Micsig SigOFIT MOIP01P SigOFIT MOIP01P User manual

SigOFITTM
Optical-fiber Isolated Probe
USER MANUAL
Version: V2.3
Shenzhen Micsig Technology Co. Ltd

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Preface
The information provided in this document is provided "as is" and is subject to change without notice in future
editions. Further, to the fullest extent permissible pursuant to applicable law, Micsig disclaims all warranties,
express or implied, with respect to this manual and any information contained herein, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose. Micsig shall not be liable for errors or
for incidental or consequential damages arising out of the furnishing, use or application of this document or any
information contained herein.
If a separate written agreement has been entered into between Micsig and the User that contains warranty
provisions covering the contents of this document and the warranty provisions conflict with those provisions, the
warranty provisions in the separate agreement shall prevail.
Contact Information
Shenzhen Micsig Technology Co., Ltd.
Tel: [phone]
Email: [e-mail]
Address: 1F, Building A, Huafeng International Robot Industrial Park, Hangcheng Avenue, Baoan District,
Shenzhen, Guangdong, China, 518126

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Warranty
Micsig warrants that this product will be free from defects in materials and workmanship for a period of one (1)
year from the date of shipment. If any such product proves defective in materials or workmanship during this
warranty period, Micsig, at its option, either will repair the defective product without charge for parts and labor, or
will provide a replacement in exchange for the defective product. Parts, modules and replacement products used by
Micsig for warranty work may be new or reconditioned to like new performance. All replaced parts, modules and
products become the property of Micsig.
Standard accessories are NOT covered in main body warranty.
The bending radius of the optical isolation probe must not be less than 8cm, otherwise it will lead to fiber
breakage. Damage to the fiber cable is NOT covered by the warranty.
The warranty will be void in the following cases, but repair services are provided free of labor charges and only
parts are charged:
a. Damage to any accessory caused by improper use, maintenance, or storage by the consumer.
b. Damage caused by force majeure factors, such as natural disasters, etc.
Micsig will refuse to provide repair service or provide repair service for a fee in the following cases:
a. Unable to provide product packaging or anti-counterfeit labels on product packaging.
b. The content of the security label is altered, or blurred and unrecognizable.
c. Disassembled by any person not authorized by Micsig. (e.g., changing wires, disassembling internal
components, etc.)
d. No sales voucher or sales voucher content does not match the product.

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Catalog
WARRANTY ...............................................................................................................................................................................3
GENERAL SAFETY SUMMARY...........................................................................................................................................5
MAINTENANCE SAFETY SUMMARY ...............................................................................................................................6
COMPLIANCE INFORMATION ...........................................................................................................................................7
ENVIRONMENTAL NOTES .......................................................................................................................................................................... 8
INTRODUCTION.......................................................................................................................................................................9
PROBE DESCRIPTION......................................................................................................................................................... 10
OPTICAL-ELECTRICAL CONVERTER...................................................................................................................................................... 10
ELECTRICAL-OPTICAL CONVERTER...................................................................................................................................................... 11
E-O CONVERTER ATTENUATING TIPS.................................................................................................................................................... 11
PRECAUTION REQUIREMENTS...................................................................................................................................... 13
MEASUREMENT SYSTEM PRECAUTIONS .............................................................................................................................................. 13
ENVIRONMENTAL REQUIREMENTS ........................................................................................................................................................ 14
SAFETY REQUIREMENTS .......................................................................................................................................................................... 14
INSTALLATION ........................................................................................................................................................................................... 16
OPERATION STEPS..................................................................................................................................................................................... 16
AUTO CALIBRATION AND MANUAL ZERO ............................................................................................................................................ 17
TECHNICAL SPECIFICATIONS ....................................................................................................................................... 18
MAINTENANCE SERVICE ................................................................................................................................................. 22
TROUBLESHOOTING.................................................................................................................................................................................. 22
MAINTENANCE .......................................................................................................................................................................................... 22
ORDERING INFORMATION .............................................................................................................................................. 23
MODELS ...................................................................................................................................................................................................... 23
STANDARD ACCESSORIES ....................................................................................................................................................................... 23
AFTER SALES SERVICE / SERVICE SUPPORT........................................................................................................... 25

