INSTRUCTION MANUAL

F-109 SURFACE RESISTANCE CHECKER
F-109-1 SURFACE RESISTANCE CHECKER (NO ELECTRODE)
Thank you for purchasing the HOZAN F-109 SURFACE RESISTANCE CHCKER / F-109-1
SURFACE RESISTANCE CHECKER (NO ELECTRODE). With proper care and handling,
this fine instrument will provide years of trouble-free operation. Please read this entire
instruction manual carefully before attempting to place this instrument in service. Pleasekeep this instruction manual available for reference.

Identification of parts and contents
Protective case
Display panel
Code Jack(For monaural plug)

Code Jack(For banana plug)

Code Jack(For banana plug)

Measurement
buttonAccessories
Connection wire(white)

Carrying Case *Ground wire

Connection wire
(gray)
Cloth scale *2 alligator clips

Alkaline battery (6LR61/6LF22)
The battery provided is notwarranted in its life since just atesting battery.
* Included only with F-109

1

Specifications
Body
Measuring range

9.00×10 2  or over, less than 2.00×1012 

Accuracy guarantee range 1.00×10 3  or over, less than 1.00×1012 
Applied voltage
Accuracyswitched
When less than 1.00 x 10 6 ...10 V ± 5%
automatically
When 1.00 x 10 6 or over ...100 V ± 5%
± 10% (± 20% for 1.00 × 1011  or higher) *1
Alkaline battery 6LR61 or 6LF22*Always use alkaline batteries.

Power source
Battery durability

1000 times or more (in constant measurement mode)

Usage environment

60% RH or less (without dew condensation on this machine)

Dimensions

85(W) x 40(H) x 170(D) mm (without projections)

Weight

300 g (without battery)*1 [Reference] RCJS-5-1 Requirements Accuracy used in acceptance test: ± 20%■ Accompanied with the continuous energizing limiter.
When you press the measurement switch, the power turns off automatically in about
35 seconds (about 20 seconds by switching mode).

ElectrodeQuantity

2 piecesDimensions

79 mmȭ 110 mm Conductive pad 63.5 mmȭResistance * 400  or less
Weight2.3 kg (1 piece)* Code Jack - resistance between conductive pads
This product was designed based upon the Japanese standard for ESD measures.

Warning and caution symbols
These symbols are used throughout the instruction manual to alert the user to potential
safety hazards as follows:
Warning … Notice when incorrect handling could cause the user's death or serious
injury.
Caution … Notice when incorrect handling could cause injury to the user or material
damage.
Caution mark, there are some possibilities
Even if the instructions do not havefor a serious situation. Follow the instructions.

2Precautions
Warning
1. Do not touch the electrodes during measurement . This could cause a shock.
2. Do not operate with wet hands. This could cause a shock.
3. Do not plug objects other than the provided connection wires into the jacks on thisdevice. Wiring earphones to listen could not only break the device but also
dangerously damage user’s hearing ability.

Caution
1. This product is for measuring surface resistance of solid matters. Do not use for any
other purpose.
2. Please keep in mind that the power switch may be inadvertently turned on bypushing the measuring switch when turning the main unit upside down. The power
supply automatically turns off in about 35 seconds (about 20 seconds with modeswitching).
3. Note that precise measurement can not done under these conditions;+ The electrodes are soiled.
+ Human bodies are coming into contact with the wires or alligator clips orelectrode.
+ Not in a specified environment.
+ Under noisy environments such as electromagnetic waves
4. Do not disassemble this device. This could cause malfunction.
5. When the device will not used for an extended period, store without the battery.
6. For this is a precision device, avoid strong impact, vibration and high temperature.

Preparation
1 Install the battery. Remove the protective case andremove the 4 screws on the back side, the maincase opens. Connect alkaline batteries (6LR61 /6LF22) correctly.
Press the measuring switch, confirm that thenumerical value is displayed on the display panel,and then attach the main unit case and protective
case in reverse order.

* Please be careful not to touch the board. Touching the board unnecessarily may
cause failure.
* Since this machine consumes large power, be sure to use alkaline dry batteries.
* If the screw is tightened too much, the screw thread may be damaged. Please be
careful with over tightening.

2 Bring it from a place with a low temperature to a place with a high temperature, if

condensation occurs on the main body, wipe out moisture and leave it in themeasurement environment for about 30 minutes before conducting measurement.
We recommend that you leave the object to be measured and this machine in themeasuring environment beforehand and get used to it so that condensation does
not occur.

3

Operation
Measurement of surface (point to point) resistance

1 Connect the electrode.

50 mm or more

250 mmPlease use the attached electrode, alligator clip
according to the measurement application.
Connect the electrode and the code jack of thisunit (for banana plug) with the connection cord(white) and the electrode cord jack (for monauralplug) with the connection cord (gray).

2 Using the attached scales, place the electrodes
at the specified distance and perform themeasurement.

Go to the right page(Reference)
Standard RCJS-5-1
Electrode distance 250 mm
Place the electrode at 50 mm or more away from the sample end

Measure the resistance (ground-to-ground resistance between EPA)
between the groundable connection points

1 Connect the electrode.

Please use the attached electrode, alligator
clip according to the measurement application.
Connect the electrode and the code jack ofthis unit (for banana plug) with the connection
cord (white) and the electrode cord jack (formonaural plug) with the connection cord (gray).

2 Connect the alligator clip to the ground point.
Using a cloth scale, place the electrode at a
specified distance from the grounding point
and perform measurement.

50 mm or more

50 mm or more

Tool measurement example
Tool
Insulator

Go to the right page(Reference)
Standard RCJS-5-1
Distance between ground point and electrode
50 mm or more
Place the electrode at a distance of 50 mm ormore from the sample end or grounding point

4

By using optional item F-102 / F-103,
measurement of clothes and shoes
is also possible.

