Fluke 125BS Digital Oscilloscope (40 MHz)

The Fluke 125B/S Industrial ScopeMeter® is a robust and versatile handheld oscilloscope tailored for troubleshooting and maintenance applications in industrial electrical and electro-mechanical equipment. This model integrates the functionalities of an oscilloscope, multimeter, and high-speed recorder, providing a comprehensive test tool in a single compact device.

The 125 B/S model is distinguished by its 40 MHz oscilloscope bandwidth and includes advanced features like Connect-and-View™ trigger simplicity, which offers hands-off operation by automatically displaying stable waveforms without the need for manual adjustments. Additionally, it features IntellaSet™ technology, which intelligently adjusts numerical readouts based on the measured signal, enhancing the efficiency and accuracy of troubleshooting tasks.

Fluke 125 B/S ScopeMeter

This ScopeMeter® also supports the Fluke Connect mobile app and FlukeView® for ScopeMeter software, allowing for enhanced collaboration, data analysis, and archiving of critical test information. It is designed to withstand harsh industrial environments, evidenced by its high safety rating for CAT IV 600 V and a rugged design that can withstand vibration, shock, and is rated IP51 for dust and drip-proof protection. The device operates on a Li-Ion rechargeable battery, ensuring up to seven hours of operation, making it suitable for extended use in the field.

For industrial applications, the fluke 125B/S can perform a variety of measurements including voltage, current, power waveforms, harmonics, resistance, diode, continuity, and capacitance measurements. It is equipped with capabilities for power measurements (W, VA, VAR, PF, DPF, Hz) and harmonics analysis, providing a comprehensive understanding of the electrical health of loads. The model also features an industrial Bus Health Test, verifying electrical signal quality on industrial buses and networks, which is crucial for ensuring the reliability and efficiency of industrial systems.

With its combination of durability, precision, and advanced features, the Fluke 125B/S Industrial ScopeMeter® is well-suited for professionals seeking a reliable tool for industrial maintenance and troubleshooting applications.

Fluke 125B/S Specifications:

Oscilloscope mode
Vertical
Frequency Response – DC coupled	without probes and measuring lines (with BB120)	123B: DC to 20 MHz (-3 dB) 124B, 125B: DC to 40 MHz (-3 dB)
	with shielded 1:1 measuring cable pair STL120-IV	DC to 12.5 MHz (-3 dB) / DC to 20 MHz (-6 dB)
	with 10:1 probe VP41	123B: DC to 20 MHz (-3 dB) 124B, 125B: DC to 40 MHz (-3 dB)
Frequency Response – AC coupled (when ROLL mode off)	without probes and measuring lines	<10Hz (-3dB)
	with shielded 1:1 measuring cable pair STL120-IV	<10Hz (-3dB)
	with 10:1 probe VP41	<10Hz (-3dB)
Rise time, without probes or	123B <17.5 ns 124B and 125B < 8.75 ns
Input impedance	without probes and measuring lines	1MΩ//20pF
	with BB120	1MΩ//24pF
	with shielded 1:1 measuring cable pair STL120-IV	1MΩ//230pF
	with 10:1 probe VP41	5MΩ//15.5pF
sensitivity	5 mV to 200 V/div
Analog bandwidth limiter	10kHz
Display modes	A, -A, B, -B
Max. input voltage A and B	directly, with measuring cables or VP41 probe	CAT IV 600 Veff
Max. input voltage A and B	with BB120	600 Veff
Max. floating voltage, from each connection to ground	CAT IV 600 Veff
Horizontal
Oscilloscope modes	Normal, Single, Roll mode
Areas (Normal)	Sampling of repetitive signals	123B: 20ns to 500ns/Div,
	Sampling of repetitive signals	124B and 125B: 10ns to 500ns/div
	Real-time sampling	1 µs to 5 s/div
	Single (real time)	1 µs to 5 s/div
	Roll mode (real time)	1 s to 60 s/div
Sample rate (for both inputs simultaneously)	Sampling rate (both channels, repeating signals)	up to 4 GS/s
Sample rate (for both inputs simultaneously)	Real-time sampling 1 s to 60 s/div.	40MS/s

Triggering
Display update	Free running when triggered
source	AWAY
Sensitivity A and B	at DC up to 5 MHz	0.5 divisions or 5 mV
	at 40MHz	123B: 4 Div
		124B and 125B: 1.5 div
	at 60MHz	123B: N/A
		124B and 125B: 4 Div
Flank	Rising, Falling

Additional oscilloscope functions
Display modes	Normal	Detects glitches (short disturbance pulses) up to 25 ns and displays an analogue-like afterglow signal form
	smoothing	Removes noise from a waveform
	Glitch capture off	Does not capture glitches between sample points
	Envelope	Records and displays the minimum and maximum values of waveforms over time
Auto Set (Connect-and-View™)	Constant fully automatic adjustment of amplitude, time base, trigger level, trigger distance and delay time. Manual deactivation by user setting of amplitude, time base or trigger level.

