The interface is fully isolated from the measurement system and the GPIB signal grounds are
connected to the safety ground. The pin connections are as specified in IEEE std. 488.1-1987.
The implemented subsets are:
SH1, AH1, T8, L4, SR0, RL2, PP0, DC1, DT0 C0, E2
The address is selectable from the front panel.
Switching On
Power Switch
The multimeter is switched on and off with alternate presses of the Operate key; this key only
switches the DC power to the measurement circuits. It does not switch the AC power, when this is
connected, which means that the isolated RS232 and GPIB circuits continue to be powered and
rechargeable cells (if fitted) continue to be charged. When the instrument is not in use, and if
battery recharging is not required, disconnect from the AC supply.
If the AC supply is removed whilst the meter is switched on one of two things will happen. If the
meter had been switched on (with the Operate key) after connection to AC power the meter will
automatically power off; if continued operation (from batteries) is required it will be necessary to
switch the instrument back on again. In this way the accidental exhaustion of batteries is avoided
when AC power is switched off, e.g. when a whole bench of equipment is switched off from a
master switch.
However, if the meter had been switched on and run from batteries before the AC power was
connected it will continue to run when the AC power is later removed. In this mode the batteries
provide back-up in the event of an AC power failure, useful if the meter is “baby-sitting” making,
for example, Min-Max measurements over a long time period.
When the instrument is switched on with the Operate key the display first shows all the display
segments whilst running an auto-zero routine before setting the operating conditions as described
below.
Power-up Settings
At power-up the default action is to restore power-down settings, including any modifiers selected
at the time that the meter was turned off.
To restore factory default settings (see Default Settings section), hold the Cancel key depressed
whilst the meter is turned on with the Operate key; the buzzer will sound to signify that the
defaults have been restored.
To review the revision of the installed software hold the Shift key depressed whilst the meter is
turned on with the Operate key; the revision will be shown as r x.x until the Shift key is released.
To show all the display segments together (i.e. perform a display test) hold any other key
depressed whilst the meter is turned on with the Operate key; the display will continue to show all
segments until another key is pressed.
Buzzer
A short beep is sounded whenever a valid key is pressed. Longer beeps are reserved to indicate
illegal key presses, e.g. selecting Hz in the secondary display when the primary display has been
set to Vdc; such keystrokes are not accepted.
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