Industrial ScopeMeter Hand-Held Oscilloscope, 20 MHz bd

Work with confidence with this oscilloscope that offers simplified testing, more insight, faster electro-mechanical troubleshooting, and comes with 20 MHz of bandwidth. Conveniently provides full-function dual input scope and meter measurements.

Fluke 123B Offers

Compact and rugged, this oscilloscope is ideal for industrial electrical and electro-mechanical equipment troubleshooting and maintenance applications. Features innovative functions that help technicians troubleshoot faster for quicker results and to keep their systems running smoothly. Additionally, triggering displays waveforms without having to adjust amplitude, timebase, and trigger settings.


Key measurements: Power waveforms with numerical values including resistance, diode, continuity and capacitance measurements
Automatically capture, view and analyze complex waveforms: Fluke Connect and View™ triggering automatically displays waveforms without having to adjust amplitude, timebase and trigger settings, while Intellaset™ technology analyzes the signal and automatically displays critical numerical readings, making troubleshooting faster than ever
View data locally on the instrument, or via Fluke Connect mobile app
Dual-input digital oscilloscope and multimeter
20 MHz oscilloscope bandwidth
Two 5000-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 4 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)
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
Rugged design to withstand 3 g Vibration, 30 g shock, and rated IP51 according to EN/IEC60529
Highest safety rating in the industry: safety rated for CAT IV 600 V
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. This instrument’s unique Connect-andView 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.


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 the 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 this industrial ScopeMeter can measure AC+DC RMS voltage on channel A and AC+DC RMS current on channel B.

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 a single set of shielded test leads. No time is wasted finding or swapping leads.

Fluke Connect mobile app compatibility

Automated industrial machinery is harder than ever to troubleshoot. 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. This 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.

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 event. 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 them. But, your ScopeMeter test tool 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.


Ideal for industrial electrical and electro-mechanical equipment troubleshooting and maintenance applications.



Oscilloscope Mode (Vertical)
Frequency Response – DC Coupled Without probes and test leads (with BB120): DC to 20 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: DC to 20 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 <17.5 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
Maximum 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
Maximum Floating Voltage, from any Terminal to Ground 600 Vrms CAT IV, 750 Vrms up to 400 Hz
Oscilloscope Mode (Horizontal)
Scope Modes Normal, single, roll
Ranges (Normal) Equivalent sampling: 20 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): 1 s 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 At DC to 5 MHz: 0.5 divisions or 5 mV
At 40 MHz: 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
Input A and B
DC Voltage (V DC) Ranges: 500 mV, 5, 50, 500, 750 V
Accuracy: ±(0.5% +5 counts)
Common mode rejection (CMRR): >100 dB at DC, >60 dB at 50, 60, or 400 Hz
Full scale reading: 5000 counts
True RMS Voltages (V AC and V AC+DC) Ranges: 500 mV, 5, 50, 500, 750 V
Accuracy for 5 to 100% of range (DC coupled)
DC to 60 Hz (V AC + DC): ±(1% +10 counts)
1 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 V AC): >50 dB
Common mode rejection (CMRR): >100 dB at DC; >60 dB at 50, 60, or 400 Hz
Full scale reading: 5000 counts, reading is independent of any signal crest factor

Peak Modes: Maximum peak, minimum peak, peak-to-peak
Ranges: 500 mV, 5, 50, 500, 2200 V
Accuracy: Maximum peak or minimum peak: 5% of full scale; peak-to-peak: 10% of full scale
Full scale reading: 500 counts
Frequency Ranges: 1, 10, 100 Hz, 1, 10, 100 kHz, 1, 10, and 50 MHz
Frequency range: 15 Hz (1 Hz) to 50 MHz in continuous autoset
Accuracy at 1 Hz to 1 MHz: ±(0.5% +2 counts)
Full scale reading: 10,000 counts
RPM Maximum reading: 50 kRPM
Accuracy: ±(0.5% +2 counts)
Duty Cycle Range: 2 to 98%
Frequency range: 15 Hz (1 Hz) to 30 MHz in continuous autoset
Pulse Width Frequency range: 15 Hz (1 Hz) to 30 MHz in continuous autoset
Full scale reading: 1000 counts
Amperes With current clamp
Ranges: same as V DC, V AC, V AC+DC, or peak
Scale factors: 0.1, 1, 10, 100, 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)
Decibel 0 dBV: 1 V
0 dBm (600/50 Ω): 1 mW referenced to 600 or 50 Ω
dB on V DC, V AC, or V AC+DC
Full scale reading; 1000 counts
Crest Factor Range: 1 to 10
Full scale reading: 90 counts
Phase Modes: A to B, B to A
Range: 0 to 359°
Resolution: 1°
Vpwm 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 sine wave signals
Input A to Common
Ohm Ranges: 500 Ω, 5, 50, 500 kΩ, 5, 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
Common Continuity (Cont) Beep: <(30 Ω ±5 Ω) in 50 Ω range
Measurement current: 0.5 mA
Detection of shorts of: ≥1 ms
Common Diode Measurement voltage: At 0.5 mA: >2.8 V
At open circuit: <4 V
Measurement current: 0.5 mA
Polarity: + on input A, – on COM
Capacitance (CAP) Ranges: 50, 500 nF, 5, 50, 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
Meter Readings Measurement speed: Maximum 2 measurements
Record size (minimum, maximum, average): 2 M readings for 1 channel
Recorded time span: 2 weeks
Maximum number of events: 1024
Waveform Record Maximum sample rate: 400 K samples
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
General Specifications
Waveform Display Vertical: 10 div of 40 pixels
Horizontal: 12 div of 40 pixels
Maximum Input Voltage 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
Maximum floating voltage from any terminal to ground: 600 Vrms CAT IV, 750 Vrms up to 400 Hz
Display Type: 5.7″ color active martrix TFT
Resolution: 640 x 480
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®
Wireless Radio with Adapter Frequency range: 2412 to 2462 MHz
Output power: <100 mW
Environmental MIL-PRF-28800F, Class 2
Temperature Battery operation: 32 to 104°F (0 to 40°C)
Power adapter operation: 32 to 122°F (0 to 50°C)
Storage: -4 to 140°F (-20 to 60°C) non-condensing
Humidity (Operating) At 32 to 50°F (0 to 10°C): non-condensing
At 50 to 86°F (10 to 30°C): 95%
At 86 to 104°F (30 to 40°C): 75%
At 104 to 122°F (40 to 50°C): 45%
Altitude Operating at 10,000′ (3 km): CAT III 600 V
Operating at 6600′ (2 km): CAT IV 600 V
Storage: 40,000′ (12 km)
EMC Electromagnetic Compatibility USA (FCC): 47 CFR 15 subpart B (this product is considered an exempt device per clause 15.103)
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
Memory Internal memory can store 20 data sets (screen waveform and setup)
Micro SD card slot with optional SD card (maximum size of 32 GB)
Power External: Via power adapter BC430
Input voltage: 10 to 21 V DC 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 temperature: 32 to 104°F (0 to 40°C) during charging
Dimensions 10.2 x 5.2 x 2.15″ (259 x 132 x 55 mm)
Weight 3.2 lbs (1.4 kg) including battery pack



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