Overview
This is a sound card based dual channel Multimeter, providing the following types of digital displays:
- RMS
- dBV
- dBu
- dBSPL
- dB(A)
- dB(B)
- dB(C)
- Frequency Counter
- RPM (Revolutions Per Minute)
- Counter
- Duty Cycle
- F/V (Frequency Voltage Conversion)
The latter five involves a pulse counting process, and the software allows you to configure the counter trigger level and trigger hysteresis in order to rectify the analog signal to rectangular pulses before counting. The frequency dividing ratio can also be configured.
The toggle button  in the Instrument Toolbar is used to open or close the Multimeter. You can also close it by clicking the "Close" button at the upper right corner of the Multimeter window.
| 
