7702.

The 7702 from Keithley is a 40-channel differential multiplexer module with screw terminals. This plug-in module offers 40 channels of 2-pole or 20 channels of 4-pole multiplexer switching that can be configured as two independent banks of multiplexers. The model 7702 provides two additional protected channels for current measurements. It is ideal for RTD, thermistor and thermocouple temperature applications. It has <gt/>10^10 ohm (<lt/>100pF) isolation between any two terminals, <gt/>10^9ohm (<lt/>200pF) isolation between any terminal and earth, <lt/>-40dB cross talk (10MHz, 50W load) and : <lt/>0.1dB below 1MHz/<lt/>3dB below 2MHz insertion loss (50W source, 50W load). The common mode voltage is 300V between any terminal and chassis. The maximum signal level is channels (1-40): 300VDC or RMS, 1A switched, 60W, 125VA maximum and channels (41-42): 60VDC or 30Vrms, 3A switched, 60W, 125VA maximum.

• 40 channels for general purpose measurements, plus 2 channels to measure current
• Two- or four-wire measurement
• Oversize screw terminal connection blocks are standard for easier connection
• 300V, 1A capacity for voltage channels (60W, 125VA)
• 3A capacity for current channels
• Relay closures stored in onboard memory
• Latching electromechanical relays, actuation time is less than 3ms
• Suitable for use with 2700, 2701, 2750 and 2790 mainframes
• Offset current is less than 100pA, connector type is screw terminal, #20AWG wire size
• Operating temperature range from 0°C to 50°C and weight is 0.5Kg