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.
