BYPASS DIODE TESTER
Inspect solar panel bypass diodes for opens and shorts in broad daylight without covering panels
Traditionally, bypass diodes can only be inspected for good working condition at night or when power is not being generated by the solar panels in order to verify that any applied current is guided past the solar cells. With the FT4310 Bypass Diode Tester, you can detect for open faults even when the sun is out without covering the panels. Also test for short-circuit faults and cell string losses. Key Features • Test for open or short-circuit bypass diodes even during the day*1 • Easily test using the strings in the junction boxes*2 • Save time - simultaneously measure all electrical parameters*3 • Automatically transfer data wirelessly (Available for Android and iOS devices*4) *1 Testing can also be performed at night. Testing for short-circuit faults can only be performed during the day. *2 There is no need to climb onto the roof and dramatically improving work efficiency. *3 Measure open-circuit voltage, short-circuit current, and bypass route resistance and display all three values at once. *4 Automatically transfer data with Bluetooth® wireless technology Data can be downloaded to tablets and smartphones using Hioki’s dedicated apps available from the Google Play or App Store. Search for “HIOKI” and download the “GENNECT Cross” app. *Android, Google Play and the Google Play logo are trademarks of Google Inc. *iOS is a registered trademark of Cisco Technology, Inc. and/or its affiliates in the United States and certain other countries. *iPhone, iPad, iPad mini, iPad Pro and iPod touch are trademarks of Apple Inc. *Apple and the Apple logo are trademarks of Apple Inc. App Store is a service mark of Apple Inc. *Microsoft, Windows, Windows Vista, and Excel are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. *Company names and Product names appearing in this catalog are trademarks or registered trademarks of various companies. *The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by HIOKI E.E. CORPORATION is under license. *For the latest information about countries and regions where wireless operation is currently supported, please visit the Hioki website.
The FT4310, a bypass diode tester ideal for maintaining solar power systems, can detect open faults and short faults during daylight hours without the need to cover the solar panels. Watch this video to see how it can be easily and conveniently used in the field.
Traditionally, bypass diodes can only be inspected for good working condition at night or when power is not being generated by the solar panels in order to verify that any applied current is guided past the solar cells. With the FT4310, you can detect for open faults even when the sun is out without covering the panels. Testing can also be performed at night. *Testing for short-circuit faults can only be performed during the day.
Easily test using the strings in the junction boxes, eliminating the need to climb onto the roof and dramatically improving work efficiency. *Disconnect the string being measured from the interconnect prior to measurement.
Simply set the rotary knob to “BPD TEST” and press the “Measure”button to measure and display all parameters necessary for fault identification (open-circuit voltage, short-circuit current, and bypass route resistance). Measurement takes 2 sec. or less per string! RBPR: Bypass route resistance value Voc: Open-circuit voltage value Isc + α1: Measuring current value Isc: Short-circuit current value Judgment: Presence of a bypass diode open fault (when set to comparator, judgment based using RBPR value as well)
Measured values held on the display are sent immediately to a smartphone or tablet via Bluetooth (R) wireless technology. Save date in CSV or PDF format. Eliminate the need to take notes - particularly useful at sites with a large number of test points. *Available for Android and iOS devices *Use with the dedicated Hioki GENNECT Cross app
When a bypass diode experiences a short-circuit fault, the output voltage decreases (by about 10 V) because the corresponding solar panels are not contributing to the array’s generated power. By detecting this difference, it is possible to detect bypass diode short-circuit faults and cell string losses. The FT4310 incorporates a high-precision DC voltmeter so that it can detect a voltage difference of 10 V in a 1000 V system. When used in Voc mode, which is specifically designed to measure open-circuit voltage, the instrument displays the voltage difference in less than 1 sec. and tests for a short-circuit fault.
● Bundled case with neck strap Leave both hands free so you can precisely position test probes without worrying about dropping the instrument. ● Integrated "hold" button right on test leads A button right at your fingertip on the test leads lets you hold measured values easily, eliminating the need to operate a control on the instrument itself. They also incorporate a handy light.
