FCT 08
System Software
5-9
The A/D (Analog-to-Digital) Zero Test
displays the analog count of output
channels 1 and 2. If the A/D converter is functioning properly, these values
should be nearly identical (approximately 32,700).
The A/D (Analog-to-Digital) Span Test
displays the analog count of output
channels 1 and 2, as well as the analog count and actual mV output of the
CO
2
, Temperature, and Auxiliary output channels.
The RAM (Random Access Memory) Test
shows the amount of available
system RAM. The LI-6252 has approximately 8K bytes of RAM.
The EEPROM (Electrically Erasable Programmable Read-Only
Memory) Test
shows the amount of available ROM memory. The system
parameters entered by the user are stored in EEPROM. The LI-6262 has
approximately 32K bytes of ROM program memory.
Geopotential
- Displays the geopotential height in feet or meters, based on
the current value of pressure at channel 43. This value can be provided by a
sensor (FCT 73) or as a keyboard entered constant (FCT 77). Press the up or
down arrow keys to toggle between units of feet and meters. Geopotential
height is height above sea level in a standard atmosphere.
The I/O (Input/Output) Test
checks the Input/Output capabilities of the
RS-232C port. This test requires pins 2 and 3 to be shorted on the RS-232C
connector.
CO2 Zero/Span
- Provides a method to set the CO
2
zero and span in
software, via the keypad or by sending a remote command sequence. See
Section 4.6,
Setting the Zero and Span in Software
, for more information.
H2O Zero/Span
- Provides a method to set the H
2
O zero and span in
software, via the keypad or by sending a remote command sequence. See
Section 4.6,
Setting the Zero and Span in Software
, for more information.
