Hioki FT4310 Bypass Diode Tester
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.
How to Use the Hioki Bypass Diode Tester FT4310
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.
Features Hioki FT4310 Bypass Diode Tester
- 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)
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, you can detect for open faults even when the sun is out without covering the panels.
Testing can also be performed at night.
Test for bypass diode open faults and other malfunctions using the strings in junction boxes
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.
Save time – simultaneously measure all electrical parameters
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)
Instantly create reports by a free app (GENNECT Cross)
GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports.
The software provides a range of functionality that helps manage data in the field, including photographing measurement sites, placing measurement results on photographs, and saving hand written memos.
Be alerted to faults with an audible warning and by the instrument’s backlight
Red backlight and audible warning alert the user to possible faults.
Ex) Open fault (Using BPD TEST mode)
RBPR：The instrument indicates the open state (“opn”)
High-precision voltmeter ideal for detecting short-circuit faults
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.
[Reference] Issues caused by faulty bypass diodes
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.
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.
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.
Specifications Hioki FT4310 Bypass Diode Tester
[BPD TEST mode]
|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)
Countries and regions where wireless operation is currently supported (FT4310)
|Countries and regions where wireless operation is currently supported||Australia, Austria, Bangladesh, Belgium, Bulgaria, Canada, Chile, China, Colombia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy, Japan, Kenya, Latvia, Liechtenstein, Lithuania, Luxembourg, Macao, Malta, Myanmar, Netherlands, Norway, Peru, Poland, Portugal, Romania, Singapore, Slovakia, Slovenia, Spain, Sweden, Switzerland, Thailand, Turkey, United Kingdom, United States, Viet Nam|
|Note||Use of devices that emit radio radiation requires approval in the country of use. Thus, use of the instrument in a country or region where they have not been approved may be subject to penalty as a violation of law.|
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