# B&K Precision 2120C 30 MHz Analog Oscilloscope (Pre-Owned) # B&K Precision 2120C 30 MHz Analog Oscilloscope (Pre-Owned) ## Key Features At A Glance - Dual-trace analog oscilloscopes with bandwidth from 30 MHz to 60 MHz across the series - 5 mV/div vertical sensitivity (1 mV/div at X5) with 10-step 1-2-5 attenuator and vernier adjustment between steps - Calibrated 23-step time base with X10 magnifier; sweep ranges from 0.1 µs/div to 2 s/div (20 ns/div to 5 s/div on 2160C) - Video sync triggering (TV-V and TV-H) for composite video signal work - Alternate and chop dual-trace modes, plus algebraic ADD for sum and difference measurements - Built-in component tester on the 2125C and 2160C for in-circuit checks of resistors, capacitors, inductors, and semiconductors - Built-in 50 MHz frequency counter on the 2121C with 5-digit LED display and auto-ranging from 0.001 Hz to 1 kHz resolution - Delayed time base with Main, Mix, Delay, and X-Y sweep modes on the 2125C and 2160C The B&K Precision 2100C Series is a family of dual-trace analog oscilloscopes designed to deliver continuous real-time waveform display at a price point typically associated with entry-level digital instruments. The series comprises four models — the 2120C, 2121C, 2125C, and 2160C — which share a common dual-trace architecture, 5 mV/div vertical sensitivity, calibrated 23-step time base with X10 magnification, video sync triggering, alternate and chop sweep, and sum/difference capability. Each unit is supplied with two PR-33A X1/X10 probes, an AC power cord, a spare fuse, and an instruction manual. An analog oscilloscope captures voltage waveforms and displays them on a phosphor screen in real time, with no digital sampling or storage between the input signal and the trace. This continuous display behavior is preferred in education, training, audio and low-frequency analog troubleshooting, and any bench environment where a phosphor trace presentation of the signal is valued. The 2100C Series serves these applications with dual-channel viewing, video signal triggering, and an ADD mode that supports algebraic sum and difference measurements between Channel 1 and Channel 2. ## Compare Other Models in This Series The 2100C Series is a four-model family of dual-trace analog oscilloscopes from B&K Precision. All four models share the same dual-trace front-end architecture, 5 mV/div vertical sensitivity, calibrated 23-step time base with X10 magnifier, video sync triggering, alternate/chop dual-trace modes, and sum/difference (ADD) capability — the common platform on which the series is built. Where the models differ is in bandwidth and in the integrated feature added to each unit. The 2120C is the baseline dual-trace 30 MHz instrument. The 2121C adds an integrated 50 MHz frequency counter. The 2125C adds a built-in component tester and delayed time base. Each pre-owned model in the 2100C Series is listed on its own product page with condition-specific pricing and inventory. Select the model that matches your bandwidth and integrated-feature requirement, then choose the condition tier that fits your application. Bandwidth is the first differentiator within the series. The 2120C, 2121C, and 2125C are 30 MHz instruments with a sweep range of 0.1 µs/div to 2 s/div. The 2160C is the 60 MHz model in the series, with an extended sweep range of 20 ns/div to 5 s/div and 12 kV CRT accelerating voltage in place of the 2 kV used in the 30 MHz models. Integrated features are the second differentiator. The 2121C is the only model in the series with a built-in frequency counter (5-digit LED, 0.1 Hz to 50 MHz range, auto-ranging from 0.001 Hz resolution). The 2125C and 2160C carry the built-in component tester for in-circuit checks of resistors, capacitors, inductors, and semiconductors, and