
Fluke 120B Series Industrial ScopeMeter® handheld Oscilloscopes
Pricing
Request a quote
We reply within 24 hours
Product Description
The Fluke 120B Series is a handheld digital oscilloscope for industrial electrical & electro-mechanical equipment troubleshooting & maintenance.
Technical Specifications
- Manufacturer part number (MPN)
- 4755829 Brand: Fluke Category: Tools Without probes and test leads (with BB120): 123B: dc to 20 MHz (-3 dB) 124B and 125B: dc to 40 MHz (-3 dB) Without probes and test leads: <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 Input impedance With BB120: 1 MΩ//24 pF Sensitivity: 5 mV to 200 V/div analogue bandwidth limiter: 10 kHz Display modes: A, -A, B, -B Direct, with test leads, or with VP41 Probe: 600 Vrms Cat IV, 750 Vrms maximum voltage. Max. input voltage A and B 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, Ranges (normal) Real time sampling: 1 μs to 5 s/div Ranges (normal) Single (real time): 1 μs to 5 s/div Ranges (normal) Roll (real time): 1s to 60 s/div 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 Sensitivity A and B @ 40 MHz: 123B: 4 divisions Sensitivity A and B @ 60 MHz: 123B: N/A Sensitivity A and B Slope: Positive, negative Display modes Normal: Captures up to 25 ns glitches and displays analogue-like persistence waveform Display modes Smooth: Suppresses noise from a waveform Display modes Glitch off: Does not capture glitches between samples Display modes 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. 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 DC to 60 Hz (V ac+dc): ±(1% +10 counts) 1 Hz to 60 Hz (V ac): ±(1% +10 counts) 60 Hz to 20 kHz: ±(2.5% +15 counts) DC rejection (only VAC): >50 dB Modes: Max peak, Min peak, or pk-to-pk Accuracy Accuracy Max peak or Min peak: 5% of full scale Accuracy Accuracy Peak-to-Peak: 10% of full scale Frequency range: 15 Hz (1 Hz) to 50 MHz in continuous autoset Accuracy @1 Hz to 1 MHz: ±(0.5% +2 counts) Max reading: 50.00 kRPM Range: 2% to 98% With current clamp Ranges: Same as V dc, V ac, V ac+dc, or PEAK With current clamp Scale factors: 0.1 mV/A, 1 mV/A, 10 mV/A, 100 mV/A, 400 mV/A, 1 V/A, 10 mV/mA With current clamp Accuracy: Same as V dc, V ac, V ac+dc, or PEAK (add current clamp uncertainty) Scale factor: 1 mV/°C and 1 mV/°F 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 Resolution: 1 degree 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) VA: Vrms x Arms VA reactive (var): √((VA)2-W2) 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 Ranges 123B and 124B: 500 Ω , 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ Ranges 125B: 50 Ω, 500 Ω , 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ Measurement current: 0.5 mA to 50 nA, decreases with increasing ranges Open circuit voltage: <4 V Beep: <(30 Ω ±5 Ω) in 50 Ω range Detection of shorts of: ≥1 ms Measurement voltage @0.5 mA: >2.8 V Measurement voltage @open circuit: <4 V Polarity: + on input A, - on COM 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 Sources: A, B Single vertical line: Average, min and max readout Dual vertical lines: Peak-peak, time distance and reciprocal time distance readout 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) 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 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 Readings: Watt, VA, var, PF, DPF, Hz Watt, VA, var ranges (auto): 250 W to 250 MW, 625 MW, 1.56 GW DPF: 0.00 to 1.00 PF: 0.00 to 1.00, ±0.04 Number of Harmonics: DC to 51 Vrms / Arms /Watt: Each harmonic from fundamental maybe selected for individual readings Type Subtype: Protocol AS-i: NEN-EN50295 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 PA: 61158 type 1 Display Type: 5.7-inch color active matrix TFT Display Resolution: 640 x 480 pixels Waveform Display Vertical: 10 div of 40 pixels Waveform Display Horizontal: 12 div of 40 pixels Power External: Via Power Adapter BC430 Power Input voltage: 10 V DC to 21 V DC Power Power consumption: 5 W typical Power Input connector: 5 mm jack Power Internal: Via Battery Pack BP290 Power Battery power: Rechargeable Li-Ion 10.8 V Power Operating time: 7 hours with 50% backlight brightness Power Charging time: 4 hours with test tool off, 7 hours with test tool on Power Allowable ambient temp: 0 to 40 °C (32 to 104 °F) during charging Mechanical Size: 259 x 132 x 55 mm (10.2 x 5.2 x 2.15 in) Mechanical Weight: 1.4 kg (3.2 lb) including battery pack Interface Optically isolated: Transfer screen copies (bitmaps), settings and data Interface USB to PC/laptop: OC4USB optically isolated USB adapter/cable, (optional), using FlukeView® software for Windows®. Interface 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) Temperature Power Adapter Operation: 0 to 50 °C (32 to 122 °F) Temperature Storage: -20 to 60 °C (-4 to 140 °F) Humidity (Operating) @ 0 to 10 °C (32 to 50 °F): Non-condensing Humidity (Operating) @ 10 to 30 °C (50 to 86 °F): 95% Humidity (Operating) @ 30 to 40 °C (86 to 104 °F): 75% Humidity (Operating) @ 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 Altitude Operating at 2 km (6,600 feet): CAT IV 600 V Altitude Storage: 12 km (40,000 feet) EMC electromagnetic compatibility International: IEC 61326-1: Industrial, CISPR 11: Group 1, Class A EMC electromagnetic compatibility Korea (KCC): Class A Equipment (Industrial Broadcasting & Communication Equipment) EMC electromagnetic compatibility 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 Wireless radio with adapter Output power: <100 mW Enclosure protection: IP51, ref: EN/IEC60529 Safety General: IEC 61010-1: Pollution Degree 2 Safety Measurement: IEC 61010-2-033: CAT IV 600 V/CAT III 750 V Direct on input or with leads: 600 Vrms CAT IV for derating With Banana-to-BNC Adapter BB120: 600 Vrms for derating
Standards & Compliance
- HS Code
- 9030.20
Cross References
- OEM-URL https://www.fluke.com/en-us/product/electrical-testing/portable-oscilloscopes/120b
Product Documentation
More from Fluke

Fluke
Fluke 721EX Precision Pressure Calibrator
4353420

Fluke
Fluke Calibration P3000 Pneumatic Deadweight Testers
4184776

Fluke
Fluke CV301 75 mm (3 in) Infrared Window
4338164

Fluke
Fluke Calibration 9100S Handheld Dry-Well
1885080

Fluke
Fluke 1555 FC 10 kV Insulation Tester Kit
4977469

Fluke
VPS212-G - Voltage Probe Set, 10:1, one grey
FLUKE-VPS212-G

Fluke
Fluke 1587/I400 Current Clamp FC Kit
4692725

Fluke
Fluke 1587/MDT FC Advanced Motor and Drive Troubleshooting Kit
4692716
Catalogue entry last verified: 2026-10-03. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 4755829?
- 4755829 can be ordered from cballast.com as a Fluke catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this Fluke product?
- The manufacturer part number is 4755829.
- What is the HS code for 4755829?
- The customs tariff (HS) code for 4755829 is 9030.20.
- Who manufactures 4755829?
- 4755829 is a Fluke product in the Safety & Detection range.
- Is a datasheet available for 4755829?
- Yes — the 4755829 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 4755829?
- The minimum order quantity is 1.
- Is 4755829 available?
- Yes — 4755829 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).
