Keithley 7058 Low Current Scanner Card

The Keithley 7058 Low Current Scanner Card is a 10-channel switching module engineered for precision measurement of sensitive signal levels. It delivers sub-picoampere offset current performance (< 1 pA, typically 10¹⁵ Ω) to preserve signal integrity in low-level current applications. The card features guarded switching architecture, triaxial input connectors for direct electrometer interfacing, and removable jumpers for flexible voltage-switch configuration. Designed as a plug-in card for Keithley 7001 and 7002 Switch Mainframes, it handles signals up to 200 V, 100 mA (resistive load) with contact life exceeding 10,000,000 cold-switching closures.

Technical Specifications

Channels: 10 per card

Maximum Signal Level: 200 V, 100 mA (resistive load only)

Offset Current: < 1 pA (< 10⁻¹² A); typically < 10⁻¹³ A

Contact Potential: 10¹⁵ Ω, 10¹⁰ Ω, < 50 pF

Common Mode Voltage: < 100 V peak

Actuation Time: < 15 ms (exclusive of mainframe)

Contact Resistance: 10,000,000 closures (cold switching); > 1,000,000 closures (maximum signal levels)

Key Features

Sub-picoampere offset current eliminates signal corruption in ultra-low-level measurements

Guarded switching maintains isolation exceeding 10¹⁵ Ω between channels

Triaxial input connectors enable direct connection to Keithley electrometers

Removable jumpers permit reconfiguration of channels as voltage switches

Single-pole, break-before-make relay architecture for signal HI; common Signal LO across all 10 channels

Fast actuation at < 15 ms supports high-speed test sequences

Typical Applications

Picoammeter and electrometer multiplexing

Low-leakage current measurement and switching

High-impedance circuit testing

Multi-point capacitive and resistive characterization

Compatibility & Integration The 7058 integrates into Keithley 7001 and 7002 Switch Mainframes as a standard plug-in card, enabling rapid expansion of switching capacity in existing test systems.