Fluke 125B/NA/S
40 MHz 2 Ch, 40 MS/s Scopemeter, Hand-Held Oscilloscope with Bus Health and SCC Kit

  • Dual-input 40 MHz digital oscilloscope with Bus Health Test and SCC Kit
  • Two 5,000 counts true-RMS digital multimeters
  • Automatic measurements
  • A dual-input TrendPlot recorder
  • Connect-and-View trigger simplicity for hands-off operation
  • Shielded test leads for oscilloscope, voltage, resistance and continuity measurements
  • Up to 7 hours battery operation
  • 600 V CAT III safety certified
  • Supplied with one VPS41 10:1 Voltage Probe, i400s AC Current Clamp, screen protector, soft carrying case, magnetic hanger, and FlukeView software
  • Optically-isolated interface for PC connection (optional cable sold separately)
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Fluke 125B/NA/S Shown
Product Information
Datasheet 2.22 MB PDF
Manual 3.82 MB PDF
PDF HelpPDF Help

The compact Fluke ScopeMeter 125B/NA/S Series, is the rugged oscilloscope solution for industrial electrical and electromechanical equipment troubleshooting and maintenance applications. It's a truly integrated test tool, with oscilloscope, multimeter and high-speed recorder in one easy-to-use instrument. The Fluke 125BNAS also integrates with Fluke Connect mobile app and FlukeView for ScopeMeter software to enable further collaboration, data analysis and archiving of critical test information.

Display waveforms with Connect and View trigger and setup technology and automatically view related numerical measurements using Fluke IntellaSet technology, all without making manual measurement adjustments. With Recorder Event Detect capabilities, elusive intermittent events are captured and logged for easy viewing and analysis. The 125B/NA/S Scopemeter features 2 channels with a 40MHz response time and 40 MS/s sample rate, and comes with a SCC kit.

Connect-and-View triggering for an instant, stable display
Oscilloscope users know how difficult triggering can be. Using the wrong settings can lead to unstable waveform captures, and sometimes the wrong measurement data. Fluke's unique Connect-and-View triggering technology recognizes signal patterns, and automatically sets up the correct triggering to provide a stable, reliable and repeatable display. Connect-and-View triggering is designed to work with virtually any signal, including motor drives and control signals - without adjusting parameters, or even touching a button. Signal changes are instantly recognized and settings are automatically adjusted, providing a stable display even when measuring multiple test points in quick succession.
Fluke 120B Series

The Auto Readings function with Fluke IntellaSet technology uses proprietary algorithms to intelligently analyze the measured waveform and automatically displays the most appropriate numerical measurements on screen, so you can get the data you need easier than ever before. As an example, when the measured waveform is a line voltage signal, the Vrms and Hz readings are automatically displayed, whereas if the measured waveform is a square wave, the Vpeak-peak and Hz readings are automatically displayed. Using IntellaSet technology in conjunction with Connect-and-View automatic triggering you can be sure you're seeing not only the correct waveform, but the appropriate numerical reading as well. All without touching a button.
Industrial equipment needs a reliable power supply to operate properly, use the dual input to obtain key power measurements.
For single phase or 3-phase balanced systems, the dual inputs of the Industrial ScopeMeter 125B/NA/S can measure ac+dc rms voltage on channel A and ac+dc rms current on channel B. The Fluke 125B can then calculate; frequency, phase angle, active power (kW), reactive power (VA or var), power factor (PF) or displacement power factor (DPF) and can also calculate the power values for a 3-phase system where all phases have equal voltage and currents. This applies to both balanced system and resistive loads.
Fluke 120B Series
Harmonics measurements
Harmonics are periodic distortions of voltage, current, or power sine waves. Harmonics in power distribution systems are often caused by non-linear loads such as switched mode dc power supplies and adjustable speed motor drives. Harmonics can cause transformers, conductors, and motors to overheat. In the Harmonics function, the Test Tool measures harmonics to the 51st. Related data such as dc components, THD (Total Harmonic Distortion), and K factor are measured to provide a complete insight in to the electrical state of health of your loads.
Fluke 120B Series
Use the comprehensive recorder modes to help find intermittent faults with ease
The toughest faults to find are those that happen only once in a while - intermittent events. They can be caused by bad connections, dust, dirt, corrosion or simply broken wiring or connectors. Other factors, like line outages and sags or the starting and stopping of a motor, can also cause intermittent events resulting in equipment shutdowns. When these events happen, you may not be around to see it. But, your Fluke ScopeMeter 125B/NA/S will. You can either plot the minimum and maximum peak measurement values or record the waveform trace. And, with expandable micro SD memory, recording sessions can be done for up to 14 days. This recorder is even more powerful with the addition of Recorder Event Detect, which makes detecting and logging intermittent faults easier than ever. Just set a threshold on a meter reading or scope trace and deviations are tagged as unique events. You no longer need to search through masses of data to pinpoint faults, and can quickly step from one tagged event to the next, while still having access to the full data set.
Fluke 120B Series

