Source-Measure Terminals - Keithley 6430 Instruction Manual

3. At the rear panel of the mainframe, remove the plastic safety cover from the preamp
connector. This connector is labeled "REMOTE PreAmp." The plastic cover is secured
to the connector with two screws. Hold on to the plastic cover and the retaining screws.
Whenever the Remote PreAmp is not being used, the plastic safety cover must be re-
installed on the mainframe preamp connector.
4. Connect the other end of the preamp cable to the mainframe.

Source-measure terminals

The SourceMeter can be used with or without the Remote PreAmp. However, when not
using the Remote PreAmp, the lower current ranges and higher resistance ranges are not avail-
able. The small Remote PreAmp can be positioned near the DUT allowing the use of short triax
cables. Short triax cables help minimize cable capacitance which could adversely affect the
response time of low current measurements.
When not using the Remote PreAmp, all connections to the SourceMeter are made at the
rear panel of the mainframe using cables terminated with banana plugs. These terminals are
summarized in Section 1 (Figure 1-2). When using the Remote PreAmp, not all source-mea-
sure terminals are available at the preamp and must be accessed at the mainframe. Table 2-1
lists each mainframe terminal and the equivalent Remote PreAmp terminal.
Table 2-1
Terminal equivalency between mainframe and Remote PreAmp
Mainframe terminal
INPUT/OUTPUT HI
INPUT/OUTPUT LO
4-WIRE SENSE HI
4-WIRE SENSE LO
V, Ω GUARD
GUARD SENSE
Chassis ground (screw)
N/A = Not available at Remote PreAmp.
NOTE
Whenever the Remote PreAmp is connected to the mainframe, adhere to the follow-
ing rules to achieve best performance:
• Do not use INPUT/OUTPUT HI and 4-WIRE SENSE HI on the mainframe.
Access these terminals at the Remote PreAmp.
• Access input/output low at the Remote PreAmp or at the mainframe, but not both.
Test circuit common should be tied to one point to avoid ground loops which
could generate error currents.
• Do not use guard from the mainframe and the Remote PreAmp at the same time.
Use one or the other.
Equivalent Remote PreAmp terminal
IN/OUT HI
IN/OUT LO
SENSE HI
N/A
GUARD (cable guard only)
N/A
N/A
Connections 2-3