Keithley 7700 – 20-channel, Differential Multiplexer Module with automatic CJC and Screw Terminals
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A built-in automatic cold junction compensation network dictates the operational framework of this hardware. The Keithley 7700 instrumentation card features a 20-channel, differential multiplexer module with automatic CJC and screw terminals. This 300V data logging asset uses high-accuracy isothermal copper blocks to guarantee tight thermocouple measurement parameters.
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Keithley 7700 - 20-channel, Differential Multiplexer Module with automatic CJC and Screw Terminals Specs
| CHANNELS 1-20: | Multiplex one of 20 2-pole or one of 10 4-pole signals into DMM. |
| CHANNELS 21-22: | Multiplex one of 2 2-pole current signals into DMM |
| Channels (1-20): | 300V DC or 300V rms (425V peak) for AC waveforms, 1A switched, 60W, 125VA maximum. |
| Channels (21-22): | 60V DC or 30V rms, 3A switched, 60W, 125VA maximum. |
| CONTACT LIFE (typ.): | >10 5 operations at max. signal level. >10 8 operations no load 1 |
| CONTACT RESISTANCE: | <1Ω at end of contact life. |
| CONTACT POTENTIAL: | <±500nV typical per contact, 1µV max. <±500nV typical per contact pair, 1µV max. |
| OFFSET CURRENT: | <100pA. |
| CONNECTOR TYPE: | Screw terminal, #20 AWG wire size. |
| ISOLATION BETwEEN ANY TwO TERMINALS: | >1010 Ω, <100pF |
| ISOLATION BETwEEN ANY TERMINAL AND EARTH: | >109 Ω <200pF. |
| CONNECTOR TYPE: | <100pA <200pF. |
| OFFSET CURRENT: | <100pA. |
| CONNECTOR TYPE: | Screw terminal, #20 AWG wire size |
| ISOLATION BETWEEN ANY TWO TERMINALS: | >1010 Ω, <100pF |
| ISOLATION BETwEEN ANY TERMINAL AND EARTH: | >109 Ω, <200pF |
| INSERTION LOSS (50Ω Source, 50Ω Load): | w/ Internal DMM |
| <0.1 dB: | 1 MHz |
| <3 dB: | 2 MHz |
| CROSSTALk (50Ω Load): | w/ Internal DMM |
| 10 MHz: | <–40 dB |
| 25 MHz: | ** |
| COMMON MODE VOLTAGE: | 300V or 300V rms (425V peak) for AC waveforms between any terminal and chassis. |
| TEMPERATURE ACCURACY USINg INTERNAL CJC: | 1.0°C (see mainframe specification for details). * Channels 24 and 25 are open. Refer to ROUTE:MULTiple command in 27xx User Manual. ** Not valid. |
| 20 CHANNELS: | 20 channels of 2-pole relay input. All channels configur able to 4-pole |
| 2 CHANNELS: | 2 channels of current only input. |
| RELAY TYPE: | Latching electromechanical. |
| ACTUATION TIME: | <3ms |
| FIRMWARE: | Specified for Model 2700 rev. A01, 2701 rev. A01, and 2750 rev. A01 or higher. |
| OPERATING ENVIRONMENT: | Specified for 0°C to 50°C Specified to 80% R.H. at 35°C |
| STORAGE ENVIRONMENT: | –25°C to 65°C. |
| WEIGHT: | 0.45kg (1 lb) |
| ACCESSORY AVAILABLE: | Model 7401 Type K Thermocouple Wire, 30.5m (100 ft) |
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