Probe accuracy +1%. There must be at least one waveform period visible on the display.

Dual channel multimeter
The accuracy of all measurements is between 18 °C and 28 °C within ± (% of the measured value + counting steps of the least significant digit).
Add 0.1 x (specified accuracy) for each °C below 18°C or above 28°C. For voltage measurements with a 10:1 probe, add them together

Entrance A and Entrance B
DC voltage (VDC)
areas	500mV, 5V, 50V, 500V, 750V
accuracy	±(0.5% + 5)
Common Mode Rejection (CMRR)	>100 dB at DC, >60 dB at 50, 60 or 400 Hz
Display scope	5,000 counting steps
True RMS voltage values (V AC and V AC+DC)
areas	500mV, 5V, 50V, 500V, 750V
Accuracy for 5% to 100% of range (DC coupled)	DC to 60 Hz (V AC+DC)	±(1% + 10)
	1Hz to 60Hz (VAC)	±(1% + 10)
Accuracy for 5% to 100% of range (AC or DC coupled)	60Hz to 20kHz	±(2.5% + 15)
DC suppression (VAC only)	>50dB
Common Mode Rejection (CMRR)	>100 dB at DC
	>60 dB at 50, 60, or 400 Hz
Display scope	5000 counting steps, measured value is independent of the crest factor.
peak value
Display types	Max Peak, Min Peak, or Peak to Peak
areas	500mV, 5V, 50V, 500V, 2200V
accuracy	Max Peak or Min Peak	5% of the range end value
	Accuracy peak to peak	10% of the range end value
Display scope	500 counting steps
Frequency (Hz)
areas	123B: 1Hz, 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, 1MHz, 10MHz, and 50MHz
	124B and 125B: 1Hz, 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, 1MHz, 10MHz and 70MHz
Frequency range	15 Hz (1 Hz) to 50 MHz with continuous automatic adjustment
Accuracy at 1 Hz to 1 MHz	±(0.5% + 2)
Display scope	Display size up to 10,000
revolutions/min. (RPM or min-1)
Maximum value	50,000 rpm
accuracy	±(0.5% + 2)
duty cycle
Area	2% to 98%
Frequency range	15 Hz (1 Hz) to 30 MHz with continuous automatic adjustment
Pulse width
Frequency range	15 Hz (1 Hz) to 30 MHz with continuous automatic adjustment
Display scope	1000 counting steps
Current strength
with current clamp	areas	such as V DC, V AC, V AC+DC or peak value
	Scaling factors	0.1mV/A, 1mV/A, 10mV/A, 100mV/A, 400mV/A, 1V/A, 10mV/mA
	accuracy	as with V DC, V AC, V AC+DC, or PEAK (the inaccuracy of the current clamp must be added)
Temperature with optional temperature sensor
Area	200°C/div (200°F/div)
Scaling factor	1mV/°C and 1mV/°F
accuracy	as with V DC (the inaccuracy of the temperature sensor must be added)
Decibel (dB)
0dBV	1V
0dBm (600Ω /50Ω)	1 mW related to 600 Ω or 50 Ω
dB for	V DC, V AC or V AC+DC
Display scope	1000 counting steps
Crest factor
Area	1 to 10
Display scope	90 counting steps
phase
Types of measurement	A to B, B to A
Area	0 to 359 degrees
resolution	1 degree
Power (125B only)
Configurations	1-phase or 3-phase with symmetrical load (3-phase: only fundamental component, only AUTOSET operation)
Power factor (PF)	Ratio between active power and apparent power: 0.00 to 1.00
Active power (watts)	RMS measurements of corresponding samples from input A (voltage) and input B (current)
	Display scope	999 counting steps
Apparent power (VA)	V eff x A eff
	Display scope	999 counting steps
Reactive power (VAR)	√((VA)²-W²)
	Display scope	999 counting steps
Vpwm
Purpose	For measuring pulse width modulated signals, e.g. B. at the outputs of frequency converters
principle	Measurements show the effective voltage based on the average of sample points over a range of periods of the fundamental frequency
accuracy	as with Veff for sine signals

