# B&K Precision 9129B Triple Output Programmable DC Power Supply # B&K Precision 9129B Triple Output Programmable DC Power Supply ## Key Features At A Glance - Three independent, electrically isolated outputs: 0–30V/3A (CH1 & CH2) and 0–5V/3A (CH3), 195W total - Low-noise linear regulation: ≤5 mVp-p / ≤1 mVrms voltage ripple, ≤6 mArms current noise - Series and parallel combined modes increase available output voltage or current from CH1 and CH2 - Tracking mode maintains a user-configurable ratio between channels for coordinated multi-rail adjustment - Programming and readback resolution of 10 mV / 1 mA; programming accuracy ≤0.06% + 20 mV (voltage) - USB remote control via included USB-to-TTL serial adapter, supporting SCPI commands - Overvoltage (OVP) and overtemperature (OTP) protection plus front-panel keylock - Store and recall up to 27 instrument settings across 3 memory groups of 9 locations each The BK Precision 9129B is a triple-output linear programmable DC power supply with three independent, electrically isolated outputs. CH1 and CH2 each deliver 0–30V at up to 3A, while CH3 provides 0–5V at up to 3A, for a combined output capability of 195 watts. A vacuum fluorescent display shows voltage and current settings for all three channels simultaneously, and a numeric keypad and rotary knob with cursor keys allow direct entry or fine adjustment of set values. The 9129B is positioned by the manufacturer for education, service, and electronic design applications. The combination of three isolated outputs and series, parallel, and tracking combined modes lets a single instrument serve workflows that would otherwise require multiple supplies: powering positive and negative rails for bipolar analog circuits, combining channels to reach higher voltage or current, or maintaining a fixed ratio between rails during coordinated adjustment. ValueTronics stocks, tests, and ships the 9129B from our 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois. We operate as a buying-and-selling test equipment specialist rather than a drop-shipper, which means every unit that leaves our facility has been physically handled and verified against the manufacturer's published specifications by our in-house technical team. ## Accessories Supplied - Power cord - IT-E132B (USB to TTL serial adapter plus USB cable) - Test report - Certificate of calibration ## Product Core & Specifications Specification 9129B Output Rating Voltage 0–30 V (CH1 & CH2), 0-5 V (CH3) Current 0-3 A (all channels) Power 195 W Load Regulation Voltage ≤ 0.02 % + 4 mV Current ≤ 0.2 % + 3 mA Line Regulation Voltage ≤ 0.02 % + 4 mV Current ≤ 0.2 % + 3 mA Ripple & Noise Voltage ≤ 5 mVp-p / ≤ 1 mVrms Current ≤ 6 mArms Programming Resolution Voltage 10 mV Current 1 mA Readback Resolution Voltage 10 mV Current 1 mA Programming Accuracy ± (% output + offset) Voltage ≤ 0.06 % + 20 mV Current ≤ 0.2 % + 10 mA Readback Accuracy ± (% output + offset) Voltage ≤ 0.06 % + 20 mV Current ≤ 0.2 % + 10 mA Series Accuracy (combined mode) Voltage ≤ 0.5 % + 30 mV Current ≤ 0.2 % + 15 mA Parallel Accuracy (combined mode) Voltage ≤ 0.2 % + 30 mV Current ≤ 0.2 % + 25 mA General Memory 3 memory groups with 9 locations in each group Remote Interface USB (Virtual COM via included USB to TTL serial adapter) AC Input 110/220 VAC (+/- 10 %), 47 Hz - 63 Hz Operating Temperature 32 °F to 104 °F (0 °C to 40 °C), relative humidity up to 80% Storage Temperature \-4 °F to 158 °F (-20 °C to 70 °C) Dimensions (W x H x D) 8.45" x 3.47" x 13.96" (214.5 x 88.2 x 354.6 mm) Weight 16.05 lbs. (7.3 kg) Warranty Three-Year Warranty Standard Accessories Power cord, IT-E132B (USB to TTL serial adapter plus USB cable), test report, and certificate of calibration Optional Accessories IT-E151 rack mount kit **Important:** Maximum input rating: 110/220 VAC (±10%), 47–63 Hz, 700 VA. Confirm the rear-panel line voltage selector position matches the local mains before powering the unit on.**Important:** All specifications apply to the unit after a temperature stabilization time of 15 minutes over an ambient temperature range of 23 °C ± 5 °C. **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:** 899.0 USD - **Vendor:** B&K Precision - **Type:** Dc Supply - **Tags:** BK Precision, DC Power Supply, Manufacturers, Power Supplies & Loads, product_manual_group_1, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 899.00 USD | In stock | ## Images - B&K Precision 9129B Triple Output Programmable DC Power Supply --- > Source: [ValueTronics](https://valuetronics.com/products/9129b-b-k-precision-dc-power-supply-new) > Updated: 2026-05-30