Industrial BusHealth Test verifies electrical signal quality on industrial buses
BusHealth Test analyzes the electrical signals on the industrial bus or network and gives a clear "Good, "Weak or "Bad indication mark for each of the relevant parameters, presented next to the actual measurement value. Measured values are compared to standard values based on the selected bus types (CAN-bus, Profi-bus, Foundation Field, RS-232 and many more), or, unique reference values can be set if different tolerances are required. The Fluke 125B can validate the quality of the electrical signals as soon as they are passed along the network, without looking at the data content. Additionally, the 125B checks the signal levels and speed, transition times and distortion, and compares these to the appropriate standards to help you find errors such as improper cable connections, bad contacts, incorrect grounding or improper terminators.
Fluke 120B Series
One test lead to measure multiple electrical parameters
High frequency waveform, meter, capacitance and resistance measurements as well as continuity checks are all covered by single set of shielded test leads. No time is wasted finding or swapping leads.
Fluke 120B Series

FlukeView ScopeMeter Software for Windows
Get more out of your ScopeMeter 120B with FlukeView Software:

  • Store instrument's screen copies on the PC, in color
  • Copy screen images into your reports and documentation
  • Capture and store waveform data from your ScopeMeter test tool on your PC
  • Create and archive waveform references for easy comparison
  • Copy waveform data into your spreadsheet for detailed analysis
  • Use cursors for parameter measurement
  • Add user text to instrument setups and send them to the instrument for operator reference and instructions

Fluke Connect mobile app compatibility
Automated industrial machinery is harder than ever to trouble shoot. It's not enough to just know where you have to test, you also have to know what to look for - and that can be hard without baseline measurement data or access to subject matter experts. The Fluke Connect Assets wireless system of software and wireless test tools enables technicians to reduce maintenance costs and increase uptime with accurate equipment records and maintenance data that is easy to interpret, and share. Compare and contrast test point measurement data and trends so you can better understand signal characteristics and changes over time. And, by storing maintenance data on the Fluke Cloud you can enable team members to access it from wherever and whenever they need to so you can get advice or approvals in the field and get your systems up and running faster than ever before.

