BK Precision 2120B 20MHz Dual Trace Oscilloscope

The BK Precision 2120B is a dual-trace analog oscilloscope designed for electronics testing, design, and repair applications. It offers a 30 MHz bandwidth and features dual or single trace operation with selectable alternate or chop sweep modes. The oscilloscope provides versatile triggering options, including AUTO, NORM, TV-V, and TV-H modes, with trigger sources such as CH 1, CH 2, ALT, EXT, and LINE. Its high sensitivity and calibrated voltage and time measurements facilitate detailed waveform analysis.

### Technical Specifications

**Vertical Amplifiers (CH 1 and CH 2)**

* **Sensitivity:**
* 5 mV/div to 5 V/div
* 1 mV/div to 1 V/div at X5 MAG
* **Attenuator:** 10 calibrated steps in 1-2-5 sequence, with vernier control for continuous adjustment between steps.
* **Accuracy:** ±3% (5 mV/div to 5 V/div); ±5% at X5 MAG.
* **Input Resistance:** 1 MΩ ±2%.
* **Input Capacitance:** 25 pF ±10 pF.
* **Frequency Response:**
* DC to 30 MHz (−3 dB) for 5 mV/div to 5 V/div.
* DC to 10 MHz (−3 dB) at X5 MAG.
* **Rise Time:** 12 ns (≤5% overshoot). For X5 MAG, rise time is 35 ns.
* **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:** Available on CH 2 only.
* **Maximum 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%).
* **Holdoff:** Continuously adjustable for main time base from NORM to 5 times normal.

**Triggering**

* **Triggering Modes:** AUTO (free run) or NORM, TV-V, TV-H.
* **Trigger Source:** CH 1, CH 2, ALT, EXT, LINE.
* **Maximum 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 100 mV.
* NORM: Bandwidth DC to 30 MHz, Internal 1.5 div, External 100 mV.
* TV-V: Bandwidth 20 Hz – 1 kHz, Internal 0.5 div, External 100 mV.

**CRT Display**

* **Type:** 6-inch rectangular CRT with integral graticule and P31 phosphor.
* **Display Area:** 8 x 10 divisions (1 div = 1 cm).
* **Accelerating Voltage:** 2 kV.
* **Trace Rotation:** Electrical, front panel adjustable.

**X-Y Operation**

* **CH 1 Input:** X-axis.
* **CH 2 Input:** Y-axis.
* **Sensitivity:** Same as vertical channel 2.
* **Input Impedance:** Same as vertical channel 2 (1 MΩ ±2%).
* **Frequency Response:** DC to 1 MHz (−3 dB).
* **X-Y Phase Difference:** 3° or less at 50 kHz.
* **Maximum Input Voltage:** Same as vertical channel 1.

**General Specifications**

* **Power Requirements:** 100–130 VAC or 200–260 VAC, 50/60 Hz, 38 watts.
* **Dimensions (H x W x D):** 5.2″ x 12.8″ x 15.7″ (132 mm x 324 mm x 398 mm).
* **Weight:** 16.8 lbs (7.6 kg).
* **Operating Environment:**
* Within Specified Accuracy: +10° to +35° C, 10–80% relative humidity.
* Full Operation: 0° to +50° C, 10–80% relative humidity.
* Storage: −30° to +70° C, 10–90% relative humidity.
* **Cal/Probe Compensation Voltage:** 2 V p-p ±3% square wave, 1 kHz nominal.

### Why Choose Aumictech for BK Precision 2120B?

At Aumictech, we specialize in supplying high-performance test and measurement equipment. Whether you need reliable electronics analysis, precise waveform characterization, or robust troubleshooting tools, our team ensures the BK Precision 2120B delivers maximum performance for your application.