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IM133, Page 18
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1.
Select Function LED # 6 (LP Filter) and apply an approximately 3 Vrms at 300 Hz
calibration signal into the Charge and adjust the calibration signal amplitude input
so that the output signal is set to 6.0 VRMS.
2.
Press the LEFT or RIGHT edit push-buttons. The unit will display the raw
(uncalibrated) voltage read by the A/D for about 3 seconds (a number between 5
and 7). Then, waiting for about 5 seconds, the unit will change the gain to 1, and
will display the calibration constant for the slope of the A/D.
3.
Select Function LED # 7 (Monitoring State). The unit will display the calibration
constant for the offset of the A/D.
8. Trouble Shooting Mode
This special mode selection allows the user to control any digital I/O port for troubleshooting
purposes.
This special mode is selected by pressing the “Select Function” push button while simultaneously
pressing the UP and DOWN EDIT push buttons. Pressing the “Select Function” push-button while
the “Monitoring State” function LED is flashing places the unit back into Normal mode.
2.4.6 Fault Indication
There are three (3) fault indicators (red LEDs) for each channel located on the front panel. The
fault indicator will turn on if the ISOTRON input is either open or short circuited, while the input
select function for the corresponding channel is set to ISOTRON, and the Current Exc. is turned
on (4 or 10 mA).
2.4.7
RS-232 Serial Communication
The unit has a standard RS-232 serial interface available through an RJ-11 connector located on
the rear panel (see Figures 3, 5 and 6).
In the accessories section of this manual lists all options available options for serial communication.
The Serial Communication Kit contains the necessary items to control up to three units. Should
additional units be added for serial communication additional cables and RJ-11 adapters would be
required.
Figure 5 shows how to connect a computer to control up to 16 Model 133 amplifiers. The following
functions can be executed through the serial interface from a controller:
1.
Identification of the unit: Model Number (133, 136, etc.), firmware revision, address.
2.
Send settings for all of the 7 functions programmable through the front panel.
3.
Query settings for all of the 7 functions programmable through the front panel.
4.
Send calibration constants. The new calibration constant will take effect immediately
and it will be stored into non-volatile memory.
5.
Query calibration constants.
6.
Query raw and calibrated output RMS data from A/D.
7.
Query corner frequency of installed low pass filter.
8.
Query error list.
9.
Reset the unit.
