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Fluke 125B Industrial ScopeMeter
  • Fluke 125B Industrial ScopeMeter
  • Fluke 125B Industrial ScopeMeter
  • Fluke 125B Industrial ScopeMeter

Fluke 125B Industrial ScopeMeter

Fluke authorised distributor and calibration house.

Includes: Fluke 125B, Li-Ion battery pack, charger/power adapter, 2 shielded test leads with ground leads, black test lead, red and blue hook clips, banana to BNC adapter, and WiFi USB adapter.

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The Fluke 125B is a truly integrated test tool, with oscilloscope, multimeter and high-speed recorder in one easy-to-use instrument. The 125B scopemeter also integrates with Fluke Connect® mobile app and FlukeView® for ScopeMeter software to enable further collaboration, data analysis and archiving of critical test information.

For single phase or 3-phase balanced systems, the dual inputs of the Industrial ScopeMeter® 120B Series 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.

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.


Voltage, current and power waveforms with numerical values including harmonics, resistance, diode, continuity and capacitance measurements.


Dual-input digital oscilloscope and multimeter.
40 MHz oscilloscope bandwidth.
Two 5,000-count true-rms digital multimeters.
Connect-and-View™ trigger simplicity for hands-off operation.
IntellaSet™ technology automatically and intelligently adjusts numerical readout based on the measured signal.
Dual-input waveform and meter reading recorder for trending data over extended periods.
Recorder Event Detect captures elusive intermittent signals on repetitive waveforms up to 10 KHz.
Shielded test leads for oscilloscope, resistance and continuity measurements.
Resistance, continuity, diode and capacitance meter measurements.
Power measurements (W, VA, VAR, PF, DPF, Hz).
Voltage, current and power harmonics.
Check Industrial networks with BusHealth physical layer tests against defined reference levels.
Save or recall data and instrument setups.
Store instrument setups defined by a test sequence for routine maintenance or most often used test procedures.
External optically isolated USB interface to transfer, archive and analyze scope or meter data.
Optional WiFi adapter connected to internal USB port to wirelessly transfer information to the PC, laptop or Fluke Connect® mobile app.
FlukeView® ScopeMeter® Software for Windows®.
Rugged design to withstand 3g Vibration, 30g shock, and rated IP51 according to EN/IEC60529.
Highest safety rating in the industry: safety rated for CAT IV 600 V.
Li-Ion rechargeable battery, seven-hours operation (with four-hour charge time).