Normal reading: When a solar panel is obscured by a partial shadow (or when it fails), the current bypasses the panel in order prevent any drop-off in generating efficiency. Short-circuit fault: When a short-circuit fault occurs, the generated current flows in a loop, making it impossible to capture the generated power, resulting in lowered efficiency. Open fault: When an open fault occurs, current is forced to flow to the defective cell when it’s covered by a shadow, causing the panel to heat up and posing the risk of fire.
The impact of measurement on strings has been investigated thoroughly since even if bypass diode open faults can be detected while solar panels are exposed to sunlight, the endeavor would be pointless if the panels were damaged in the process. When the FT4310’s measurement button is pressed, the instrument first measures ISC (the short-circuit current) and then applies a voltage such that a current that is 1 A greater than ISC flows. Because bypass diodes are required by the JIS to function without issue even if a current equal to 1.25 times the module’s rated short-circuit current flows for a period of one hour, because the FT4310 performs constant-current control, and because the time of application is 5 ms or less, the FT4310’s impact on strings does not differ from that of I-V curve measurement or insulation resistance measurement. The FT4310 can be used with confidence that it will not damage solar panels.
|Measurement items||Open-circuit voltage, Short-circuit current, Bypass route resistor|
|Measurement items||Bypass diode comparator judgment, Bypass route resistor, Open-circuit voltage, Short-circuit current, Measurement (applied) current|
|Measurement object||Crystal system string|
Open-circuit voltage: 1000 V DC or less, Rated current: 2 A to 12 A DC
|Measurement method||Short-circuit and pulse voltage application|
|Measurement accuracy||Open-circuit voltage: ±0.2% rdg. ±3 dgt. (at 0 to ±1000 V)|
Short-circuit current: ±3% rdg. ±3 dgt. (at 0.0 to 15.0 A)
Bypass route resistance: ±5% rdg. ±5 dgt. (at 0.0 to 15.0 Ω, During pure
|Measurement time||2 s or less (3 seconds or less when measurement voltage is 10 V or less)|
|Possible number of measurements||3000 times (Comparator, backlight, Bluetooth® OFF)|
LR6 Alkaline battery × 6
|Measurement items||Open-circuit voltage|
|Measurement range||0 V to 1000 V DC (Displayed up to 1200 V DC), Accuracy: ±0.2% rdg. ±3 dgt.|
|Response time||Within 1 sec.|
|Dustproof and waterproof||IP40 (EN60529)|
|Functions||Displays the number of bypass diode measurements, Automatic polarity judgment|
function, Comparison display, Auto hold, Live circuit indicator, Buzzer sounds,
Backlight, Comparator, Battery indicator, Auto power off, Bluetooth® Smart
|Interface||Bluetooth® 4.0LE, Supports devices: iOS, Android TM smartphone/ tablet|
|Power supply||LR6 (AA) alkaline battery×6, Maximum rated power 18 VA|
Continuous operating time: 45 hours (Comparator, backlight, Bluetooth® OFF)
|Dimensions and mass||152W×92H×69D mm (5.98 W × 3.62 H × 2.72 D in)|
650 g (22.9 oz) (including batteries, excluding test leads)
|Wireless certification||Japan, United States, Canada, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom, and Chile|
|Exempt from wireless regulations||Viet Nam, Hong Kong, Macao, India, Russian Federation, Colombia, Pakistan, Vanuatu, and Peru|
Hioki offers members manuals and other technical documentation.
The documents are available for download on your myHIOKI page.
|Catalog: BYPASS DIODE TESTER FT4310||Download PDF [3MB]||
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The L9788-11 is bundled, others are exclusive options for L9788-11
TEST LEAD WITH REMOTE SWITCH (RED) L9788-10
TEST LEAD SET WITH REMOTE SWITCH L9788-11
TIP PIN L9788-90
BREAKER PIN L9788-92
*The C0206 is bundled
CARRYING CASE C0206
No results were found.