Product Comparison Chart Fluke 123B Fluke 124B Fluke 125B
Full Function Dual Input Scope and Meter
Oscilloscope Bandwidth MHz 20 40 40
Meter and Scope Recorder
Scope Cursor Measurements  
Power and Harmonics Measurements    
Included Accessories
10:1 voltage probe  
i400S AC current clamp    
Download the app:
Android app on Google Play
Ordering Information
Model Description Buy Now Price
MFR ID: 4756068
Fluke 125B/S 40 MHz 2 Ch, 40 MS/s Scopemeter, Hand-Held Oscilloscope with Bus Health and SCC Kit Buy Now $2,899.99
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Included Accessories
  • 1 - Industrial ScopeMeter Handheld Oscilloscope (40 MHz)
  • 1 - Shielded Test Lead Set with Black Ground Leads
  • 1 - Test Lead, Black (for Grounding)
  • 1 - HC120-II Hook Clip Set (one Red, one Black)
  • 1 - Banana-to-BNC Adapter (black)
  • 1 - Battery Charger/Line Voltage Adapter
  • 1 - Rechargeable Li-ion Battery Pack (Installed)
  • 1 - USB Angled Adapter
  • 1 - WiFi USB Adapter
  • 1 - VPS41 - 10:1 Voltage Probe
  • 1 - i400s - AC Current Clamp
  • 1 - User Manual (CD-ROM), Multi-lingual
  • 1 - C120B - Soft Carrying Case
  • 1 - 1730-HANGER - Magnetic Hanger
  • 1 - SW90W - FlukeView ScopeMeter Software for Windows
  • 1 - SP120B - Screen Protector
Optional Accessories
Batteries, Chargers, & Adapters
MFR ID: 4328676
Fluke BC430/820 Line Voltage Adapter/Battery Charger Buy Now Sale $176.95
(Reg. $199.99)
MFR ID: 4025762
Fluke BP290 10.8V, 2400 mAh Li-Ion Rechargeable Battery Pack for Fluke 190 Series II Buy Now Sale $224.99
(Reg. $249.99)
Cables & Adapters
MFR ID: 2150594
Fluke BP880 BNC Female to Double Stacking Banana Plug Buy Now Sale $19.74
(Reg. $24.99)
MFR ID: 2151015
Fluke BP881 BNC Male to Double Stacking Banana Plug Buy Now Sale $23.95
(Reg. $24.99)
MFR ID: 2166266
Fluke OC4USB Optically Isolated Serial to USB Interface Cable Buy Now Sale $165.99
(Reg. $199.99)
Carrying Cases & Hangers
MFR ID: 4358028
Fluke 1730-HANGER Hanger Strap Kit for the Fluke 1730 Buy Now $69.99
Current Clamps
MFR ID: 4744391
Fluke C120B Soft Carrying Case for the 120B Series Buy Now $129.99
MFR ID: 114519
Fluke 80I-110S AC/DC Current Clamp Buy Now Sale $719.99
(Reg. $799.99)
MFR ID: 1568487
Fluke i1000s 1000 Amp AC Current Clamp Buy Now Sale $517.49
(Reg. $574.99)
MFR ID: 617735
Fluke I1010 600AAC/1000ADC AC/DC Current Clamp Buy Now Sale $382.49
(Reg. $424.99)
MFR ID: 664760
Fluke i200S 200A AC Current Clamp, with BNC to banana adapter Buy Now Sale $224.99
(Reg. $249.99)
MFR ID: 657202
Fluke i3000s 3000A AC iFlex Flexible Current Probe Buy Now Sale $562.49
(Reg. $624.99)
I3000S FLEX-24
MFR ID: 2584888
Fluke i3000S Flex-24 3000 Amps AC Current Clamp, 610 mm (24 in.) Buy Now Sale $472.49
(Reg. $524.99)
I3000S FLEX-36
MFR ID: 2584901
Fluke I3000S FLEX-36 3000A 36 inch AC iFlex Flexible Current Probe Buy Now Sale $562.49
(Reg. $624.99)
MFR ID: 2584935
Fluke I30S 20AAC/30ADC AC/DC Current Clamp, with BNC to Dual Banana Adapter Buy Now Sale $562.49
(Reg. $624.99)
MFR ID: 2840309
Fluke i310s 300AAC/450ADC AC/DC Current Clamp, with BNC to Dual Banana Adapter Buy Now Sale $404.99
(Reg. $449.99)
MFR ID: 2277202
Fluke i400s 400 Amp AC Current Clamp with BNC. Switchable, 40 Amp & 400 Amp, Ranges Buy Now Sale $260.99
(Reg. $289.99)
MFR ID: 617727
Fluke i410 400A AC/DC Current Clamp Buy Now Sale $242.99
(Reg. $269.99)
MFR ID: 2508467
Fluke I5S 5A AC Current Probe Buy Now Sale $517.49
(Reg. $574.99)
Screen Protectors
MFR ID: 4744414
Fluke SP120B Screen Protector for the 120B Series Buy Now $39.99
MFR ID: 4744423
Fluke SCC120B Software Soft Carry Case Accessory Kit for 120B Series Buy Now $449.99
MFR ID: 3894923
Fluke SW90W FlukeView ScopeMeter Software For the Fluke ScopeMeter 190 & 120 Series Buy Now Sale $269.99
(Reg. $299.99)
Test Leads
MFR ID: 1590606
Fluke TL40 300V/3A CAT III Retractable Tip Test Lead Set (Red/Black) Buy Now Sale $39.14
(Reg. $44.99)
MFR ID: 1278079
Fluke AC87 Heavy Duty Bus Bar Clip Set, (one red, one black) Buy Now Sale $38.24
(Reg. $44.99)
MFR ID: 4744369
Fluke BB120-II Shielded Banana to Female BNC Adapter (Set of 2) Buy Now $39.99
MFR ID: 3379374
Fluke BHT190 Break-Out Adapter for Industrial Bus Connections, DB-9 and M-12 Buy Now Sale $539.99
(Reg. $599.99)
MFR ID: 4744357
Fluke HC120 Hook Clips (Set of 2: Red, Gray) Buy Now $44.99
MFR ID: 4744340
Fluke STL120-IV Shielded Test Leads Set 600V CAT IV Buy Now $149.99
MFR ID: 614187
Fluke TAS90 Shielded Test Lead Accessory Set Buy Now Sale $66.11
(Reg. $79.99)
MFR ID: 2003625
Fluke TL220 Suregrip Industrial Test Lead Set (Red/Black) Buy Now Sale $64.79
(Reg. $79.99)
MFR ID: 2003602
Fluke TL221 Suregrip Silicone Test Lead Extension Kit (Red/Black) Buy Now Sale $26.39
(Reg. $29.99)
MFR ID: 1610198
Fluke TL224 SureGrip Silicone Insulated Test Leads (Red/Black) Buy Now Sale $24.29
(Reg. $29.99)
MFR ID: 1274382
Fluke TL71 1000V/10A CAT II Premium Test Lead Set (Red/Black) Buy Now Sale $24.29
(Reg. $29.99)
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Fluke TL81A Deluxe Test Lead Set, 300V, Pouch, 22 Pc. (Red/Black) Buy Now Sale $128.29
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MFR ID: 1616632
Fluke TL910 1000V/3A, CAT II Electronic Test Probe Set (Red/Black) Buy Now Sale $53.89
(Reg. $69.99)
MFR ID: 1616659
Fluke TP920 Test Probe Adapter Kit (Red/Black) Buy Now Sale $31.99
(Reg. $39.99)
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Fluke VPS41 Voltage Probe Set 40 MHz 600V CAT IV Buy Now $149.99