Astro-Med ISM48S Overview Astro-Med, Inc. ISM48S Performance Characteristics: Form Factor: Module (proprietary interface/bus) Number of Channels: 4 ch Measurement Parameter: Frequency,Resistance,Voltage Minimum Voltage: 50 mV Maximum Voltage: 5 V Maximum Frequency: 500 Hz Input Impedance: 2 MOhm Astro-Med, Inc. ISM48S Measurements/Features: CMV: 1500 Vpeak I/p Cnnctr: 10kV Plug Assembly O/p Cnnctr: Guarded Banana Jck Pwr: 11-18Vdc to rechrg battry 1:1 divider