General Operation - TTI 1604 Manuel D'instructions

This section is a general introduction to the features and organisation of the multimeter intended
to be read before using the instrument for the first time. Detailed operation is covered in the
Making Measurements section.
Connections
Input Sockets
The input sockets are 4mm safety sockets on a 19mm pitch designed to accept 4mm safety plugs
with fixed or retractable shrouds. The sockets are all rated to 1000V (Category I)/600V (Category
II) with respect to earth ground.
The input impedance between V/Ω and COM is nominally 10MΩ. The black COM socket is
considered less positive than the red socket.
The mA/10A current sockets are low impedance; the voltage burden between mA/10A and COM
at full scale is <500mV. The black COM socket is considered less positive than the white mA/10A
sockets.
Multimeter Test Leads
The test leads supplied meet the requirements of IEC1010-2-031 and are rated to 1000V
Category III. Use only the test leads provided, or a set of similar performance, to ensure safe
operation. Alternative test leads should be rated to at least 1000V (Category I),
600V (Category II) and 10A current capability.
RS232
The RS232 interface permits remote control and data-logging to disk using optional Windows
software. The interface is fully opto-isolated from the measurement system; the host computer
provides power (via the DTR and RTS lines) to the TXD opto output and drives the RXD opto
input directly. The 9-way D-type on the meter must be connected to the 9-way D-type of the PC's
serial port via a 9-way cable (all connections made); the PC is nulled out at the multimeter
interface as shown below:
Pin
1
2
3
4
5
6
7
8
9
Signal grounds are connected to instrument safety ground.
To ensure compliance with EMC legislation use only screened cable assemblies with screened
connectors when connecting to other equipment.
10
Name Description
DCD Linked to DTR
TXD Transmitted data from instrument
RXD Received data to instrument
DTR DTR from host PC must be set to +9V (logic 0)
GND Signal ground
DSR Linked to DTR
RTS RTS from host PC must be set to -9V (logic 1)
CTS Linked to RTS
GND Signal ground

General Operation