Fluke 120B Series Scopemeter Video Overview

Fluke 125B Specifications
Oscilloscope mode
Frequency response - dc coupled Without probes and test leads (with BB120) 123B: dc to 20 MHz (-3 dB)
124B and 125B: dc to 40 MHz (-3 dB).
With STL120-IV 1:1 shielded test leads DC to 12.5 MHz (-3 dB) / dc to 20 MHz (-6 dB).
With VP41 10:1 Probe 123B: dc to 20MHz (-3 dB)
124B and 125B: dc to 40 MHz (-3 dB).
Frequency response - ac coupled (lf roll off) Without probes and test leads <10 Hz (-3 dB).
With STL120-IV 1:1 shielded test leads <10 Hz (-3 dB).
With VP41 10:1 Probe <10 Hz (-3 dB).
Rise time, excluding probes,
test leads
123B <17.5 ns
124B and 125B <8.75 ns.
Input impedance Without probes and test leads 1 MΩ//20 pF.
With BB120 1 MΩ//24 pF.
With STL120-IV 1:1 shielded test leads 1 MΩ//230 pF
With VP41 10:1 Probe 5 MΩ//15.5 pF.
Sensitivity 5 mV to 200 V/div.
Analog bandwidth limiter 10 kHz.
Display modes A, -A, B, -B.
Max. input voltage A and B Direct, with test leads, or with VP41 Probe 600 Vrms Cat IV, 750 Vrms maximum voltage.
With BB120 600 Vrms.
Max. floating voltage, from any terminal to ground 600 Vrms Cat IV, 750 Vrms up to 400Hz.
Scope modes Normal, Single, Roll.
Ranges (normal) Equivalent sampling 123B: 20 ns to 500 ns/div.
124B and 125B: 10 ns to 500 ns/div.
Real time sampling 1 μs to 5 s/div.
Single (real time) 1 μs to 5 s/div.
Roll (real time) 1s to 60 s/div.
Sampling rate (for both channels simultaneously) Equivalent sampling (repetitive signals) Up to 4 GS/s.
Real time sampling 1 μs to 60 s/div 40 MS/s.
Screen update Free run, on trigger.
Source A, B.
Sensitivity A and B @ DC to 5 MHz 0.5 divisions or 5 mV.
@ 40 MHz 123B: 4 divisions.
124B and 125B: 1.5 divisions.
@ 60 MHz 123B: N/A.
124B and 125B: 4 divisions.
Slope Positive, negative.
Advanced scope functions
Display modes Normal Captures up to 25 ns glitches and displays analog-like persistence waveform.
Smooth Suppresses noise from a waveform.
Glitch off Does not capture glitches between samples.
Envelope Records and displays the minimum and maximum of waveforms over time.
Auto set (Connect-and-View™) Continuous fully automatic adjustments of amplitude, time base, trigger levels, trigger gap, and hold-off. Manual override by user adjustment of amplitude, time base, or trigger level.
Dual input meter
The accuracy of all measurements is within ±(% of reading + number of counts) from 18 °C to 28 °C.
Add 0.1x (specific accuracy) for each °C below 18 °C or above 28 °C. For voltage measurements with 10:1 probe, add probe uncertainty +1%. More than one waveform period must be visible on the screen.
Input A and input B
DC voltage (VDC)
Ranges 500 mV, 5 V, 50 V, 500 V, 750 V.
Accuracy ±(0.5% +5 counts).
Common mode rejection (CMRR) >100 dB @ dc, >60 dB @ 50, 60, or 400 Hz.
Full scale reading 5000 counts.
True-rms voltages (V ac and V ac+dc)
Ranges 500 mV, 5 V, 50 V, 500 V, 750 V
Accuracy for 5% to 100% of range (DC coupled) DC to 60 Hz (V ac+dc) ±(1% +10 counts).
1 Hz to 60 Hz (V ac) ±(1% +10 counts).
Accuracy for 5% to 100% of range (AC or dc coupled) 60 Hz to 20 kHz ±(2.5% +15 counts).
DC rejection (only VAC) >50 dB.
Common mode rejection (CMRR) >100 dB @ dc.
>60 dB @ 50, 60, or 400 Hz.
Full scale reading 5000 counts, reading is independent of any signal crest factor.
Modes Max peak, Min peak, or pk-to-pk.
Ranges 500 mV, 5 V, 50 V, 500 V, 2200 V.
Accuracy Accuracy Max peak or Min peak 5% of full scale.
Accuracy Peak-to-Peak 10% of full scale.
Full scale reading 500 counts
Frequency (Hz)
Ranges 123B: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz,1 MHz, 10 MHz, and 50 MHz.
124B and 125B: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz, 10 MHz, and 70 MHz.
Frequency range 15 Hz (1 Hz) to 50 MHz in continuous autoset.
Accuracy @1 Hz to 1 MHz ±(0.5% +2 counts).
Full scale reading 10,000 counts.
Max reading 50.00 kRPM.
Accuracy ±(0.5% +2 counts).
Duty cycle (PULSE)
