# Keithley 2001 - 7.5 Digit Multimeter - Used ### Key Features at a Glance - True 7.5-digit resolution based on a 28-bit A/D converter - 1 nV resolution; 1 nV to 1100 V on DC voltage - Exceptional measurement integrity at high speed - Built-in peak detector captures spikes down to 1 µs - TRMS AC, average AC, peak AC, AC+DC, and crest factor measurement - 1 Hz to 15 MHz frequency counter; up to 2000 readings/s at 4.5 digits - DC in-circuit current measurement - Optional 10-channel scanner card for built-in multiplexing In summary, the Keithley 2001 is a 7.5-digit high-performance digital multimeter built around a 28-bit A/D converter. It delivers performance specifications usually associated with instruments costing several thousand dollars more, and offers a broad range of built-in measurements: TRMS AC, DC in-circuit current, peak spikes, temperature with thermocouples or RTDs, and frequency to 15 MHz. ## What is the Keithley 2001 used for? The 2001 is used wherever exceptional resolution and accuracy are required alongside the throughput needed for production test or scan-and-measure applications. With the optional plug-in scanner card it becomes a complete 10-channel measurement system for production test, design verification, and metrology where high accuracy is critical. ### How does true 7.5-digit resolution work? Many DMMs claim 7.5-digit resolution but reach it only by averaging multiple readings. The 2001's resolution comes from its 28-bit A/D converter directly, providing the dynamic range to measure from 1 µV to 20 V on a single range without range-shift errors or delays. ### Factual grounding — DC voltage performance Specification Value 200 mV range, 1-year accuracy ±(37 ppm rdg + 6 ppm rng) 2 V range, 1-year accuracy ±(25 ppm rdg + 2 ppm rng) 20 V range, 1-year accuracy ±(24 ppm rdg + 4 ppm rng) 200 V range, 1-year accuracy ±(38 ppm rdg + 3 ppm rng) 1000 V range, 1-year accuracy ±(41 ppm rdg + 6 ppm rng) Input resistance (200 mV to 20 V) \>10 GΩ ### Entity authority The Keithley 2001 is a metrology-grade DMM that sits alongside HP/Agilent 3458A-class instruments at a significantly lower acquisition cost. Patented AC measurement circuitry delivers AC accuracy that is several times better than typical DMMs at low signal levels — guaranteed down to 1% of selected range versus 5 to 10% for most other instruments. ### Applications - Production test, design verification, and metrology - Standard cell comparisons and transfer measurements (DCV transfer) - Low-frequency AC measurement — vibration, servo, guidance, control systems - Peak-spike capture on power supplies, transients, and short dropouts - Temperature measurement with thermocouple or RTD inputs ## Accessories Supplied Standard accessory packages ship where applicable. Unnecessary accessories may not be included on this Pre-Owned unit; contact a Test Architect to confirm anything specific your application requires. ## Product Core and Specifications The 2001 wraps its 28-bit A/D in an extensive measurement function set: DCV, ACV, DCI, ACI, 2- and 4-wire resistance to 1 GΩ, frequency to 15 MHz with adjustable trigger level, temperature, peak-spike capture, and DC in-circuit current. A built-in bar-graph display indicates data as a percentage of range from ±0.01% to ±100%, replacing a separate nulling differential voltmeter for trend monitoring. ### AC voltage performance Specification Value 200 mV / 2 V range, 0.1 to 2 kHz ±(0.03% rdg + 0.015% rng) 20 V / 200 V range, 2 to 10 kHz ±(0.06% rdg + 0.015% rng) Bandwidth (typical) 1 Hz to 2 MHz Crest factor measurement range 20 Hz to 1 MHz ### Resistance, current, and frequency Specification Value 4-wire ohms range 20 Ω to 1 GΩ (2-wire) 20 Ω 4W range, 1-year accuracy ±(72 ppm rdg + 7 ppm rng) DC current range 200 µA to 2 A AC current bandwidth (typical) 20 Hz to 100 kHz Frequency counter input 1 Hz to 15 MHz, ±0.03% rdg Peak-spike detection Single-event down to 2 µs; repetitive 500 ns ### General Specification Value Power 90 to 134 V and 180 to 250 V universal self-selecting; 50/60/400 Hz self-identifying Consumption <55 VA Operating temperature 0 to 50 °C Humidity 80% RH to 35 °C Dimensions 90 mm H × 214 mm W × 369 mm D Weight <4.2 kg (<9.2 lb) EMC Conforms to VDE 0871B, IEC 801-2; FCC Part 15 Class B Safety Conforms to IEC 348, CAN/CSA-C22.2 No. 231, MIL-T-28800E ### Scanner Card Option The 2001 accepts an optional 10-channel scanner card (2000-SCAN), a 10-channel scanner card with two high-speed channels (2001-SCAN), or a 9-channel thermocouple scanner card (2001-TCSCAN). The scanner cards turn the 2001 into a self-contained scan-and-measure system without a separate external scanner. ### About This Pre-Owned Unit - Warranty included. - Functional verification included. - Calibration available as an optional add-on service. - Unnecessary accessories may not be included; contact a Test Architect to confirm anything specific. This webpage was written by a human with an A.I. "Intern", which may contain errors. 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 - **Vendor:** Keithley - **Type:** Multi Met - **Tags:** Keithley, Manufacturers, Meters & DAQ, Multimeter, product_manual_group_1, Product_used, Updated Item Review ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 0.00 USD | In stock | | NIST Traceable with Full Data | 0.00 USD | In stock | | ISO IEC 17025 Accredited | 0.00 USD | In stock | ## Images - Keithley 2001 - 7.5 Digit Multimeter - Used --- > Source: [ValueTronics](https://valuetronics.com/products/2001-keithley-multimeter-used) > Updated: 2026-05-26