Model 7700 - Connections And Wiring - Keithley 7702 User Manual

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.
• If a system channel is already closed and you attempt to select the DCI or ACI function, the message
"INVALID FUNC" will be displayed briefly. For remote programming, error -221 (Settings conflict)
is generated.
Making amps measurements – In order to perform amps measurements, you must use the front panel inputs
of the 27xx mainframe. You can still use the 7703 module for other aspects of the test (such as controlling a
bias supply for DUT), but you must use multiple channel operation to close channels.
Screw terminal access (Model 7700 and 7702)
Turn the access screw to unlock and open the cover. Press in the access screw to lock.
Figure 1
Screw terminal access
Model 7700 – connections and wiring
The Model 7700 is a 20-channel differential multiplexer module with the following features:
• 2-wire or 4-wire Ω measurement (automatically pairs switches for four wire measurements — n + 10)
• Screw terminal connections
• Temperature applications (RTD, thermistor, thermocouple)
• Two protected channels for current measurements (external shunts not required)
• Built-in cold junction reference
• Latching type relays (relays hold their position after power is removed)
• Designed specifically for use with Keithley's Models 2700, 2701, and 2750 Systems.
2
LOCK
H L H L
CH21 CH22
CH7 CH8 CH9 CH10
H L H L H L H L
INPUT
(V,2 WIRE)
SENSE
(OHMS, 4 WIRE)
H L H L H L H L
CH17 CH18 CH19 CH20
H L H L H L
H L H L H L
CH11 CH12
CH13 CH14 CH15 CH16