Setting Up The Model 101 - Measurement Computing 101 Operating Manual

Setting Up the Model 101

To setup CH1, CH2 or CH3, perform the following steps in the sequence shown.
Step 1: Set Vexc
1. Set the GAIN/EXCITATION Thumbwheel Switch (SW1) to desired Vexc.
Note: If the Thumbwheel Switch is set to a value >12.00, Vexc will be 12.10 Vdc.
For 0.00 < or = Thumbwheel Switch Setting < or = 12.00, Vexc will be equal to
the Thumbwheel Switch Setting, when selected.
2. Depress the Channel Select Switch for CH1, CH2 or CH3. The appropriate Channel Select
LED will illuminate and stay illuminated.
3. Depress the SET Vexc Switch (SW6). The Channel Select LED will extinguish and Vexc for
the selected channel will be set to the Thumbwheel Switch setting.
Example: Set Thumbwheel Switch to 009.75. Depress CH2 switch, then the SET Vexc
Switch. Vexc for CH2 should be 9.75Vdc +/-1%.
Step 2: Set Amplifier Gain
1. Set the GAIN/EXCITATION Thumbwheel Switch (SW1) to desired amplifier gain.
Note: The amplifier gain can be set anywhere from 0.00 to 999.9.
2. Depress the Channel Select Switch for CH1, CH2, or CH3. The appropriate Channel Select
LED will illuminate and stay illuminated.
3. Depress the SET GAIN Switch (SW5). The Channel Select LED will extinguish and the
selected channel gain will be set to the Thumbwheel Switch setting.
Example: Set the GAIN/EXCITATION Thumbwheel Switch to 075.00. Depress CH2 switch,
then the SET GAIN switch. CH2 gain will be set to 75.00.
Step 3: Zero the Amplifier
1. Verify the input to the appropriate channel is the desired input to be zeroed.
Note: Any DC input signal, within the specified operating range of the amplifier can be
zeroed.
2. Depress the Channel Select Switch CH1, CH2, or CH3. The appropriate Channel Select LED
will illuminate and stay illuminated.
3. Depress and release the ZERO Switch (SW4).
4. The amplifier, under microprocessor control, will first zero the output of the input amplifier,
then zero the output of the output amplifier. The output will be 0.00 +/- 0.050Vdc (typ).
Operating Manual Model 101, Revision 1 Page 11 of 14