MULTICHANNEL SIGNAL CONDITIONER MODEL 482C27 GENERAL OPERATION MANUAL
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The coupling options are AC or DC. In DC coupling mode the auto zero and auto balance functions become available.
Auto zero is for all input types and auto balance is for the Differential Voltage and Bridge (full, half and quarter) input
types.
8) Auto Zero/ Auto Balance (ZERO on front panel):
482C27 includes an auto zero function for automatically zeroing channel outputs for any channel in DC coupling mode
(zeroing works for any sensor input type). The auto balance function works for channels that are set to differential
voltage, bridge (quarter, full, half), RSE and NRSE input modes ONLY (when DC coupling is enabled). Both zeroing
functions are not available when a channel is AC coupled. The auto zero function disconnects the input and uses a DAC
to reduce the channel output to close to 0V. The balance option does the same but leaves the input connected.
EXCi
EXCv
FLTo
ACDC ZERO ARNG
When the ENTER button is pressed, the submenu for the coupling options will include;
Cancel, AUTOBAL,
AUTOZERO
. The selection can be changed by using the up
or down
buttons.
Chan
AUTOZERO
1
AUTOBAL
NOTE:
If the zero function fails either the message “Error Removing MainBd DC Offset” or “Error Removing Bridge
DC Offset” will be displayed depending on the situation. For gains less than 500 the function tries to get below 2mV
output and gains less than or equal to 500, 50mV is the limit.
9) Auto Range (ARNG on front panel):
The auto range (also referred to as auto scale) feature provides an automatic scaling of the output signal. Please refer to
section 3-6.1 for further description. With this command, the programmable gain is implemented to give .8 of the full
scale output. The signals are checked internally using the onboard A/D. To use this feature, place the cursor over
“ARNG” on the display and press the ENTER key, the following submenu will appear.
EXCi
EXCv
FLTo
ACDC ZERO ARNG
Use the up
or down
arrow keys to toggle between the ‘OFF’, ‘ON’ or ‘IMED’ options. Once you have set the auto
scale option, hit the ENTER key to return to the main menu. ON turns the auto scale function ON and it will continue
scaling the gain until it is manually turned off. The ‘IMED’ option runs through the auto scale algorithm once and then
turns it off automatically.
