General Operation
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 later
sections, starting with Making Basic Measurements.
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 (Cat I)/600V (Cat II) with
respect to earth ground.
The input impedance between V/Ω and COM is nominally 10MΩ on dc ranges and 1MΩ on ac
ranges. 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 <250mV for the mA ranges and <500mV for the 10A range. 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 Cat 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 (Cat I), 600V (Cat II) and 10A current
capability.
RS232
The RS232 interface only operates when the instrument is run from an ac supply; RS232 signal
ground is then connected to the safety ground. The interface is fully isolated from the
measurement system.
9-pin D-connector compatible with the Thurlby Thandar ARC (Addressable RS232 Chain) system.
The pin connections are shows below:
Pin Name Description
1 - Power to optional PC-02
2 TXD Transmitted data from instrument
3 RXD Received data to instrument
4 - No internal connection
5 GND Signal ground
6 - No internal connection
7 RXD2 Secondary received data
8 TXD2 Secondary transmitted data
9 GND Signal ground
Pin 2, 3 and 5 may be used as a conventional RS232 interface with XON/XOFF handshaking.
Pins 7,8 and 9 are additionally used when the instrument is connected to the ARC interface.
Signal grounds are connected to safety ground.
To ensure compliance with EMC legislation use only screened cable assemblies with screened
connectors when connecting to other equipment.
GPIB (IEEE-488)
An IEEE-488 interface is available on the alternative mains-only version; IEEE-488 is not a
retrofittable option. The GPIB connector is located on the rear panel together with the switch
which selects between RS232 and GPIB.
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