Fluke 120B Series Industrial ScopeMeter handheld Oscilloscopes

Product By Flir Logo

Simplified testing, more insight and faster electro-mechanical troubleshooting

The compact ScopeMeter® 120B Series, is the rugged oscilloscope solution for industrial electrical and electro-mechanical 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 ScopeMeter 120B Series also integrates with Fluke Connect® mobile app and FlukeView® for ScopeMeter software to enable further collaboration, data analysis and archiving of critical test information.

*Not all models are available in all countries. Check with your local Fluke representative.

Other useful features:

  • Features two 5,000-count True-RMS digital multimeters
  • Offers recorder Event Detect to capture elusive intermittent signals on repetitive waveforms up to 4 kHz
  • Comes with shielded test leads for oscilloscope, resistance and continuity measurements
  • Features resistance, continuity, diode, and capacitance meter measurements
  • Performs power measurements (W, VA, VAR, PF, DPF, Hz)
  • Measures voltage, current and power harmonics
  • Check Industrial networks with BusHealth physical layer tests against defined reference levels (125B only)
  • Allows you to save and recall data and instrument setups
  • Includes FlukeView® ScopeMeter® software for Windows®
  • Features a rugged design to withstand 3g vibration, 30g shock, and rated IP51 according to EN/IEC60529
  • Runs on a Li-Ion rechargeable battery providing seven-hours operation (with four-hour charge time)
  • Features highest safety rating in the industry: safety rated for CAT IV 600 V
Oscilloscope mode
Frequency response - dc coupledWithout 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 leadsDC to 12.5 MHz (-3 dB) / dc to 20 MHz (-6 dB)
With VP41 10:1 Probe123B: 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 impedanceWithout probes and test leads1 M?//20 pF
With BB1201 M?//24 pF
With STL120-IV 1:1 shielded test leads1 M?//230 pF
With VP41 10:1 Probe5 M?//15.5 pF
Sensitivity5 mV to 200 V/div
Analog bandwidth limiter10 kHz
Display modesA, -A, B, -B
Max. input voltage A and BDirect, with test leads, or with VP41 Probe600 Vrms Cat IV, 750 Vrms maximum voltage.
With BB120600 Vrms
Max. floating voltage, from any terminal to ground600 Vrms Cat IV, 750 Vrms up to 400Hz
Scope modesNormal, Single, Roll
Ranges (normal)Equivalent sampling123B: 20 ns to 500 ns/div,
124B and 125B: 10 ns to 500 ns/div
Real time sampling1 ?s to 5 s/div
Single (real time)1 ?s 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 ?s to 60 s/div40 MS/s
Screen updateFree run, on trigger
SourceA, B
Sensitivity A and B@ DC to 5 MHz0.5 divisions or 5 mV
@ 40 MHz123B: 4 divisions
124B and 125B: 1.5 divisions
@ 60 MHz123B: N/A
124B and 125B: 4 divisions
SlopePositive, negative
Advanced scope functions
Display modesNormalCaptures up to 25 ns glitches and displays analog-like persistence waveform
SmoothSuppresses noise from a waveform
Glitch offDoes not capture glitches between samples
EnvelopeRecords 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)
Ranges500 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 reading5000 counts
True-rms voltages (V ac and V ac+dc)
Ranges500 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 reading5000 counts, reading is independent of any signal crest factor.
ModesMax peak, Min peak, or pk-to-pk
Ranges500 mV, 5 V, 50 V, 500 V, 2200 V
AccuracyAccuracy Max peak or Min peak5% of full scale
Accuracy Peak-to-Peak10% of full scale
Full scale reading500 counts
Frequency (Hz)
Ranges123B: 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 range15 Hz (1 Hz) to 50 MHz in continuous autoset
Accuracy @1 Hz to 1 MHz±(0.5% +2 counts)
Full scale reading10,000 counts
Max reading50.00 kRPM
Accuracy±(0.5% +2 counts)
Duty cycle (PULSE)
Range2% to 98%
Frequency range15 Hz (1 Hz) to 30 MHz in continuous autoset
Pulse width (PULSE)
Frequency range15 Hz (1 Hz) to 30 MHz in continuous autoset
Full scale reading1000 counts
Amperes (AMP)
With current clampRangesSame as V dc, V ac, V ac+dc, or PEAK
Scale factors0.1 mV/A, 1 mV/A, 10 mV/A, 100 mV/A, 400 mV/A, 1 V/A, 10 mV/mA
AccuracySame as V dc, V ac, V ac+dc, or PEAK (add current clamp uncertainty)
Temperature (TEMP) with optional temperature probe
Range200 °C/div (200 °F/div)
Scale factor1 mV/°C and 1 mV/°F
AccuracyAs V dc (add temp. probe uncertainty)
Decibel (dB)
0 dBV1 V
0 dBm (600 ? /50 ?)1 mW referenced to 600 ? or 50 ?
dB onV dc, V ac, or Vac+dc
Full scale reading1000 counts
Crest factor (CREST)
Range1 to 10
Full scale reading90 Counts
ModesA to B, B to A
Range0 to 359 degrees
Resolution1 degree
Power (125B only)