Operation
3 When you press and hold the measurement switch(0.5 sec or more), the resistance value is displayedon the display and measurement starts.

When 10 V is applied

When the object is less than 1 × 106 , the applied
voltage is 10 V, and when the object is 1 × 106 or more, the applied voltage becomes 100 V, oneof the marks will light up.
It turns off automatically after 35 seconds have elapsed.

When 100 V is applied

The standard stipulates to read the measured value
after 15 seconds. It is also possible to hold themeasured value after 15 seconds according to thestandard (see page 7).
When the resistance value is outside the measurement range,
it is displayed as shown below.
When 9.00 × 102  or less, "9.00 × 102 " indication flashes.
When it is 2.00 × 1012  or more, "2.00 × 1012 " indication flashes.
Since high resistance measurement (109 to 1010  or more) measures a weakcurrent, it is susceptible to ambient noise influences, and external factors such as
noise elements may be included in the measurement result.
If highly accurate measurements such as calibration are required, measure after
measures on the next page.

Warning
Do not touch the electrodes during measurement. There is a danger of electric
shock. Especially when you touch the electrode after pushing the measurement
button, 100 V may be applied, which is extremely dangerous.

Caution・(Bat) and measurement value blink alternately,
battery life is reached.
If the display blinks or the measured value is not displayed, replace the battery
with a new one and perform measurement again. An accurate measurement
result can not be obtained unless the battery is exhausted and it is below therated voltage of this unit.

・ Do not touch the cord / electrode / alligator clip during measurement. The
equipment may be affected and accurate measurement may not be performed.
・ If lateral force is applied to the plug by tensioning the cord strongly, contact
failure will occur. Leave the cord lightly and measure it.

5Operation【Countermeasure】
In order to remove noise elements, measures should be taken after countermeasuresagainst shielding, such as surrounding the object to be measured with a metal casing.

ToolShield

Insulator

If the numerical value still does not stabilize, connect the attached ground wire to theshield part of the object to be measured, and set the shield part of the target and themeasuring object to the same potential. (3 terminal measurement)
Attached earth
wire

Please insert the earth wire
terminal through the monauralplug and insert it tightly until
the terminal touches the metalof the jack.

【About daily management】
If it is difficult to measure in an environment where the noise environment has been
removed, such as on-site daily management, it is necessary to measure (preliminaryevaluation) in a noise-free environment before using the ESD protection product, Please
perform measurement before starting use.
(The measured value will change depending on the influence of humidity, temperature,etc. Please adjust the measurement conditions as much as possible.) If the humidity
exceeds 60%, measurement results within the accuracy range will not be obtained.
If the measurement results of both are different, it can be inferred that the difference isan external factor such as a noise factor.
In daily inspection, we recommend that you manage this considering the difference.

6

About measurement mode
Measurement mode can be switched by mode switch.
The following constant measurement mode is set at shipment.
<Always measuring mode>
The measured value is displayed at all times.
It automatically turns off in 35 seconds from the start of measurement.
<Measurement value hold mode>
Fixed the measurement value after 15 seconds from the start of measurement, turn OFF
after displaying for 5 seconds.
The current mode can be confirmed with the 15 S mark.
Always measuring mode ... Not displayed.
Measurement value hold mode ... Displays for 15 seconds from power on.
Display panel - Always measuring mode

Display panel - Measured value hold mode

When the object to be measured is high resistance (× 1010 to 1011  or more), it takes
time to stabilize the measured value.
Because measured values may not be stabilized within 15 seconds, we recommend you
to use in constant measurement mode when measuring high resistance.
Measurement value When using hold mode, please measure twice or more and adopt
later measurement result.
When the object to be measured is in the vicinity of the switching point of applied voltage(around 1.00 x 106 ), the applied voltage may go back and forth between 100 V / 10 V
and the measurement result may not be stabilized.
In this case, please adopt measurement result narrowed down to either applied voltage.
Measurement value In the hold mode, it is sometimes fixed as a result of an unintendedapplied voltage, so we recommend using it in the continuous measurement mode.
How to switch measurement mode
Remove the protective case and remove the 4 screws
on the back side, the main case opens.
When the switch at the upper right of the battery box
is tilted to the left, it is always in measurement mode,
and when it is tilted to the right, it enters measurement
value hold mode.
After switching, install the main unit case and theprotective case in reverse order.

7

Selector switch
Alwaysmeasuring

Hold ᴾOn compatibility of electrode device to standard
About external dimensions
Although the external dimensions are
79 mmφ × 110 mm, the conductive padin contact with the object to be measured is63.5 mmφ and conforms to the standard.
On the resistance of the electrode device
RCJS-5-1 stipulates that "the inter-point r
esistance between two probes must havesufficient conductivity so that it is lower
than 103 Ω".
For our products, the resistance perelectrode (between the cord jack and theconductive pad) is 400 Ω or less, and theresistance of the circuit as shown in thefigure is 800 Ω or less.
About weight
Weight 2.3 kg (1 piece) conforms to thestandard 2.5 kg ± 0.25 kg.

63.5 mmφᴾ

F-101

F-101

400 Ω or less 400 Ω or less
Metal plate (approximately ᴾ0 Ω)

Surface resistancemeter included code Below 103 Ω
Surface Resistance Checker

Maintenance and calibration
・ When the electrode becomes dirty please wipe gently with alcohol etc.
Do not use thinners, benzine, etc.
・ We also have calibration certificate attached (F-109-TA, F-109-1-TA).
Please re-calibrate after use for a certain period through our purchase store.

1-2-12 Saiwaicho, Naniwa-ku, Osaka 556-0021, Japan
https://www.hozan.co.jp/E/
E-mail：th@hozan.co.jp

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