www.keithley.com Model 7700, 7702, and 7703 Multiplexer Modules User’s Guide PA-695 Rev.
Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input power disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator. For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test.
7700 20-Channel Differential Multiplexer w/Automatic CJC GENERAL 20 CHANNELS: 20 channels of 2-pole relay input. All channels configurable to 4-pole. 2 CHANNELS: 2 channels of current only input. RELAY TYPE: Latching electromechanical. ACTUATION TIME: <3ms. CAPABILITIES 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.
7702 40-Channel Differential Multiplexer GENERAL 40 CHANNELS: 40 channels of 2-pole relay input. All channels configurable to 4-pole. 2 CHANNELS: 2 channels of current only input. RELAY TYPE: Latching electromechanical. ACTUATION TIME: <3ms. CAPABILITIES CHANNELS 1-40: Multiplex one of 40 2-pole or one of 20 4-pole signals into DMM. CHANNELS 41-42: Multiplex one of 2 2-pole current signals into DMM.
PURCHASED ITEM 7703 32-Channel High Speed Differential Multiplexer GENERAL 32 CHANNELS: 32 channels of 2-pole relay input. All channels configurable to 4-pole. RELAY TYPE: Reed. ACTUATION TIME: <1ms. HI Card Input LO HI Card Sense LO HI CAPABILITIES Channel 1 CHANNELS 1-32: Multiplex one of 32 2-pole or one of 16 4-pole signals into DMM. LO (Channels 2–15) INPUTS Channel 33 (see Note) HI Backplane isolation Input HI MAXIMUM SIGNAL LEVEL: Channels (1-32): 300V DC or rms, 0.5A switched, 10W maximum.
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Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 (440) 248-0400 Fax: (440) 248-6168 www.keithley.com Model 7700, 7702, and 7703 Multiplexer Modules User’s Guide Introduction t^okfkd Connection and wiring procedures contained in this User’s Guide are intended for use by qualified service personnel only. Do not perform these procedures unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death.
Amps measurements – The 7703 module does not support amps measurements. System channel operation cannot be used to close channels while an amps function (DCI or ICI) is selected. See the Model 27xx Manual for details. • If an amps function (DCI or ACI) is selected and you attempt to close a system channel, the message “NO AMPS CHAN” will be displayed briefly. For remote programming, error -222 (Parameter data out of range) is generated.
Connection information t^okfkd The information in this section is intended for qualified service personnel. Do not attempt to perform this procedure unless qualified to do so. Do not exceed the maximum specifications for the Model 7700. Connections to DMM functions are provided through the card backplane connector. • Current provided for through two protected channels (Channels 21 and 22). • INPUT connections. • SENSE (¾4 Wire) connections. • AMP and LO common connections to the DMM are also provided.
Wiring procedure t^okfkd The information in this section is intended for qualified service personnel. Do not attempt to perform this procedure unless qualified to do so. Use the following procedure to wire the Model 7700 module. Make all connections using correct wire size (up to 20 AWG). Also, make sure to add supplementary insulation around the harness for voltages above 42V peak (see Figure 3). t^okfkd All wiring must be rated for the maximum voltage in the system.
Table 1 Connection log Model 7700 Channel AMPS COM INPUT SENSE CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 AMPS21 AMPS22 Color Description H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L 5
Model 7702 – connections and wiring The Model 7702 is a 40-channel differential multiplexer module with the following features: • 2-wire or 4-wire ¾ measurement (automatically pairs switches for four wire measurements — n + 20) • Two protected channels for current measurements (external shunts not required) • Temperature applications (RTD, thermistor, thermocouple) • Latching type relays (relays hold their position after power is removed) • Screw terminal connections • Designed specifically for use with Kei
Figure 4 Model 7702 Screw terminal channel designations CH4 H L CH3 H L CH6 CH10 CH14 CH8 CH12 CH16 CH18 H L H L H L H L H L H L CH5 CH17 H L CH9 CH13 CH7 CH11 CH15 H L H L H L H L H L H L H L CH19 H L CH2 H L CH20 H L CH1 H L TE122 TE121 H L CH21 H L CH22 H L CH23 H L CH40 H L H L H L H L H L CH26 H L H L CH39 H L H L CH28 CH30 CH32 CH24 CH34 CH36 CH38 H L H L H L H L H L H L H L CH25 CH27 CH35 CH37 CH29 CH31 CH33 SENSE H L INPUT H L TE122 TE121 H L CH41 H L CH42 7
Figure 5 Wire dressing — Model 7702 Cable tie (2 places) T TE122 TE121 Supplementary Insulation Connection log Make a copy of Table 2 and affix it to the cover of the Model 7702. Use this to record connection information and channel descriptions as needed.
Table 2 Connection log Model 7702 Channel INPUT SENSE CH21 CH22 CH23 CH24 CH25 CH26 CH27 CH28 CH29 CH30 CH31 CH32 CH33 CH34 CH35 CH36 CH37 CH38 CH39 CH40 AMPS41 Color H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L Description Description Color Channel H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 AMPS42 9
Model 7703 – connections and wiring The Model 7703 is a 32-channel high speed differential multiplexer module with the following features: • 2-wire or 4-wire ¾ measurement (automatically pairs switches for four wire measurements — n + 16) • 50-pin D-Shell connectors (2 × DB50) • Temperature applications (RTD or thermistor) • High-speed non-latching reed relays (relays go to open state after power is removed or *RST) • Designed specifically for use with Keithley’s Models 2700, 2701, and 2750 Systems.
`^rqflk If both connectors (P1017 and P1016) are not used, install the extra Model 7788 50-pin D-shell as a plug on the open connector (see Figure 7). If the connector is left open, an electrical shock hazard may be present.
Connection log Make a copy of Table 4 and affix it to the cover of the Model 7703. Use this to record connection information and channel descriptions as needed.
Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies. A G R E A T E R M E A S U R E O F C O N F I D E N C E Keithley Instruments, Inc. Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY (534-8453) • www.keithley.
