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BKPrecision 2120C
BKPrecision 2120C BK2120C


B&K Precision’s model 2120C is a dual trace oscilloscope that offers high performance at a low price.

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This product has been discontinued but there is quantity 1 still available - please email

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BKPrecision 2120C is a dual trace oscilloscope that offers high performance at a low price. Most competitor’s entry level oscilloscopes have a 20 MHz bandwidth, while this model is 30MHz.

The BK2120C is built by and backed by B&K Precision, a company that has been selling reliable, durable, value priced test instruments for over 60 years.

Features of the BKPrecision 2120C

  • Dual or single trace operation
  • 5 mV/div sensitivity
  • AUTO/NORM triggered sweep operation with AC, TVH, TVV and line coupling
  • Compact low profile design
  • cUL certified

Specifications of the BKPrecision 2120C

(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: CH 1, single trace
CH 2 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 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 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


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
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%)


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)

One Year Warranty

Supplied Accessories: Instruction manual, two PR-33A X1/X10 probes or equivalent, AC power cord and spare fuse

Optional Accessories:PR-32A demodulator probe, PR-37A x1/x10/REF. probe, PR-100A x100 probe, PR-55 high voltage x1000 probe,
LC-210A carrying case

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