both add delayed time base operation with Main, Mix, Delay, and X-Y sweep modes. The 2120C is the baseline configuration without the counter, component tester, or delayed sweep. Model Bandwidth Sweep Time Component Tester **2120C** 30 MHz 0.1 µs/div to 2 s/div No 2121C 30 MHz 0.1 µs/div to 2 s/div No 2125C 30 MHz 0.1 µs/div to 2 s/div Yes 2160C 60 MHz 20 ns/div to 5 s/div Yes Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - Instruction manual - Two PR-33A X1/X10 probes or equivalent - AC power cord - Spare fuse ## Product Core & Specifications Specifications 2120C VERTICAL AMPLIFIERS (CH 1 and CH 2) Sensitivity 5 mV/div to 5 V/div, 1 mV/div to 1 V/div at X5 Attenuator 10 steps in 1-2-5 sequence. Vernier control provides full adjustment between steps Accuracy ±3%, ±5% at X5 Input Impedance 1 MΩ ±2% Input Capacitance 25 pF ±10 pF Frequency Response 5 mV to 5 V/div: DC to 30 MHz (-3dB). X5: DC to 10 MHz (-3dB) Rise Time 12 ns (Overshoot ≤5%) Operating Modes CH 1 single trace; CH 2 single trace; ALT dual trace, alternating; CHOP dual trace, chopped; ADD algebraic sum of CH 1 + CH 2 Polarity Reversal CH 2 only Max. Input Voltage 400 V (DC + AC peak) SWEEP SYSTEM Sweep Speed 0.1 µs/div to 2 s/div in 1-2-5 sequence, 23 steps, Vernier control provides fully adjustable sweep time between steps. Accuracy ±3% Sweep Magnification 10x ±10% TRIGGERING Triggering Modes AUTO (free run) or NORM, TV-V, TV-H Trigger Source CH 1, CH 2, ALT, EXT, LINE Max External Trigger Voltage 300 V (DC + AC peak) Trigger Coupling AC 30 Hz to 30 MHz TV H Used for triggering from horizontal sync pulses TV V Used for triggering from vertical sync pulses TRIGGER SENSITIVITY Auto Bandwidth: 100 Hz-30 MHz, Internal: 1.5 div, External: ≥0.5Vp-p Norm Bandwidth: DC to 30 MHz, Internal: 1.5 div, External: ≥0.5Vp-p TV V Bandwidth: 20 Hz-1 kHz, Internal: 1.0 div, External: ≥0.5Vp-p TV H Bandwidth: 1 kHz-100 kHz, Internal: 1.0 div, External: ≥0.5Vp-p HORIZONTAL AMPLIFIER (Input through channel 1 input) X-Y Mode Switch selectable using X-Y switch. CH 1: X axis, CH 2: Y axis Sensitivity Same as vertical channel 2 Input Impedance Same as vertical channel 2 Frequency Response DC to 1 MHz typical (-3 dB) X-Y Phase Difference Approximately 3° at 50 kHz Maximum Input Voltage Same as vertical channel 2 CRT Type Rectangular with internal graticule Display Area 8 x 10 div (1 div = 1 cm) Accelerating Voltage 2 kV Phosphor P31 Trace Rotation Electrical, front panel adjustable Calibrating Voltage 1 kHz (±10%) positive square wave, 2 V p-p (±3%) GENERAL Temperature Within specified accuracy: 50° to 95°F (10° to 35°C), 10-80% RH. Full operation: 32° to 122°F (0° to 50°C), 10-80% RH. Storage: -22° to 158°F (-30° to +70°C), 10-90% RH AC Input 100/120/220/240 VAC ±10%, 50/60 Hz, approximately 40 W Dimensions (WxHxD) 7 x 14.5 x 17.25" (180 x 370 x 440 mm) Weight 16.8 lbs (7.6 kg) Warranty One Year Warranty **Important:** Maximum input voltage: 400 V (DC + AC peak). Maximum external trigger voltage: 300 V (DC + AC peak).Recommended pairing: the PR-32A demodulator probe, PR-37A X1/X10/REF probe, PR-100A X100 probe, PR-55 high-voltage X1000 probe, and LC-210A carrying case are listed as optional accessories for the 2100C Series. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - 245.0 USD - **Vendor:** B&K Precision - **Type:** Oscilloscope - **Tags:** Analog, BK Precision, Manufacturers, Oscilloscopes, product_manual_group_3, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 175.00 USD | In stock | | NIST Traceable with Full Data | 210.00 USD | In stock | | ISO IEC 17025 Accredited | 245.00 USD | In stock | ## Images - B&K Precision 2120C 30 MHz Analog Oscilloscope (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/2120c-b-k-precision-analog-oscilloscope-used) > Updated: 2026-05-30