Radio Frequency Labs 5950A Crystal Impedance Meter

Radio Frequency Labs 5950A Crystal Impedance Meter
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RFL 5950A
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Specifications
The 5950A Crystal Impedance Meter is designed to measure the effective resistance of piezoelectric crystals at both resonance and at anti-resonance, as indicated by zero phase shift.  When equipped with the 254A RF Module, the 5950A covers from 2.5 kHz to 4.5 MHz. Crystal resistance ranges of 200Ω, 2, 20, and 400 kΩ are selectable via a front-panel control. Maximum power level of 10 mW from 1.5 MHz to 4.0 MHz (15 to 200Ω range).
 
RFL 5950A Specs
254A Module:

2.5 kHz to 4.5 MHz
Plug-in load capacitors
Selectable substitution resistor
 

460A Module:

4.0 MHz to 60.0 MHz
Plug-in load capacitors
Selectable substitution resistor