Instructions

6
Connections
Component Connections
The leads of the Device Under Test (DUT) are inserted in the Kelvin connectors on the top of the
instrument. Axial components can be inserted into the adaptors supplied, which themselves are
inserted into the Kelvin connectors. Both forms of connection provide true four–terminal contact
to the DUT to ensure accurate measurement of low impedance components.
The leads of radial components can be pushed directly into the spring–loaded connectors.
Alternatively, for delicate leads, the connectors can be opened by pressing down on the
connector actuators.
Similarly, the axial adaptors can be inserted by pushing directly into the main connectors; adjust
the position of the adaptors to suit the lead and body length of the axial DUT.
Ensure the contact surfaces of the Kelvin connectors are free from contamination. If in doubt,
refer to the Maintenance section.
Surface Mount Components
Plug the interface module of the optional surface mount tweezers into the Kelvin connectors.
True four–terminal connection is maintained at the tweezers.
Remote Connections
A remote test jig can be connected via the BNC connectors on the optional interface module
which inserts into the Kelvin connectors on the top of the instrument. The connectors are labelled
High Drive, High Sense, Low Sense and Low Drive. The screens of the Drive coax cables should
be connected together at the remote end and connected to the screen and case of the external
jig. The screens of the Sense leads should be isolated both from each other and from the jig
screen.
Whilst leads of up to 1 metre are unlikely to present problems, the leads to an external jig should
be kept as short as possible and the accuracy of measurements checked at all test frequencies
and over the range of values being measured before being relied upon.
RS232
9–pin D–connector for PC remote control with the following connections:
Pin
Name
Description
1
DCD
Linked to pins 4 and 6
2
TXD
Transmitted data from instrument
3
RXD
Received data to instrument
4
DTR
Linked to pins 1 and 6
5
GND
Signal ground
6
DSR
Linked to pins 1 and 4
7
RTS
Linked to pin 8
8
CTS
Linked to pin 7
9
–
No internal connection
Connect to a PC with a cable which has pins 2, 3 and 5 wired plus pins 1, 4 & 6 and pins 7 & 8
linked at the PC end. Alternatively, since the links are made within the instrument, a fully–wired
1–to–1 cable may be used.