Appendix
41
7.8
Test Mode
In addition to normal and setup modes, test mode
provides a number of diagnostic functions for the IQ
plus 350, including:
•
Display raw A/D count
•
Display digital input states
•
Reset configuration parameters to default
values
•
Transmit test character (“U”) from serial port
•
Display characters received by serial port
•
Set analog output state to zero or full scale
•
Set A/D offset and gain calibration
To enter test mode, press and hold the setup switch
until the front panel display shows the word
TEST
.
After about three seconds, the test mode display
automatically shifts to the first test menu function, A/
DTST.
A/D calibration functions, ADOFFS
and ADGAIN, must be used only by
qualified service personnel, and only
after replacing A/D converter components. Improper A/D
calibration may render the indicator unusable.
Figure 7-5 shows the Test Menu structure; Figure 7-6
shows the front panel key functions in test mode. Note
that, because the Test Menu functions are all on a
single menu level, the
GROSS/NET
( ) key has no
function. Press the
ZERO
( ) key to exit test mode.
Table 7-7 on page 42 summarizes the test menu
functions.
Figure 7-5. Test Menu
Figure 7-6. Front Panel Key Functions in Test Mode
Caution
A/DTST
ADOFFS
ADGAIN
TEST
D/I 1
D/I 2
AOUT=0
AOUTFS
DEFLT
XMT U
ECHO R
ZERO
GROSS
NET
TARE
UNITS
B/N
Units
Move LEFT
Move RIGHT
EXIT
not used
ENTER
TEST MODE KEY FUNCTIONS
