Teledyne HPM-2002-OBE User Manual

Page 13 of 39 

The HPM-2002-OBE with analog output and display is shown in the figure below. The user interface 

consists of a status bar, a mode bar, and setpoint test jacks. 

 

 

The status bar gives information about the condition of the HPM-2002-OBE. High and Low indicate 

whether the set points are activated. Error indicates if there was a problem downloading the EEPROM. Torr 
and mTorr indicate what pressure regime the gauge is measuring. 

The mode bar indicates which mode has been selected. The HPM-2002-OBE has five modes which the 

user may enter. This is similar to the six modes which can be entered in the bench top/panel mounted HPM-
2002, there is no interlock feature; when the user changes the settings within a mode any adjustments that have 

been made will be permanent once the mode is exited. (To exit without making changes permanent, the user 
must turn the power off.) 

The HPM-2002-OBE provides TTL outputs for process control. These signals are available on the 15-pin 

connector (see previous table in Section 2.4). 

To view the High set point, place the HPM-2002-OBE in the High mode by pressing the SELECT button 

until the High mode light is illuminated. The display then shows the set point selected. During normal operation 

the alarm light will illuminate and the TTL output (pin # 1) will go high (+5V) if the pressure exceeds the set 
point. 

Similarly, to view the Low set point, place the HPM-2002-OBE in the Low mode by pressing the SELECT 

button until the Low mode light is illuminated. The display then shows the set point selected. During normal 

operation the alarm light will illuminate and the TTL output (pin # 2) will go high (+5V) if the pressure 
becomes less than the set point. 

To adjust a setpoint, place the HPM-2002-OBE in either setpoint mode (High or Low). Next, use the 

ADJUST rotary encoder until the desired setpoint is displayed. Finally, place the HPM-2002-OBE back in the 

Run mode. The new set points are now stored in the HPM-2002-OBE’s memory. 

The HPM-2002-OBE will automatically enter the Run mode upon start-up. This is the mode for normal 

operation and the mode in which the instrument will spend most of its time. In the Run mode the HPM-2002-