Configurations1 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
WattRMS reading of multiplying corresponding samples of input A (volts) and input B (amperes)
Full scale reading999 counts
VAVrms x Arms
Full scale reading999 counts
VA reactive (var)?((VA)2-W2)
Full scale reading999 counts
PurposeTo measure on pulse width modulated signals, like motor drive inverter outputs
PrincipleReadings show the effective voltage based on the average value of samples over a whole number of periods of the fundamental frequency
AccuracyAs Vrms for sinewave signals
Input A to common
Ohm (?)
Ranges123B and 124B500 ? , 5 k?, 50 k?, 500 k?, 5 M?, 30 M?
125B50 ?, 500 ? , 5 k?, 50 k?, 500 k?, 5 M?, 30 M?
Accuracy±(0.6% + 5 counts) 50 ? ±(2% + 20 counts)
Full scale reading50 ? to 5 M? - 5000 counts, 30 M? - 3000 counts
Measurement current0.5 mA to 50 nA, decreases with increasing ranges
Open circuit voltage<4 V
Continuity (Cont)
Beep<(30 ? ±5 ?) in 50 ? range
Measurement current0.5 mA
Detection of shorts of?1 ms
Measurement voltage@0.5 mA>2.8 V
@open circuit<4 V
Measurement current0.5 mA
Polarity+ on input A, - on COM
Capacitance (CAP)
Ranges50 nF, 500 nF, 5 ?F, 50 ?F, 500 ?F
Full scale reading5000 counts
Measurement current500 nA to 0.5 mA, increases with increasing ranges
Advanced meter functions
Zero SetSet 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 pointActivated by using attenuation keys
Cursor Readout (124B and 125B)
SourcesA, B
Single vertical lineAverage, 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 linesPeak-peak, time distance and reciprocal time distance readout
Average, min, max and time distance readout (in ROLL mode; instrument in HOLD)
Dual horizontal linesHigh, low and peak-peak readout
Rise or fall timeTransition time, 0%-level and 100%-level readout (manual or auto leveling; auto leveling only 
possible in single channel mode)
AccuracyAs 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 SpeedMaximum 2 measurement/s
Record Size (min, max, average)2 M readings for 1 channel
Recorded Time Span2 weeks
Maximum number of events1024
Waveform record
Maximum sample rate400 K sample/s
Size Internal memory400 M samples Recorded Time
Span internal memory15 minutes at 500 ?s/div
11 hours at 20 ms/div
Record Size SD card1.5 G samples
Recorded Time Span SD card11 hours at 500 ?s/div
14 days at 20 ms/div
Maximum number of events64
Power Quality (125B only)
ReadingsWatt, 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)
DPF0.00 to 1.00
PF0.00 to 1.00, ±0.04
Frequency range10.0 Hz to 15.0 kHz
40.0 Hz to 70.0 Hz
Number of HarmonicsDC to 51
Readings / Cursor readings 
(fundamental 40 Hz to 70 Hz)
Vrms / Arms /WattEach 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)
Interbus SRS-422EIA-422
Foundation FieldbusH161158 type 1, 31.25 kBit
PA61158 type 1
DisplayType5.7-inch color active matrix TFT
Resolution640 x 480 pixels
Waveform DisplayVertical10 div of 40 pixels
Horizontal12 div of 40 pixels
PowerExternalVia Power Adapter BC430
Input voltage10 V DC to 21 V DC
Power consumption5 W typical
Input connector5 mm jack
InternalVia Battery Pack BP290
Battery powerRechargeable Li-Ion 10.8 V
Operating time7 hours with 50% backlight brightness
Charging time4 hours with test tool off,  7 hours with test tool on
Allowable ambient temp0 to 40 °C (32 to 104 °F) during charging
MemoryInternal memory can store 20 data sets  (screen waveform and setup)Micro SD card slot with optional SD card  (max size of 32 GB)
MechanicalSize259 x 132 x 55 mm 
(10.2 x 5.2 x 2.15 in)
Weight1.4 kg (3.2 lb) including battery pack
InterfaceOptically isolatedTransfer screen copies (bitmaps), settings and data
USB to PC/laptopOC4USB optically isolated USB adapter/cable, (optional), using FlukeView® software for Windows®.
Optional WiFi adapterFast 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.
EnvironmentalMIL-PRF-28800F, Class 2
TemperatureBattery Operation0 to 40 °C (32 to 104 °F)
Power Adapter Operation0 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
AltitudeOperating at 3 km (10,000 feet)CAT III 600 V
Operating at 2 km (6,600 feet)CAT IV 600 V
Storage12 km (40,000 feet)
EMC electromagnetic compatibilityInternationalIEC 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 adapterFrequency range2412 MHz to 2462 MHz
Output power<100 mW
Enclosure protectionIP51, ref: EN/IEC60529
SafetyGeneralIEC 61010-1: Pollution Degree 2
MeasurementIEC 61010-2-033: CAT IV 600 V/CAT III 750 V
Max. input voltage input A and BDirect on input or with leads600 Vrms CAT IV for derating
With Banana-to-BNC Adapter BB120600 Vrms for derating
Max. floating voltage from any terminal to ground600 Vrms Cat IV, 750 Vrms up to 400 Hz