Range 2% to 98%.
Frequency range 15 Hz (1 Hz) to 30 MHz in continuous autoset.
Pulse width (PULSE)
Frequency range 15 Hz (1 Hz) to 30 MHz in continuous autoset.
Full scale reading 1000 counts.
Amperes (AMP)
With current clamp Ranges Same as V dc, V ac, V ac+dc, or PEAK.
Scale factors 0.1 mV/A, 1 mV/A, 10 mV/A, 100 mV/A, 400 mV/A, 1 V/A, 10 mV/mA.
Accuracy Same as V dc, V ac, V ac+dc, or PEAK (add current clamp uncertainty).
Temperature (TEMP) with optional temperature probe
Range 200 °C/div (200 °F/div).
Scale factor 1 mV/°C and 1 mV/°F.
Accuracy As V dc (add temp. probe uncertainty).
Decibel (dB)
0 dBV 1 V.
0 dBm (600 Ω /50 Ω) 1 mW referenced to 600 Ω or 50 Ω.
dB on V dc, V ac, or Vac+dc.
Full scale reading 1000 counts.
Crest factor (CREST)
Range 1 to 10.
Full scale reading 90 Counts.
Modes A to B, B to A.
Range 0 to 359 degrees.
Resolution 1 degree.
Power (125B only)
Configurations 1 phase / 3 phase 3 conductor balanced loads (3 phase: fundamental component only, AUTOSET mode only).
Power factor (PF) Ratio between watts and VA range - 0.00 to 1.00.
Watt RMS reading of multiplying corresponding samples of input A (volts) and input B (amperes).
Full scale reading 999 counts.
VA Vrms x Arms
Full scale reading 999 counts.
VA reactive (var) √((VA)2-W2)
Full scale reading 999 counts.
Purpose To measure on pulse width modulated signals, like motor drive inverter outputs.
Principle Readings show the effective voltage based on the average value of samples over a whole number of periods of the fundamental frequency.
Accuracy As Vrms for sinewave signals.
Input A to common
Ohm (Ω)
Ranges 123B and 124B 500 Ω , 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ.
125B 50 Ω, 500 Ω , 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ.
Accuracy ±(0.6% + 5 counts) 50 Ω ±(2% + 20 counts).
Full scale reading 50 Ω to 5 MΩ - 5000 counts, 30 MΩ - 3000 counts.
Measurement current 0.5 mA to 50 nA, decreases with increasing ranges.
Open circuit voltage <4 V.
Continuity (Cont)
Beep <(30 Ω ±5 Ω) in 50 Ω range.
Measurement current 0.5 mA.
Detection of shorts of ≥1 ms.
Measurement voltage @0.5 mA >2.8 V.
@open circuit <4 V.
Measurement current 0.5 mA.
Polarity + on input A, - on COM.
Capacitance (CAP)
Ranges 50 nF, 500 nF, 5 μF, 50 μF, 500 μF.
Full scale reading 5000 counts.
Measurement current 500 nA to 0.5 mA, increases with increasing ranges.
Advanced meter functions
Zero Set Set actual value to reference.
AutoHold (on A) Captures and freezes a stable measurement result. Beeps when stable. AutoHold works on the main meter reading, with thresholds of 1 Vpp for AC signals and 100 mV for DC signals.
Fixed decimal point Activated by using attenuation keys.
Cursor Readout (124B and 125B)
Sources A, B.
Single vertical line Average, min and max readout.
Average, min, max and time from start of readout (in ROLL mode; instrument in HOLD).
Min, max and time from start of readout (in RECORDER mode; instrument in HOLD).
Harmonics values in POWER QUALITY mode.
Dual vertical lines Peak-peak, time distance and reciprocal time distance readout.
Average, min, max and time distance readout (in ROLL mode; instrument in HOLD).
Dual horizontal lines High, low and peak-peak readout.
Rise or fall time Transition time, 0%-level and 100%-level readout (manual or auto leveling; auto leveling only
possible in single channel mode).
Accuracy As oscilloscope accuracy.
The recorder captures meter readings in Meter Recorder mode or continuously captures waveform samples in Scope Recorder mode. The information is stored on internal memory or on optional SD card (with the 125B or 124B).
The results are displayed as Chart recorder display that plots a graph of min and max values of Meter measurements over time or as a waveform recorder display that plots all the captured samples.
Meter readings
Measurement Speed Maximum 2 measurement/s.