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General Safety Summary
Please read the following safety precautions carefully to avoid personal injury and to prevent damage to this product
or any equipment connected to this product.
To avoid possible hazards, be sure to use this product in accordance with the regulations.
Products are only available to personnel with relevant technical training.
To avoid fire or personal injury
Connect and disconnect the equipment properly.
• Only use the testing wires and accessories that are provided with the product or specified by Micsig.
• Before connecting the probe to the circuit under test, connect the probe output terminal to the oscilloscope.
• When connecting to the powered circuits recommended in this manual, maintain a safe distance from the
power-optical converter and attenuator.
• Disconnect the power to the circuit under test before connecting or disconnecting the probe.
• Before disconnecting the probe from the oscilloscope, first disconnect the probe input terminal from the circuit
under test.
Observe all terminal ratings.
To avoid fire or shock hazard, observe all rating and markings on the product. Consult the product manual for
further ratings information before making connections to the product. Do not apply a potential lowest that exceeds
the maximum rating.
Do not operate without covers.
Do not operate this product with covers or panels removed. Hazardous voltage exposure is possible.
Do not operate with suspected failures.
If you suspect that there is damage to this product, have it inspected by qualified service personnel.
Disable the product if it is damaged. Contact Micsig's designated service personnel to conduct the inspection.
Avoid exposed circuitry. Do not touch exposed connections and components when power is present.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Clean with a dry cloth only.
Terms in this manual.
The following terms may appear in this manual:
Warning: Indicating conditions or practices that could result in injury or loss of life.
CAUTION: Indicating conditions or practices that could result in damage to this product or other property.

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Maintenance Safety Summary
Only qualified maintenance personnel with the relevant qualifications may perform maintenance operations. Please
read the "Maintenance Safety Summary" and "General Safety Summary" before performing any maintenance
operations.
Do not make repairs alone: Do not make internal repairs or adjustments to this product unless there is someone on
site who can provide first aid and resuscitation measures.
Disconnect the power supply: To avoid electric shock, disconnect the power supply of the equipment first, and
then disconnect the power cord from the main power supply.
Caution when servicing with electricity: Dangerous voltages or currents may be present in this product.
Disconnect the power and test leads before removing the protective panel and performing soldering or component
replacement.
To avoid electric shock, do not touch the exposed connectors.

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Compliance Information
This section lists the Safety and Environmental standards with which the instrument complies. This product is
intended for use by professionals and trained personnel only; it is not designed for use in households or by children.
Equipment type
Test and measuring equipment.
Pollution level description
A measure of the contaminants that could occur in the environment around and within a product. Typically, the
internal environment inside a product is considered to be the same as the external. Products should be used only in
the environment for which they are rated.
• Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in this category are
generally encapsulated, hermetically sealed, or located in clean rooms.
• Pollution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity
that is caused by condensation must be expected. This location is a typical office/home environment.
Temporary condensation occurs only when the product is out of service.
• Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to
condensation. These are sheltered locations where neither temperature nor humidity is controlled. The area is
protected from direct sunshine, rain, or direct wind.
• Pollution Degree 4. Pollution that generates persistent conductivity through conductive dust, rain, or snow.
Typical outdoor locations.
Pollution degree rating
Pollution degree 2.
Overvoltage category descriptions
The overvoltage category is classified according to IEC60664 standard and is divided into four classes CAT I, CAT
II, CAT III and CAT IV.
 Category I. Circuits not directly connected to a mains supply.
 Category II. Circuits directly connected to the building wiring at utilization points (socket outlets and similar
points).
 Category III. In the building wiring and distribution system.
 Category IV. At the source of the electrical supply to the building.
Overvoltage category
Overvoltage category II

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Environmental Notes
This section provides information about the environmental impact of the product.
Product end-of-life handling
When recycling instruments or components, observe the following guidelines:
Equipment Recycling: Production of this equipment required the extraction and use of natural resources. The
equipment may contain substances that could be harmful to the environment or human health if improperly handled
at the product’s end of life. To avoid release of such substances into the environment and to reduce the use of
natural resources, we encourage you to recycle this product in an appropriate system that will ensure that most of
the materials are reused or recycled appropriately.
This symbol indicates that the product complies with the relevant requirements of the EU
Directives 2012/96/EC and 2006/66/EC on Waste Electrical and Electronic Equipment (WEEE)
and Batteries.

