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AIM-16 Manual
Page 2-12
Manual MAIM-16.D1d
Calibration and Test
All ACCES cards are calibrated prior to shipment. However, periodic calibration of AIM-16 is
recommended to retain full accuracy. The calibration interval depends to a large extent on the type
of service that the card is subjected to. For environments where there are frequent large changes of
temperature and/or vibration, a three-month interval is suggested. For laboratory or office conditions,
six months to a year is acceptable.
A 4-1/2 digit digital multimeter is required as a minimum to perform satisfactory calibration. Also,
a voltage calibrator or a stable, noise-free, DC voltage source that can be used in conjunction with the
digital multimeter is required.
Calibration is performed using the SETMUX program supplied with the AD12-8. This program will
lead you through the set up and calibration procedure with prompts and graphic displays that show
the settings and adjustment trim pots. This calibration program also serves as a useful test of the
AIM-16 functions and can aid in troubleshooting if problems arise.
Calibration Procedure
The AIM-16 card has five potentiometers RP1 through RP5, which are used for calibration. These
potentiometers have the following functions:
d. RP1 sets an output offset of the programmable gain amplifier (U13) to zero.
e. RP2 sets an input offset of the programmable gain amplifier (U13) to zero.
f. RP3 sets the level of the +10V regulated supply.
g. RP4 sets the output of the local reference junction temperature sensor.
h. RP5 is a fine gain adjust and provides precise gain setting capability.
The following procedure is brief and is intended for use in conjunction with the calibration part of the
SETMUX program.
1. Start the calibration program by typing SETMUX and press the ENTER key at the DOS
prompt.
2. Use the relevant menu selection to assign your AIM-16 to a channel of the AD12-8.
3. Use the arrow key to select option 6) Calibrate MUX, then press the ENTER key.
4. Now select which AIM-16 to calibrate and press ENTER.
5. You will be presented with an initial setup for the AIM-16, ensure that your card is set this
way then press ENTER.
6. Use the arrow key to select option 1. Adjust RP3, from the menu at the top left hand corner
of the screen.
7. Following the instructions on the screen, perform the RP3 adjustment
8. Repeat steps 6) and 7) for RP4, RP1, RP2, and RP5.
9. This completes the calibration procedure.