Lake Shore Model 370 AC Resistance Bridge User’s Manual
4.4.2 Display
Resolution
Each display location can be assigned a resolution from 4 to 6 digits. The resolution selection only affects the display;
readings sent over computer interface are always 6 digits. It is not necessary to change display resolution from the
default of 6 digits because that selection gives the maximum resolution available on the instrument. If a resolution of less
than 6 is chosen, additional digits are truncated to make measurement noise less distracting.
To change display resolution, continue from the display source screen or press
Display Setup
then
Enter
until the
following display setup screen appears as a prompt for display resolution on the chosen display location.
Display Setup
Display Location 1
Select With °®
Display Resolution: 6
Use the
s
or
t
key to select a resolution from 4 to 6. Press
Enter
to accept the new selection and continue to other
display features. Press
Escape
to cancel the new selection and return to the normal display.
4.4.3 Display
Brightness
The vacuum fluorescent (VF) display on the Model 370 has four brightness settings between 100% and 25% that can be
changed from the front panel. The brightness setting changes the entire VF display but does not affect the LED
annunciators to the right of the display. Continuous use of the instrument at 100% brightness will reduce the operating
life of the display.
None of the brightness settings will turn the display off completely. The instrument will operate with the display
unplugged for applications that require absolute darkness but
both
the digital control and power supply cables must be
unplugged with the instrument power turned off or damage to the display will result.
To change display brightness, continue from the display resolution screen or press
Display Setup
then
Enter
until the
following display setup screen appears as a prompt for display brightness.
Display Setup
Select With °®
Brightness: 75 %
Use the
s
or
t
key to select brightness from 25% to 100%. Press
Enter
to accept the new selection and return to the
normal display. Press
Escape
to cancel the new selection and return to the normal display.
4.5
EXCITATION MODES, RESISTANCE RANGE, AND AUTORANGE
The Model 370 uses current source excitation to measure resistance and it can be operated in this mode. The instrument
firmware is also able to simulate voltage excitation of the measured resistor to create a second operating mode.
Resistance range selection and autorange behave differently when a different excitation mode is selected. These
parameter selections can be different for every scanner channel if a scanner is installed. The instrument remembers how
each channel is configured and will return to that configuration whenever the channel is chosen. Refer to Paragraph 4.8.4
for instructions on how to change parameter selections for all channels at the same time.
4-6
Operation