Entrance A
Resistance (Ω)
areas	123B and 124B	500Ω, 5kΩ, 50kΩ, 500kΩ, 5MΩ, 30MΩ
	125B	50Ω, 500Ω, 5kΩ, 50kΩ, 500kΩ, 5MΩ, 30MΩ
accuracy	± (0.6% + 5), in the range 50 Ω ±(2% + 20)
Display scope	50 Ω to 5 MΩ – 5000 counts, 30 MΩ – 3000 counts
measuring current	0.5 mA to 50 nA, decreasing with larger ranges
Open circuit voltage	<4V
Continuity test
Acoustic signal	<(30 Ω ± 5 Ω) in the 50 Ω range
measuring current	0.5mA
Detection of short circuits	≥1 ms
Diode test
Measuring voltage:	at 0.5 mA	>2.8V
	at idle	<4V
measuring current	0.5mA
polarity	+ at input A, – at COM
capacity
areas	50nF, 500nF, 5μF, 50μF, 500μF
Display scope	5,000 counting steps
measuring current	500 nA to 0.5 mA, increasing with larger ranges

Advanced multimeter functions
Zero Set	Setting the actual value as a reference value
AutoHold (at A)	Captures a stable measurement result and fixes it on the display. If the measurement result is stable, an acoustic signal sounds. The AutoHold function affects the main measurement display, with thresholds of 1 Vpp for AC signals and 100 mV for DC signals.
Fixed decimal point	Activated by pressing the attenuator buttons

only possible in single-channel mode)

Cursor display (124B and 125B)
Sources	AWAY
Single vertical line	Average, minimum and maximum value display
	Average, minimum and maximum values as well as time since display start (in ROLL mode; measuring device in HOLD mode)
	Minimum and maximum value as well as time since display start (in RECORDER mode; measuring device in HOLD mode)
	Harmonic values in POWER QUALITY mode.
Two vertical lines	Display of peak-to-peak values, time interval and reciprocal time interval
	Display of mean, minimum and maximum values as well as time interval (in ROLL mode; measuring device in HOLD mode)
Two horizontal lines	Display high, low and peak-to-peak values
Rise or fall time	Transition time, 0% and 100% level (manual or automatic level adjustment; automatic level adjustment
accuracy	See Oscilloscope Accuracy

recorder
The recorder captures measured values in multimeter recorder mode or continuously captures sampling points of the waveforms in oscilloscope recorder mode. The information is stored in internal memory or on an optional SD card (on the 125B or 124B).
The results are displayed as a recorder plotting a graph of minimum and maximum values of measurements over time, or as a waveform display showing all sample points acquired.
Measurements
Measuring speed	Maximum 2 measurements/s
Record size (min., max., average)	2 million measured values for 1 channel
Recording period	2 weeks
Maximum number of events	1024
Waveform recording
Maximum sampling rate	400,000 sampling points/s
Recording space internal memory	400 million sampling points
Recording period internal memory	15 minutes at 500 μs/div 11 hours at 20 ms/div
Recording space on the SD card	1.5 billion sample points
Recording period SD card	11 hours at 500 μs/div 14 days at 20 ms/div
Maximum number of events	64

(Fundamental oscillation 40 Hz to 70 Hz)

Power quality (125B only)
Metrics	Active Power (W), Apparent Power (VA), Reactive Power (VAR), Power Factor, Shift Power Factor, Hz
Ranges for W, VA, VAR (Auto)	250W to 250MW, 625MW, 1.56GW
	if selected: Total (% r)	±(2% + 6)
	when selected: fundamental oscillation (% f)	±(4% + 4)
Displacement power factor (DPF)	0.00 to 1.00
Power factor (PF)	0.00 to 1.00, ±0.04
Frequency range	10.0Hz to 15.0kHz 40.0Hz to 70.0Hz
Number of harmonics	DC up to 51st harmonic
Measured values/cursor display	Veff, Aeff, Watt	Each harmonic of a fundamental can be selected for individual display
Includes the frequency of the fundamental wave, the phase angle and the harmonic distortion (in A and W)

