Rev. 2 27
Operation
Using the Model 1700 Menus
2. The instrument has a built-in
sensor oscillator which will be
used if the level sensor is
connected to the BNC connector
on the rear panel of the
instrument with a maximum of
6 foot of RG59/U coaxial cable
(refer to Figure 1-1 on page 2).
Ensure the “NITROGEN
OSCILLATOR:” field displays
“INTERNAL”.
3. If the sensor is greater than 15 feet from the instrument, an
external oscillator/transmitter will have to be used and the
“NITROGEN OSCILLATOR:” will display “EXTERNAL” (refer to
Figure 1-2 on page 3).
4. Ensure that N2 LEVEL ON
HOME SCREEN? is set to YES.
5. Press the Home icon at the
bottom of the screen.
3.4.2 Other Liquid Helium Functions
3.4.3 Other Liquid Helium Functions
3.5 Alarms and Relays
3.5.1 Overview
The Model 1700 Instrument has two types of alarms, level-based and time-
based alarms.
3.5.1.1 Level-Based Alarms
The Model 1700 Instrument has two user-configurable level alarms. Each
alarm can be triggered by either level measurement (for dual level config-
ured instruments). Each alarm can be configured to be active above or
below a user-defined setpoint.
Figure 3-9. INTERNAL Oscillator
Indicated
Figure 3-10. Nitrogen Level Displayed
on Home Screen
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