54
High Frequency Calibration
For high frequency calibration of microphones, microphone sets, or preamplifiers, you
must use a signal generator and a digital multimeter capable of dealing with high
frequencies, for example these models provided by Keysight, or instruments with similar
specifications:
• 33210A or 35500B Signal Generator
• 34465A
Digital Multimeter
Connecting the 33210A or 35500B Signal Generator and the 34465A Digital
Multimeter.
1. Use a BNC cable to connect the output of 33210A (35500B) to the “Output
Signal” (output from generator) on the RA0192.
2. Use an RS-232 cable (Null Modem) to connect the 33210A (35500B) to the
computer.
3. Configure the 33210A (35500B) as follows so it can communicate with the
computer. Under the I/O menu, add the following information:
Interface
RS-232
Baudrate
9600
Parity
None: 8 Bits
For more information, see the 33210A (35500B) manual.
4. Use a BNC cable to connect the input of 34410 to the “Input Signal” (input for
multimeter) on the RA0192.
5. Use an RS-232 cable (Null Modem) to connect the 34465A to the computer.
6. Configure the 34410 as follows so it can communicate with the computer. Under
the I/O menu, add the following information:
Interface
RS-232
Baudrate
9600
Parity
None: 8 Bits
For more information, see the 34410 manual.
7.
Go to the setup file and enter the correct COM port for the 33120A and 34465A,
and enter the “Cut-off Frequency” (the frequency where the system starts to use the
external signal generator and multimeter); save the file.
When the setup is configured correctly and the connection of the signal generator and
the multimeter is done, the system is ready for high frequency calibration.