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Introduction
The Micsig SigOFITTM optical-fiber isolated probe offers a galvanically isolated measurement solution for
accurately resolving high bandwidth, high voltage differential signals in the presence of large common mode
voltages with the excellent common mode rejection capability within its bandwidth range.
Key Features:
 Exclusive SigOFIT ™ optical isolation technology, common mode voltage up to 85kVpk.
 Differential voltages range 100mV-5000Vpk (attenuating tip dependent)
 CMRR up to 128dB at 100MHz and up to 108dB at 1GHz
 1% accuracy at DC Gain, 1.5% accuracy within effective bandwidth range
 Fast response, calibration in 1 second, delivers accurate signal output in real time
Applications:
 Power device evaluation, current parallel measurement, EMI and ESD troubleshooting
 Motor drive design, power converter design, electronic ballast design
 Design and analysis of GaN, SiC, IGBT half/full bridge devices
 Tests of inverters, UPS and switching power supplies
 Safety isolation test for high voltage, high bandwidth applications
 Wide voltage, wide band test applications
 Floating measurements

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Probe description
Optical-Electrical Converter
The Optical-Electrical Converter (O-E Converter hereafter) can restore the optical signal transmitted by the
Electrical-Optical converter (E-O Converter hereafter) to an electrical signal and input to the oscilloscope. The
buttons on the O-E converter are to control the probe and the LEDs indicate the operating status of the probe.
Optical-Electrical Converter (O-E Converter)
Button Description:
Button: Cali. (on MOIP01P, MOIP02P, MOIP03P only)
Short press to start Auto calibration, calibration time is usually less than 1 second, no need to wait. During
calibration, no need to disconnect the test connection. LED will flash during calibration, the buzzer sounds one
time indicates a successful calibration, three times indicates a failed calibration, press Cali. button again if failed.
Button : "△" & "▽" (on MOIP01P, MOIP02P, MOIP03P)
Manually adjust the Zero point (normally no adjustment is required).
Button: Gain (on MOIP05P, MOIP08P, MOIP10P only)
Short press “Gain” to switch between 0dB and 20dB. The attenuation factor of the attenuator is not fixed, the
corresponding attenuation factor needs to be set according to the indicator light.
Over-voltage Alert
When Gain (Power) button flashes rapidly and hearing a rapid "DiDiDiDi..." buzzer sound, it means the input
voltage is out of range, please select a suitable attenuating tip.
Over-heating Warning:
When hearing a “DiDi" sound every 2 seconds, it means the temperature of the Optical-Electrical (O-E)
converter is overheated, please check whether the dissipation port is blocked.
▲Button panel of MOIP01P, MOIP02P, MOIP03P ▲ Button panel of MOIP05P, MOIP08P, MOIP10P

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Electrical-Optical Converter
The Electrical-Optical (E-O) converter converts the electrical signal from device under test into an optical signal
and transmits it via optic fiber to the Optical-Electrical (O-E) converter.
The E-O converter of SigOFIT probe is powered over fiber, no additional power supply required.
Electrical-Optical Converter
E-O converter attenuating tips
Attenuating tip options on E-O converter end:
Photo
Description
Model name
Attenuation ratio of 10:1
OP10
Attenuation ratio of 20:1
OP20
Attenuation ratio of 50:1
OP50
Attenuation ratio of 100:1
OP100
Attenuation ratio of 200:1
OP200
Attenuation ratio of 500:1
OP500
Attenuation ratio of 1000:1
OP1000
Attenuation ratio of 2000:1
OP2000
Attenuation ratio of 5000:1
OP5000
Install the attenuating tip
As shown in the figure below, screw the attenuating tip into the E-O converter end till firmly tightened.

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How to choose an attenuating tip:
Caution: Please select proper attenuating tip for the measurement to avoid damage to the Electrical-Optical
converter or degradation of performance due to over-voltage. Please select the attenuating tip with possible
lowest attenuation ratio allowed by the tested signal range.
The attenuating tip should be selected based on the peak voltage (or rms voltage) of the signal under test.
Please refer to the technical specifications to select the appropriate attenuator.

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Precaution requirements
Measurement System Precautions
SigOFIT probe contains high quality components and should be handled with care to avoid damage or degradation
of performance due to improper handling. Please consider the following precautions when handling fiber optic
cable and electrical-to-optical converter end connections:
 DO NOT excessively bend fiber-optic cable. Avoid tight radius (＜8cm) bends, crushing, crimping,
twisting, pulling or otherwise stressing cables.
 DO NOT block the heat dissipation port on the Optical-Electrical converter (or O-E Converter),
otherwise the probe may be overheated and damaged.
 Do not put heavy objects on the fiber cable, such as running over with a chair.
 When disassembling and moving the probe, please hold the converter body by hand, do not lift or drag the
cable.
 Accidental drop of the E-O or the O-E converter may result in damage to internal optical components.
 Please check damage to the fiber cable, (as shown below) please stop use when there is damage to the flexible
braided cable or the soft rubber sheath.
 When not in use, store the SigOFIT probe in its factory fitted carrying case.

