Measurement Computing 101 Operating Manual page 12

Step 4: Trimming the Zero output
Note: Trimming allows the user to zero the output of the selected channel to within
±1mVDC. This trimmed value may then be stored in non-volatile memory and
reapplied upon power turn on.
1. Perform Step 3: Zero the Amplifier.
2. Depress and hold depressed, the Channel Select Switch for CH1, CH2 or CH3. The
appropriate Channel Select LED will illuminate and stay illuminated.
3. To increment the output zero by 1 count of the output zero DAC, set the GAIN/EXCITATION
Thumbwheel Switch (SW1) to " 0 0 0. 0 1 ".
To decrement the output zero by 1 count of the output zero DAC, set the GAIN/EXCITATION
Thumbwheel Switch (SW1) to " 0 0 1. 0 1 ".
4. Depress the ZERO switch. The output zero will increment or decrement by 1 count of the
output zero DAC. Successive depressions of the ZERO switch will continue to increment or
decrement the output zero.
Note: To increment the output zero by (x) counts of the output zero DAC, set the
GAIN/EXCITATION Thumbwheel Switch (SW1) to " 0 0 0. 0 x " and depress the
ZERO switch.
To decrement the output zero by (x) counts of the output zero DAC, set the
GAIN/EXCITATION Thumbwheel Switch (SW1) to " 0 0 1. 0 x " and depress the
ZERO switch.
5. To save the trimmed zero value in non-volatile memory, depress and hold depressed the
Channel Select switch again. The selected channel LED will extinguish. The trimmed zero
value will be stored in non-volatile memory.
Note: If any other channel is selected before the selected channel switch is depressed
and held, the trimmed zero value will not be saved and the previously stored
zero value will be used at power up.
Operating Manual Model 101, Revision 1 Page 12 of 14