resistivity information on probe spacing or wafer thickness may be required
from the user which is discussed later in the manual. If the unit is switched
off then next time it is switched on it will be on the default setting of
toggling between mV and ohms/square.
When using FWD and REV the voltage is indicated as either positive or
negative on the screen. For ohms/square and ohm.cm values the display will
show either ‘F’ for forward current or ‘R’ for reverse current.
If the setting is ohm.cm for wafers a ‘W’ will also appear when displaying
ohm.cm values to indicate that this is the measurement mode
Starting or stopping current flow through the sample
Pressing the forward button will pass the selected current through the probe
head in a forward direction, and should yield a positive voltage reading.
Pressing the standby button when current is flowing in the forward or
reverse direction will put the unit in standby so that no current is flowing.
Pressing the standby button while the unit is already in standby will begin
the autorange feature which is discussed later in this manual.
Pressing the reverse button will pass the selected current through the probe
head in a reverse direction, and should yield a negative voltage reading of
equal or similar magnitude to the forward reading
High Resolution
The High button puts the unit in high resolution mode and is the most
desirable setting for high accuracy measurements. In high resolution
voltages from 0mV to 150mV can be measured.
Low Resolution
The Low button puts the unit in low resolution mode. Low resolution can be
used where less accuracy and higher speed are required, or where highly
insulating samples are being measured which yield a voltage higher than
150mV, but below 1.2V which is the unit’s measurement limit.
Storing Readings
Pressing the store button stores the displayed voltage value to on board non
volatile memory. If the display is showing an ohms/square or ohm.cm
reading the equivalent voltage reading is stored. The measurements stored
