8
Setting up the Model 123
Verify the POWER ON/OFF switch is in the OFF position and the POWER INPUT SELECTOR SWITCH
is set to the proper input power voltage prior to making any input or output connections to the instrument.
1.
Connect sensor to its proper inputs (PE/IEPE).
2.
Connect outputs.
3.
Disable the High Pass (HP) and Low Pass (LP) filters by selecting HP OUT and LP OUT on the
rear panel.
4.
Set the appropriate input type (PE/IEPE) on the rear panel.
5.
If using IEPE sensors, set the appropriate IEPE current source value.
6.
Connect AC power to the instrument.
7.
Turn POWER ON/OFF switch ON.
8.
Verify the following on the front panel.
a.
POWER LED illuminates.
b.
The appropriate PE or IEPE LEDS illuminate.
c.
HP and LP filter LEDs are OFF.
Calculating/Setting Gain
1.
To allow the instrument to calculate the gain for CH1, perform the following.
a.
Set the SENSITIVITY/GAIN (SW1) thumbwheel switch to the transducer sensitivity.
Example: If the PE or IEPE transducer has a sensitivity of 10.52 pC/g or mV/g, set
the SENSITIVITY/GAIN thumbwheel switch to 0010.52.
b.
Depress CH1 (SW5) switch momentarily. The CH1 LED will illuminate.
c.
Depress ENTER (SW2) switch for INPUT SENSITIVITY. The instrument will store the
INPUT SENSITIVITY value for CH1 in non-volatile memory for use in calculating the gain
setting. The CH1 LED will extinguish.
d.
Set the SENSITIVITY/GAIN (SW1) thumbwheel switch for the desired output sensitivity.
Example: If an OUTPUT SENSITIVITY of 100mV/g is desired, set the
SENSITIVITY/GAIN switch to 0100.0.
e.
Depress CH1 (SW5) switch momentarily. The CH1 LED will illuminate.
f.
Depress ENTER (SW3) switch for OUTPUT SENSITIVITY. The instrument will store the
OUTPUT SENSITIVITY value for CH1 in non-volatile memory for use in calculating the
gain setting. The CH1 LED will extinguish.
Note: The INPUT SENSITIVITY and OUTPUT SENSITIVITY for CH1 is entered and set.
The instrument is now ready to calculate CH1’s gain based on these settings. If these
values are not updated, they will continue to be used whenever the instrument is asked to
calculate CH1’s gain.
