Keithley 3700 series Reference Manual page 228

Section 9: Instrument Control Library (ICL)
dmm.connect
Attribute
Usage
Remarks
Details
Example
dmm.dbreference
Attribute
Usage
9-84
Indicates how the DMM relays should be connected to the analog backplane.
To read the DMM relay connection setting:
value = dmm.connect
value: Represents the present DMM relay connection setting
To write the DMM relay connection setting:
dmm.connect = value
value: Represents the desired DMM relay connection setting
where value is:

dmm.CONNECT_NONE or 0 to have no relays connected

dmm.CONNECT_ALL or 7 to have all relays connected (default value)

dmm.CONNECT_TWO_WIRE or 1 to have two-wire relay connected

dmm.CONNECT_FOUR_WIRE or 3 to have two-wire & sense relays connected

dmm.CONNECT_TWO_WIRE_AMPS or 5 to two-wire & amps relay connected

dmm.CONNECT_AMPS or 4 to have amps relay connected
Use the value setting, as indicated in the usage section to indicate, which of the DMM
relays you want connected to the backplane. The relays are bitmapped into the lower 3
bits of the value where bit 0, a value of 1, represents the 2-wire relay. Bit 1, a value of
2, represents the sense relay and bit 3, a value of 4, represents the amp relay. By
setting the appropriate bit to a 1, then that relay is closed. Likewise, setting it to zero,
opens that relay.
An error will be generated only if the sense relay bit is set to a 1 and if the sense relay
with amps is selected. These two settings correspond to a value of 2 or 6, respectively.
Also, an error will be generated for a value less than 0 or greater than 7.
Default setting is dmm.CONNECT_ ALL.
Use of this command is not recommended with the exception of special cases. The
default setting should handle most applications.
To connect the DMM two-wire and amp relays to the analog backplane:
dmm.connect = dmm.CONNECT_TWO_WIRE_AMPS
Indicates the DB reference setting for the DMM in volts.
To read the DB reference:
value = dmm.dbreference
value: Represents the present DB reference setting in volts
To write the DB reference:
dmm.dbreference = value
value: Represents the desired DB reference in volts (1e-7 to 1000)
Series 3700 System Switch/Multimeter Reference Manual
Document Number: 3700S-901-01 Rev. A / August 2007