Atek 10002iX, Руководство пользователя, Страница: 235 / 259

User Manual California Instruments
9.7.6Installation
The INA 2145 module can be installed inside a system cabinet or other vertical structure in the
vicinity of the iX power source. Refer to Figure 9-126 and Figure 9-127 for connection details.
The input voltage can be applied to the AC input terminal strip as shown, or, banana jacks can
be used to secure the line voltage to the INA 2145 module. The system interface ribbon cable
can be connected to either of the two connectors on the INA 2145 module. The extra connector
is provided for pass-through connectivity.
9.7.7INA 2145 Option Operation
The External Line Sync option (INA 2145) allows the output of the i/iX AC Source to be
synchronized to any line input, whether it is the line powering the iX source or any other line
voltage not necessarily hooked up to the iX source. This capability may be needed to support
tests that require the use of additional equipment.
The INA 2145 Option – once installed and connected – can be turned on from the iX front panel
as follows:
Select the PROGRAM 2 screen and move the cursor to the CLK MODE field. The default value
for the field is INT for internal clock mode. Use the knob to select the SYNC mode in order to
enable the INA 2145. If the INA 2145 is not installed a “LINE SYNC ERROR” will appear after a
short period in the top left of the screen. This means the INA 2145 option is either not present or
not receiving a phase input signal from the line.
To turn the sync mode back off, set the CLK MODE field back to INT.
Over the bus, the INA 2145 is enabled or disabled as follows:
FREQ:MODE SENS /* Enables INA 2145 */
FREQ:MODE FIX /* Disables INA 2145 */
If the INA 2145 is not installed and the FREQ:MODE SENS command is issued, an error
message is generated. If done as part of a test program, an error check should be done after a
800 msec delay to allow the i/iX to sense the presence of a sync signal coming from the INA
2145 module. If no error occurs, the INA 2145 is active. If an error occurs, the INA 2145 may
not be available or not functioning and the mode has reverted back to internal.
The INA 2145 option is designed to keep the iX output frequency locked to the line frequency.
There is a finite phase offset however, between the iX source output and the line input to the
External Sync Module. This phase offset will vary somewhat with the line voltage going to the INA
2145 module. If it is desired to have the iX output in phase with the line input, it will be necessary
to monitor the iX output voltage as well as the line input to the INA 2145 module using a two
channel oscilloscope to compare the zero-crossings of the voltage waveforms. An isolation
amplifier must be used when connecting the sync input line to the o’scope input. To program an
offset angle on the iX source, go to PROGRAM 2 screen and select PHASE. Typically 25-30 of
phase angle will put the line input and the source output in-phase, but the exact angle to program
can only be determined by monitoring the iX source and the line input voltage and comparing the
waveforms.
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