the lower two terminals are CH2.
The PR8111 has only the upper two terminals.

1.2 Names and Functions of Parts
12
This feature is not usually used.
Perform span adjustment during calibration, when you wish to precisely realign the span
(recording paper width) to compensate for the expansion and contraction of the recording
paper, or when you wish to vary the span for other reasons.
The recording width can be adjusted with a precision slotted screwdriver.
As shown below, the chart cover can be opened up to the line indicated by the label.
Do not attempt to push the chart cover beyond the line as doing so may damage it.
SPAN (span adjustment)
• To increase the width: Turn clockwise.
(The recording width can be increased up to 20%.)
• To decrease the width: Turn counterclockwise.
(The recording width can be decreased up to 20%.)
Adjusting the span causes values to diverge from the calibrated values guaranteed by HIOKI.
After making measurements following span adjustment, have HIOKI or your nearest distribu-
tor recalibrate the instrument.
Chart cover

2.1 Pre-Operation Inspection
13
1
Measurement
Preparations Chapter 2
2.1 Pre-Operation Inspection
Do not use the instrument if you find any
damage, as doing so may result in an elec-
tric shock or short-circuit. Replace the pow-
er cord with an undamaged cord.
Yes
Is there any damage to the insulation on
the power cord, exposing metal wire?
1
No
Before using the instrument for the first time, verify that it operates normally to ensure that
no damage occurred during storage or shipping. If you find any damage, contact your dealer
or Hioki representative.
Peripheral Device Inspection
Is there any damage to the insulation on
the measurement cables, exposing metal
wire?
Yes Do not use the instrument if you find any
damage, as doing so may result in an elec-
tric shock. Replace the measurement ca-
bles with undamaged cables.
No
If you find any damage, have the instrument
repaired.
Yes
Is there any visible damage to the instru-
ment?
Instrument Inspection
When turning on the instrument
Did the power supply LED (green) light up?
No
2
The power cord may be broken, or the in-
strument may be experiencing an internal
malfunction. Have the instrument repaired.
If using batteries to power the instrument,
the batteries may be dead, or there may be
no batteries in the instrument.
• If the orange LED is on: Have new bat-
teries ready to use.
• If the red LED is on: Replace the batter-
ies with new batteries.
No
Yes
End of inspection
Be sure to read "Operating Precautions" (p. 5) before using the instrument.

2.2 Loading Recording Paper
14
You can use either fanfold or roll type recording paper in the instrument.
See: "Options" (p. 2)
2.2 Loading Recording Paper
• Please use only the specified recording paper. Using non-specified paper may not only
result in faulty printing, but printing may become impossible.
• If not loaded properly, recording paper may jam.
• Do not use wet recording paper. Doing so may damage the instrument.
• Do not reuse recording paper. Doing so may prevent the paper from feeding properly.
• Store recording paper at room temperature, taking care to avoid high temperatures and
humidity. Avoid moisture (rain or condensation).
Loading Fanfold Recording Paper
1Turn on the POWER switch.
2Set the pen lever to the CHART SET (top)
position and lock the lever in place by moving
it to the left.
The platen will be raised, and the pens will automat-
ically move to the far right.
3Hold and shake the recording paper by the
edge to separate the sheets.
4Load the recording paper into the chart holder
with the round holes on the left and the oval
holes on the right.
(Load so that the side of the paper with the red
marks along the edge is on the bottom.)
5Open the chart cover, pass the top of the
recording paper through the opening, and pull
the top edge through.
6Align the paper so that the sprockets engage
the round holes on its left edge.
7In the same way, align the paper so that the
sprockets engage the oval holes on its right edge.
8Close the chart cover.
9Set the pen lever to the UP (middle) position.
The platen will be lowered.
Round
holes
Chart holder
Chart cover
Oval holes
3
4
6,7
Sprockets
2
Pen lever
5
8
Lower the START/STOP/FEED switch to the FEED
position to feed the paper and verify that it has been
properly loaded. You can press and hold the switch in
the FEED position for at least 2 seconds to increase
the feed speed.
9
1

2.2 Loading Recording Paper
15
1
Loading Roll Recording Paper
2
Pen lever
1
Round
holes
Chart holder
Oval holes
3
1Turn on the POWER switch.
2Set the pen lever to the CHART SET (top)
position and lock the lever in place by moving
it to the left.
The platen will be raised, and the pens will auto-
matically move to the far right.
3Load the recording paper into the chart holder
with the round holes on the left and the oval
holes on the right.
4Open the chart cover, pass the top of the
recording paper through the opening, and pull
the top edge through.
5Align the paper so that the sprockets engage
the round holes on its left edge.
6In the same way, align the paper so that the
sprockets engage the oval holes on its right
edge.
7Close the chart cover.
8Set the pen lever to the UP (middle) position.
The platen will be lowered.
Chart cover
5,6
Sprockets
4
7
Lower the START/STOP/FEED switch to the FEED
position to feed the paper and verify that it has been
properly loaded. You can press and hold the switch in
the FEED position for at least 2 seconds to increase
the feed speed.
8
Remaining recording paper
The amount of recording paper remaining (in cm) is indicated on the left edge of the paper.
Red marks will appear on the right side of the paper when there is only about 100 cm of paper left.

2.3 Installing the Pens
16
Use only genuine HIOKI P-1200 series felt pens in the instrument.
2.3 Installing the Pens
Colors: P-1201 (red), P-1202 (green), P1203 (blue)
The letters A through C are appended to the above part numbers depending on the pen type (speed).
(A: standard; B: high-speed; C: low-speed)
See: "Options" (p. 2)
The P-1201A and P-1202A (PR8112 only) pens that ship with the instrument are the standard “A” type.
Use these pens for general recording work.
• If you need to record at a low paper feed speed of 120 mm/h or less…
Use “C” low-speed type pens (P-1201C, etc.) for less running.
• If you need to record at a high speed or want the waveform to dry more quickly…
Use “B” high-speed type pens (P-1201B).
• Be sure to stop pen operation before attempting to install or replace pens. Do not apply
excessive force to the pens during recording. Doing so may damage the instrument.
• After use, recap each pen. Leaving the pens uncovered may cause the pen tip to dry out,
making it impossible to record waveforms.
• Never apply any grease or lubricant to the sliding surfaces of the pen holders and the
enclosure. Doing so could cause a malfunction of the pen operation or damage to the
enclosure.
• Once a pen has run out of ink, developed a thick tip, or grown too short, it cannot be used
anymore. Replace it with a new pen.
• Store unused pens at room temperature, avoiding high temperature and humidity.
• Dispose of used pens in accordance with local regulations.
• Lines drawn with A-type and C-type pens are less prone to dry at a low temperature.
• If ink could bleed through a sheet of fanfold recording paper, use a B-type pen or roll-type
recording paper instead.
Installing Pens and Using the Pen Caps
1Set the pen lever to the UP (middle)
position.
The pens will be raised from the recording
paper.
2Firmly insert the pen as far as it will go
into the pen holder.
Verify that the pen has been inserted as
far as it will go.
3Remove the pen cap and place it on
the pen cap storage pin.
Pull the cap toward you away from the
pen to remove it.
Pen lever
Pen holder
Pen cap storage
pins
1
2
Return the pen caps to the pen tips after
use to keep the pens from drying out.
For the PR881 (2-pen model), the forward (upper) pen holder is CH1, and the rearward (lower) pen holder is CH2.
3
Viewed from side