Record Size (min, max, average) 2 M readings for 1 channel.
Recorded Time Span 2 weeks.
Maximum number of events 1024.
Waveform record
Maximum sample rate 400 K sample/s.
Size Internal memory 400 M samples Recorded Time.
Span internal memory 15 minutes at 500 μs/div
11 hours at 20 ms/div.
Record Size SD card 1.5 G samples.
Recorded Time Span SD card 11 hours at 500 μs/div
14 days at 20 ms/div.
Maximum number of events 64.
Power Quality (125B only)
Readings Watt, VA, var, PF, DPF, Hz.
Watt, VA, var ranges (auto) 250 W to 250 MW, 625 MW, 1.56 GW.
When selected: total (% r) ±(2% + 6 counts).
When selected: fundamental (% f) ±(4% + 4 counts).
DPF 0.00 to 1.00.
PF 0.00 to 1.00, ±0.04.
Frequency range 10.0 Hz to 15.0 kHz
40.0 Hz to 70.0 Hz.
Number of Harmonics DC to 51.
Readings / Cursor readings
(fundamental 40 Hz to 70 Hz)
Vrms / Arms /Watt Each harmonic from fundamental maybe selected for individual readings.
Includes frequency of fundamental, phase Angle and K-factor (in Amp and Watt).
BusHealth tester (Fluke 125B only)
Type Subtype Protocol.
AS-i NEN-EN50295.
CAN ISO-11898.
Interbus S RS-422 EIA-422.
Modbus RS-232 RS-232/EIA-232.
RS-485 RS-485/EIA-485.
Foundation Fieldbus H1 61158 type 1, 31.25 kBit.
Profibus DP EIA-485.
PA 61158 type 1.
Display Type 5.7-inch color active matrix TFT.
Resolution 640 x 480 pixels.
Waveform Display Vertical 10 div of 40 pixels.
Horizontal 12 div of 40 pixels.
Power External Via Power Adapter BC430.
Input voltage 10 V DC to 21 V DC.
Power consumption 5 W typical.
Input connector 5 mm jack.
Internal Via Battery Pack BP290.
Battery power Rechargeable Li-Ion 10.8 V.
Operating time 7 hours with 50% backlight brightness.
Charging time 4 hours with test tool off, 7 hours with test tool on.
Allowable ambient temp 0 to 40 °C (32 to 104 °F) during charging.
Memory Internal memory can store 20 data sets (screen waveform and setup). Micro SD card slot with optional SD card (max size of 32 GB).
Mechanical Size 259 x 132 x 55 mm
(10.2 x 5.2 x 2.15 in).
Weight 1.4 kg (3.2 lb) including battery pack.
Interface Optically isolated Transfer screen copies (bitmaps), settings and data.
USB to PC/laptop OC4USB optically isolated USB adapter/cable, (optional), using FlukeView® software for Windows®.
Optional WiFi adapter Fast transfer of screen copies (bitmaps), settings and data to PC/laptop, tablet, smartphone, etc. A USB port is provided for attaching the WiFi dongle. Do not use the USB port with a cable for safety reasons.
Environmental MIL-PRF-28800F, Class 2.
Temperature Battery Operation 0 to 40 °C (32 to 104 °F).
Power Adapter Operation 0 to 50 °C (32 to 122 °F).
Storage -20 to 60 °C (-4 to 140 °F).
Humidity (Operating) @ 0 to 10 °C (32 to 50 °F) Non-condensing.
@ 10 to 30 °C (50 to 86 °F) 95%.
@ 30 to 40 °C (86 to 104 °F) 75%.
@ 40 to 50 °C (104 to 122 °F) 45%.
Storage @ -20 to 60 °C (-4 to 140 °F) Non-condensing.
Altitude Operating at 3 km (10,000 feet) CAT III 600 V.
Operating at 2 km (6,600 feet) CAT IV 600 V.
Storage 12 km (40,000 feet).
EMC electromagnetic compatibility International IEC 61326-1: Industrial, CISPR 11: Group 1, Class A.
Korea (KCC) Class A Equipment (Industrial Broadcasting & Communication Equipment).
USA (FCC) 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103.
Wireless radio with adapter Frequency range 2412 MHz to 2462 MHz.
Output power <100 mW.
Enclosure protection IP51, ref: EN/IEC60529.
Safety General IEC 61010-1: Pollution Degree 2.
Measurement IEC 61010-2-033: CAT IV 600 V/CAT III 750 V.
Max. input voltage input A and B Direct on input or with leads 600 Vrms CAT IV for derating.
With Banana-to-BNC Adapter BB120 600 Vrms for derating.
Max. floating voltage from any terminal to ground 600 Vrms Cat IV, 750 Vrms up to 400 Hz.


Fluke 120B Series Datasheet

PDF Specifications of the Fluke 123B, Fluke 124B & Fluke 125B Scopemeters.

Download (1.33M)
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