Fluke 123B 20 MHz Industrial ScopeMeter


Key Features:

  • 20 MHz oscilloscope bandwidth
  • Dual channel digital oscilloscope
  • Two high resolution true-rms digital multimeters
  • Connect-and-View™ trigger technology for quick operation
  • IntellaSet technology Automatically adjust numerical sugnal readout
  • 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
  • Save or recall data and instrument setups
  • Shielded test leads for oscilloscope, resistance and continuity measurements
  • Resistance, continuity, diode and capacitance meter measurements
  • 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
  • Wirelessly transfer information to the PC, laptop or Fluke Connect® mobile app*
  • 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)
Product Options:

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The Fluke 123B is a dual channel, 20 MHz bandwidth, Hand-Held Industrial ScopeMeter designed on the foundation of innovation and efficiency. The Connect-and-View trigger and setup technology displays color waveforms, while the Fluke IntellaSet technology allows for the automatic view of related numerical measurements. Now, technicians can troubleshoot in an exponentially shorter time span and are no longer burdened with making manual measurement adjustments.

 The Fluke 123B replaces the popular Fluke 123 Scopemeter.


The Connect-and-View triggering technology identifies signal patterns, sets up the correct triggering to automatically provide a stable reliable repeatable display.


Dual Input

Measure AC & DC RMS Voltage on channel A and AC & DC RMS Current on channel B


Comprehensive Recorder Modes

Plot the minimum and maximum peak measurement values, record waveform trace to identify and troubleshoot intermittent faults


Measure Multiple Electrical Parameters

Meter, high frequency waveform, resistance and capacitance measurements in addition to continuity checks are all reported by a single set of test leads.


Fluke Connect

Fluke Connect is the most comprehensive software and wireless test tools family that keeps you in contact with your entire team without leaving the field. The Fluke Connect software is compatible with the iPhone models 4S and higher running iOS 8.0 or higher, iPad Air and iPad Mini (2nd generation) in an iPhone frame on iPad and iPod Touch (5th generation), HTC One and One M8 running Android 4.4.x or higher, LG G3 and Nexus 5 running Android 4.4.x or higher, Samsung Galaxy S4 running Android 4.3.x or higher, Samsung Galaxy S5 running Android 4.4.x or higher and works with now over 30 different Fluke products. The Fluke Connect family offers the largest system of connected test tools in the world.  Please see out Fluke Connect category for the complete collection of Fluke Connect Products. 

 Take me to Fluke Connect (Click Here).


  • Fluke 123B Hand-Held Oscilloscope
  • Shielded Test Leads with Black Ground Leads
  • Test Lead Black (for Grounding)
  • Hook Clips (red, blue)
  • Banana-to-BNC Adapters (black, x1)
  • USB Angled Adapter
  • WiFi USB Adapter*
  • Switch Mode Power Supply, Adapter/Battery Charger
  • Rechargeable Li-ion Battery Pack

Oscilloscope mode


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 20MHz (-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


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

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)

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


A, B

Sensitivity A and B

@ DC to 5 MHz

0.5 divisions or 5 mV

@ 40 MHz

4 divisions


Positive, negative


Advanced scope functions

Display modes


Captures up to 25 ns glitches and displays analog-like persistence waveform


Suppresses noise from a waveform

Glitch off

Does not capture glitches between samples


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)


500 mV, 5 V, 50 V, 500 V, 750 V


±(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)


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.



Max peak, Min peak, or pk-to-pk


500 mV, 5 V, 50 V, 500 V, 2200 V


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)


1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz,1 MHz, 10 MHz, and 50 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


±(0.5% +2 counts)

Duty cycle (PULSE)


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


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


Same as V dc, V ac, V ac+dc, or PEAK (add current clamp uncertainty)

Temperature (TEMP) with optional temperature probe


200 °C/div (200 °F/div)

Scale factor

1 mV/°C and 1 mV/°F


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)


1 to 10

Full scale reading

90 Counts



A to B, B to A


0 to 359 degrees


1 degree



To measure on pulse width modulated signals, like motor drive inverter outputs


Readings show the effective voltage based on the average value of samples over a whole number of periods of the fundamental frequency


As Vrms for sinewave signals


Input A to common

Ohm (Ω)



500 Ω , 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ


±(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)


<(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


+ on input A, - on COM

Capacitance (CAP)


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



The recorder captures meter readings in Meter Recorder mode or continuously captures waveform samples in Scope Recorder mode.

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


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






5.7-inch color active matrix TFT


640 x 480 pixels

Waveform Display


10 div of 40 pixels


12 div of 40 pixels



Via Power Adapter BC430

Input voltage

10 V DC to 21 V DC

Power consumption

5 W typical

Input connector

5 mm jack


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


Internal memory can store 20 data sets  (screen waveform and setup)

Micro SD card slot with optional SD card  (max size of 32 GB)



259 x 132 x 55 mm 
(10.2 x 5.2 x 2.15 in)


1.4 kg (3.2 lb) including battery pack


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.




MIL-PRF-28800F, Class 2


Battery Operation

0 to 40 °C (32 to 104 °F)

Power Adapter Operation

0 to 50 °C (32 to 122 °F)


-20 to 60 °C (-4 to 140 °F)

Humidity (Operating)

@ 0 to 10 °C (32 to 50 °F)


@ 10 to 30 °C (50 to 86 °F)


@ 30 to 40 °C (86 to 104 °F)


@ 40 to 50 °C (104 to 122 °F)



@ -20 to 60 °C (-4 to 140 °F)



Operating at 3 km (10,000 feet)


Operating at 2 km (6,600 feet)

CAT IV 600 V


12 km (40,000 feet)

EMC electromagnetic compatibility


IEC 61326-1: Industrial, CISPR 11:  Group 1, Class A

Korea (KCC)

Class A Equipment (Industrial Broadcasting & Communication Equipment)


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



IEC 61010-1: Pollution Degree 2


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

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