Scientific Notation
The Model 2002 measures pressure that spans more than seven decades. In order to easily display these readings, Hastings Instruments has employed scientific notation. In scientific notation, the mantissa (the fixed point part) is multiplied by some power of 10 (given by the exponent).
| Powers of 10 | ||
103 | = 1000 | = 0.1 | |
102 | = 100 | = 0.01 | |
101 | = 10 | = 0.001 | |
100 | = 1 | = 0.0001 |
As an example: 7.60 x 10+2 Torr
{
Mantissa exponent
"7.60 multiplied by 100" = 760 Torr which is one atmosphere of pressure.
3.2.RUN Mode
Normal Operation
The Model 2002 will automatically enter RUN mode upon
A/D Speed Adjust
The Model 2002 utilizes a 24 bit
While in the RUN mode, the user can adjust the A/D speed of operation. At
To adjust the A/D speed, press the MODE switch until the RUN light is illuminated. Then simultaneously press the up and down switches. The RUN light will now flash indicating that the interlock has been bypassed and the A/D speed can be adjusted. Push the up switch to speed up the A/D converter one step and decrease the response time. This will result in a faster triggering of alarms or relays if a sudden catastrophic failure occurs. Pressing the switch after the limit is reached has no effect.
Pushing the down switch will slow down the A/D converter and increase its accuracy. This will improve the ability to resolve low pressure readings. If a certain speed is desired, press the UP or DOWN switch three times and then press the other switch to select the other speed.
On older units. There will be no indication of the operating speed other than the least significant digits of the display will tend to run at higher speeds. On units with software version 1.60 and above, press the ZERO switch to display the decimation ratio (filtering). The larger the ratio, the longer the response time.
EEPROM Calibration Restoration
There are interlocks built into the CAL mode to minimize the chance of accidental alteration of the calibration coefficients, but if calibration alteration does occur, the EEPROM calibration data can be restored in the RUN mode by pressing the UP and DOWN switches simultaneously (RUN light will flash), then press the “ZERO” switch, UP and DOWN switches (all three) simultaneously.
Page 9 of 38 |