Testing physical parameters of industrial bus systems (Fluke 125B only)
Type	subtype	protocol
AS-i	NEN-EN 50295
CAN	ISO-11898
Interbus S	RS-422	EIA-422
Modbus	RS-232	RS-232/EIA-232
Modbus	RS-485	RS-485/EIA-485
Foundation Fieldbus	H1	61158 ,Type 1, 31.25 kbit
Profibus	DP	EIA-485
Profibus	P.A	61158, type 1

7 hours with meter on (screen waveform and setting) (maximum size: 32 GB)
for Windows® (both optional)

Other specifications
Screen	Type	14.5 cm (5.7″) active matrix color TFT
Screen	resolution	640×480 pixels
Waveform display	Vertical	10 div. x 40 pixels
Waveform display	Horizontal	12 Div. x 40 pixels
Power supply	External	Via power supply BC430
	Input voltage	10V DC to 21V DC
	Energy intake	5W typical
	Input port	5mm
	Internal	About battery pack BP290
	Powered by battery	Li-ion battery 10.8 V
	Operating time	7 hours at 50% backlight brightness
	Charging time	4 hours with the meter switched off,
	Permissible ambient temperature	0 to 40°C during charging
Storage	Internal memory can store 20 records	MicroSD card, optional
Mechanical information	Dimensions	259x132x55mm
Mechanical information	Weight	1.4 kg, including battery pack
interface	Optically isolated	Transferring screenshots (bitmaps), settings and data
	Via USB to PC	Optically isolated USB cable OC4USB, uses FlukeView® software
	WLAN adapter (optional)	Quick transfer of screen copies (bitmaps), settings and data to PC/notebook, tablet, smartphone, etc. There is a USB port for connecting the WLAN dongle. For safety reasons, do not use this USB port with a cable.

Group 1, Class AIV, 750 Vrms up to 400 Hz

Environmental conditions
Environmental conditions	MIL-PRF-28800F, Class 2
temperature	Battery operation	0 to 40°C
	Power supply operation	0 to 50°C
	Storage at	-20 to 60°C
Humidity (operation)	at 0 to 10 °C	Not condensing
	at 10 to 30 °C	95%
	at 30 to 40 °C	75%
	at 40 to 50 °C	45%
Storage at	at -20 to 60 °C	Not condensing
Height	Operating at 3,000 m	CAT III 600V
	Operating at 2,000 m	CAT IV 600V
	storage	12,000 m
Electromagnetic compatibility (EMC)	International	IEC 61326-1: Industrial, CISPR 11:
	Korea (KCC)	Class A Equipment (Industrial Broadcasting and Communications Equipment)
	United States (FCC)	47 CFR 15, Subpart B. This product is exempt under clause 15.103.
Wireless radio transmission with WLAN adapter	Frequency range	2412MHz to 2462MHz
Wireless radio transmission with WLAN adapter	Output power	<100mW
IP protection rating of the housing	IP 51, according to EN/IEC 60529
Security	Generally	IEC 61010-1: Pollution degree 2
Security	Measurements	IEC 61010-2-033: CAT IV 600V / CAT III 750V
Max. input voltage input A and B	Directly at the input or with measuring lines	600 Vrms CAT IV for load reduction (derating)
	With banana plug to BNC adapter BB120	600 Vrms for load reduction (derating)
	Maximum floating voltage from each connection to ground	600 Vrms CAT

Include:

Fluke 125B portable oscilloscope
Shielded test leads with black ground leads
Test lead, black (for grounding)
Hook clamps (red, blue)
Banana plug to BNC adapter (black, 1 piece)
10:1 voltage probe
AC current clamp i400S
USB angle adapter
WiFi USB adapter*
Switching power supply, adapter/battery charger
Li-ion battery pack
Padded carry bag
Magnetic hanging device
ScopeMeter® software FlukeView® for Windows®
Protective film

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Brand

Fluke

Fluke Corporation

Name: Fluke 125B/S Handheld Digital Oscilloscope (40 MHz)
Brand: Fluke
SKU: 77655

Since its founding in 1948, Fluke has helped define and grow a unique technology market, providing testing and troubleshooting capabilities that have grown to mission critical status in manufacturing and service industries. Every new manufacturing plant, office, hospital, or facility built today represents another potential customer for Fluke products. From industrial electronic installation, maintenance and service, to precision measurement and quality control, Fluke tools help keep business and industry around the globe up and running. Typical customers and users include technicians, engineers, metrologists, medical-device manufacturers, and computer network professionals — people who stake their reputations on their tools, and use tools to help extend their personal power and abilities.

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Fluke 125B/S Handheld Digital Oscilloscope (40 MHz)

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