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Environmental requirements
Features
Status
Environmental requirements
Temperature
Working
Optical-Electrical converter: 0° C ~ +40° C
Electrical-Optical converter: 0° C ~ +40° C
Non-working
Optical-Electrical converter: -20° C ~ +70° C
Electrical-Optical converter: -20° C ~ +70° C
Humidity
Working
Optical-Electrical converter: 5% to 85% RH (relative humidity) below +30° C, non-
condensing
Electrical-Optical converter: 5% to 85% RH (relative humidity) below +40° C; 5%
to 45% RH at +40° C ~ +50° C, non-condensing
Non-working
Optical-Electrical converter: 5% to 85% RH below +40° C; 5% to 45% RH at +40°
C ~ +85° C, non-condensing
Electrical-Optical converter: 5% to 85% RH below +40° C; 5% to 45% RH at +40°
C ~ +85° C, non-condensing
Altitude
Working
3000 meters
Non-working
12,000 meters
Safety requirements
The high common-mode voltage range of SigOFIT optically isolated probe can be applied to measurements where
high-frequency and high-voltage common-mode signals are present. Please read and understand all precautions
when measuring with this product.
Warning: Electric shocks may occur when using this measurement system. The system is used to isolate the
personnel from dangerous input voltages (common voltage); the plastic housing of the Electrical-Optical converter
and the shielding of the attenuator do not provide safe isolation.
Keep a safe distance from the Electrical-Optical converter and the attenuator when the measurement system is
connected to an energized circuit as recommended in this manual.
Safe distance from electro-optical converters and attenuators when measuring high-voltage common-mode
signals:
Common model voltage (AC)
10kV or below
10 kV ~ 35 kV
>35 kV
Safe distance
>0.7m
>1m
>1.5m

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Warning: Do not disassemble the electrical-optical converter or the optical-electrical converter. They contain a
laser source which may result in laser exposure.
Warning: To avoid the risk of electric shock, do not connect the measurement system directly to an energized
circuit. Always disconnect the test circuit before installing or removing the attenuating tip from the test circuit. The
plastic housing the converter and the shielded end of the attenuator do not provide isolation.
Warning: To avoid the risk of electric shock or RF burn when the circuit under test is energized, do not touch
the electrical-optical converter and its attenuator while testing. Always maintain a distance of 1 meter or more from
the electrical-optical converter during the test. Be sure to review the instrument's maximum ratings and derating
curves for more information on RF burn areas.
Warning: To avoid possible damage to the device, do not connect the probe of the electrical-optical converter
connection to a high impedance part of the circuit. Additional capacitance may cause damage to the circuit. Please
connect the probe connected to the electrical-optical converter to the low impedance part of the circuit. Note:
Touching the electrical-optical converter or attenuator while measuring high frequency common mode signals will
increase capacitive coupling and may reduce the common mode loading of the test circuit.
Warning: To prevent arc flash caused by different potentials, do not place the electrical-optical converter end
attenuator in a circuit with different voltages.

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Installation
Operation Steps
1. Connect the optical-electrical converter to the oscilloscope;
2. Set the oscilloscope input impedance to 50 Ω, set the corresponding attenuation ratio and delay time;
3. Connect the attenuating tip to the electrical-optical converter;
4. Power the SigOFIT probe by connecting USB-C cable to O-E Converter using standard charger (localized),
the E-O Converter will be powered on automatically, vice versa, when the O-E converter powered off, the E-
O converter will be powered off simultaneously.
5. Solder the MCX / MMCX adapter to the test board.
Notice:
1) When testing Vgs signal, the signal pin (in the middle) of the MCX / MMCX adapter must be connected to the
G end of the MOSFET;
2) Solder the MCX / MMCX adapter directly to the test point, try NOT to use extension lead, it may bring
unsatisfactory test results.
3) For easy soldering, suggest to cut three of the four ground pins around the base (Figure below), just keep one.

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6. Plug the attenuating tip to the MCX / MMCX adapter;
7. Power ON the test board;
8. Adjust the oscilloscope settings and proceed test;
Auto calibration and manual Zero
The SigOFIT probe has auto-calibration and Zero function that automatically corrects the gain accuracy. Always
press Cali. button to get better results before get final test readings. No need to disconnect the circuit during
calibration. Auto calibration can be completed in 1 second.
The "△" and "▽" buttons on the MOIP01P, MOIP02P, and MOIP03P can be used to manually adjust the Zero
point, and generally no adjustment is required;
The MOIP05P, MOIP08P, and MOIP10P can be automatically calibrated right after power on, no need extra
manual calibration.

