Appendix
69
10.7 Analog Output Calibration
The following calibration procedure requires a
multimeter to measure voltage or current output from
the analog output module. If the option is not already
installed, see Section 2.4 on page 6.
NOTE:
The analog output must be calibrated
after
the
indicator itself has been configured (Section 3.0) and
calibrated (Section 4.0).
Figure 10-5. Analog Output Menu
1. Enter setup mode and go to the ALGOUT
•
Set OFFSET to 0% for 0–10 V output,
20% for 4–20 mA output
•
Set MIN to lowest weight value to be
tracked by the analog output
•
Set MAX to highest weight value to be
tracked by the analog output
2. Connect multimeter to connector J1 on the
analog output board:
•
For voltage output, connect voltmeter
leads to pins 3 and 4
•
For current output, connect ammeter
leads to pins 1 and 2
3. Adjust zero calibration: Scroll to the
TWZERO parameter. Check voltage or
current reading on multimeter. Press and hold
or to adjust the zero value up or down.
4. Adjust span calibration: Scroll to the
TWSPAN parameter. Check voltage or
current reading on multimeter. Press and hold
or to adjust the span value up or down.
5. Final zero calibration: Return to the
TWZERO parameter and verify that the zero
calibration has not drifted. Press and hold
or to re-adjust the zero value as required.
10.8 Test Mode
In addition to normal and setup modes, test mode
provides a number of diagnostic functions for the IQ
plus 710, including:
•
Display raw A/D count
•
Set digital outputs on and display digital input
states
•
Reset configuration parameters to default
values
•
Clear non-volatile (battery backed) storage
•
Clear EEPROM
•
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
. In
test mode, the front panel keys are mapped to the test
m o d e f u n c t i o n s a s s h ow n i n F i g u r e 1 0 - 6 a n d
Table 10-6 on page 70.
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.
The CLEAR EEPROM function erases both A/D and load
cell calibration data. The A/D converter and the scale
must be recalibrated after using this function.
XXXXXXX
XXXXXXX
ALGOUT
DIG IN
SETPNTS
XXXXXXX
PROGRM
PFORMT
SERIAL
CALIBR
XXXXXXX
CONFIG
FORMAT
SOURCE
GROSS
0%
20%
OFFSET
ERRACT
FULLSC
HOLD
000000
number
MIN
10000
number
MAX
TWZERO
NET
TWSPAN
ZEROSC
XXXXXXX
VERS
Caution