# B+K Precision 1785A 18V/5A Programmable DC Power Supply (Pre-Owned) # B+K Precision 1785A 18V/5A Programmable DC Power Supply (Pre-Owned) ## Key Features At A Glance - Programmable DC output up to 18V/5A (1785A), 30V/3A (1786A), or 60V/1.5A (1787A) - Nine user-programmable preset outputs for fast recall of frequently used voltage and current settings - Ten-step user-programmable output routine for automated test sequences in R&D or production - In-case calibration via integral system software for uninterrupted operation - Metering accuracy of ±(0.5% + 1 digit) with 1mV ripple and noise (RMS) - Line and load regulation of 0.02% + 5mV - Optional RS-232 interface with included serial cable and Windows/DOS software - LED voltmeter and ammeter display with direct keypad entry The BK Precision 1785A is a programmable DC power supply offering 0–18V output with current capability of 0–5A. It is part of a three-model family — the 1785A, 1786A, and 1787A — that shares a common control architecture and feature set while offering different voltage and current envelopes to match the application. Direct keypad entry allows voltage and current values to be selected quickly and accurately, and the unit displays measured output on integrated LED voltmeter and ammeter readouts. BK Precision identifies these supplies for use in electronics work, manufacturing, design labs, electronic education, and battery charging. The combination of programmability, preset memory, and in-case calibration makes them suited to environments that need repeatable voltage and current settings across multiple test cycles, whether on a single bench or as part of an automated test routine. ## Compare Other Models in This Series The 1785A, 1786A, and 1787A make up a three-model family of programmable DC power supplies from BK Precision, sharing the same control interface, display, programming features, and chassis. The differentiation between them is the output envelope — each model targets a different voltage and current range while preserving the same programmability, preset memory, and 10-step routine capability across the line. All three models carry the same metering accuracy of ±(0.5% + 1 digit), the same 1mV RMS ripple and noise specification, and the same 0.02% + 5mV line and load regulation. The choice between them comes down to whether the application calls for higher current at lower voltage, balanced voltage and current, or higher voltage at lower current. Each pre-owned model below is listed on its own dedicated product page with condition-matched pricing and availability. Click through to the specific model that fits your output requirement to see the full listing details and quote options for that exact unit. The 1785A sits at the higher-current end of this family, with 0–18V output and 0–5A current capability. This makes it the natural fit when the device under test runs at lower voltage but draws more current — typical of logic-level circuits, low-voltage analog work, and battery charging applications within the supply's voltage range. The 1785A delivers up to 5A at 18V — the highest current in the family — and is suited to lower-voltage, higher-current loads. The 1786A doubles the voltage range to 30V while dropping current capability to 3A, giving a balanced envelope for general bench work. The 1787A extends voltage further to 60V but reduces current to 1.5A, making it the choice when the application needs the higher voltage and current demands are modest. The comparison table that follows lists the headline output specifications side by side. Programmability features, accuracy, ripple, regulation, and the physical chassis are identical across the three models — only the voltage and current envelope changes. Model Output Voltage Output Current Interface **1785A** 0 - 18V 0 - 5A RS-232 (Option) 1786A 0 - 30V 0 - 3A RS-232 (Option) 1787A 0 - 60V 0 - 1.5A RS-232 (Option) 1770 0-17.5V; 0-35V 0-6A; 0-3A GPIB Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - User Manual - Serial Cable - Windows Software - DOS Software ## Product Core & Specifications Specification 1785A Output (DC) 0 - 18V Output Current (Amp.) 0 - 5A Metering Accuracy ±(0.5% + 1 digits) Ripple & Noise (RMS) 1mV Line Regulation 0.02% + 5mV Load Regulation 0.02% + 5mV RS-232 Option Operating Voltage 120V, 60Hz (or on request 220 - 240V) Dimension (WxHxD) 8.07 x 4.53 x 10.63 in. (205 x 115 x 270 mm) Accessory Supplied User Manuals, Software Weight Approximately 11 lbs. (5 kg) Display LED Voltmeter & Ampmeter **Important:** Standard line input is 120V, 60Hz. 220–240V operation is available on request — confirm input voltage configuration matches your facility before connecting.**Important:** For the 1785A/1786A/1787A series, the RS-232 interface is an option (not included with the base unit).**Important:** Operating voltage for the 1785A/1786A/1787A is 120V, 60Hz standard; 220 - 240V is available on request. ## 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:** 175.0 USD - 328.0 USD - **Vendor:** B+K Precision - **Type:** Dc Supply - **Tags:** BK Precision, DC Power Supply, Manufacturers, Power Supplies & Loads, product_manual_group_1, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 175.00 USD | In stock | | NIST Traceable | 268.50 USD | In stock | | NIST Traceable with Full Data | 285.50 USD | In stock | | ISO IEC 17025 Accredited | 328.00 USD | In stock | ## Images - B+K Precision 1785A 18V/5A Programmable DC Power Supply (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/1785a-b-k-precision-dc-power-supply-used) > Updated: 2026-05-30