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Technical Specifications
All technical specifications are typical values unless otherwise indicated.
Technical specifications are valid when:
Probe is calibrated at 23°C ±5°C ambient temperature
Probe is powered by normal power supply
The temperature, altitude, and humidity of the environment in which the probe is located cannot exceed the
limits of the stated environmental requirements.
Electrical Characteristics
Model &
Ordering Name
MOIP01P
MOIP02P
MOIP03P
MOIP05P
MOIP08P
MOIP10P
Bandwidth
100MHz
200MHz
350MHz
500MHz
800MHz
1GHz
Rise time
≤3.5ns
≤1.75n
≤1ns
≤700ps
≤438ps
≤350ps
CMRR
DC: 180dB
100MHz: 128dB
DC: 180dB
200MHz: 122dB
DC: 180dB
350MHz: 118dB
DC: 180dB
500MHz: 114dB
DC: 180dB
800MHz: 110dB
DC: 180dB
1GHz: 108dB
Output Voltage Range
±2.5V
±2.5V
±1.25V
±500mV
±500mV
±500mV
Noise
<1.46mVrms
<450μVrms
Propagation delay
15.42ns (2m fiber length)
16ns (2m fiber length)
Power supply
DC: 9-12V
DC Gain accuracy
1%
Common mode
voltage range
85kVpk
Fiber cable length
2m (Customizable)
Temperature
0°C to 40°C (operating), -20°C to +70°C (non-operating)
Humidity
5% to 85% RH (non-condensing), 75% RH above 30°C, 45% RH above 40°C
Altitude
3000 m (operating), 12,000 m (non-operating)
Usage
Indoor Use Only
Package size
37*11*32.5 cm
Package GW
2.2KG

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Attenuating tips
SigOFIT model
Atten. Tip model
Attenuation ratio
Voltage range
Non-destructive
voltage (Max.)
Input impedance
MOIP01P &
MOIP02P
MMCX OP10-2
10:1
±25V
1500Vpp
10MΩ || 2.5pF
MMCX OP20-2
20:1
±50V
1500Vpp
9.47MΩ || 2pF
MCX OP500-2
500:1
±1250V
2500Vpp
12.28MΩ || 1pF
MCX OP1000-2
1000:1
±2500V
3000Vpp
12.28MΩ || 1pF
MOIP03P
MMCX OP20-5
20:1
±25V
1500Vpp
9.47MΩ || 2pF
MCX OP50-5
50:1
±62.5V
1500Vpp
9.47MΩ || 2pF
MCX OP1000-5
1000:1
±1250V
3000Vpp
12.28MΩ || 1pF
MCX OP2000-5
2000:1
±2500V
4800Vpp
30MΩ || 1pF
MOIP05P
MMCX OP20-5
20:1 @0dB
±10V
1500Vpp
9.47MΩ || 2pF
2:1 @20dB
±1V
MMCX OP50-5
50:1 @0dB
±25V
1500Vpp
9.47MΩ || 2pF
5:1 @20dB
±2.5V
MCX OP1000-5
1000:1 @0dB
±500V
2500Vpp
12.28MΩ || 1pF
100:1 @20dB
±50V
MCX OP2000-5
2000:1 @0dB
±1000V
3000Vpp
12.28MΩ || 1pF
200:1 @20dB
±100V
MCX OP5000-5
5000:1 @0dB
±2500V
4800Vpp
30MΩ || 1pF
500:1 @20dB
±250V
MOIP08P &
MOIP10P
MMCX OP20-1G
20:1 @0dB
±10V
1500Vpp
9.47MΩ || 2pF
2:1 @20dB
±1V
MMCX OP50-1G
50:1 @0dB
±25V
1500Vpp
9.47MΩ || 2pF
5:1 @20dB
±2.5V
MCX OP1000-1G
1000:1 @0dB
±500V
2500Vpp
12.28MΩ || 1pF
100:1 @20dB
±50V
MCX OP2000-1G
2000:1 @0dB
±1000V
3000Vpp
12.28MΩ || 1pF
200:1 @20dB
±100V
MCX OP5000-1G
5000:1 @0dB
±2500V
4800Vpp
30MΩ || 1pF
500:1 @20dB
±250V

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Mechanical characteristics
Characteristics
Parameters
Optical-Electrical (O-E)
converter size
9.8 x 4.5 x 2.1 cm
Electrical–Optical (E-O)
converter size
11 x 4 x 2.3 cm
Optical cable length
2m
Adapters and coaxial lead
Accessory type Withstand voltage range
MCX adapter ＜3000Vpp
MMCX adapter ＜300Vpp
MCX coaxial lead ＜3000Vpp
MMCX coaxial lead ＜300Vpp