View Parameters

View parameters determine how the collected data are analyzed and displayed. There are 12 types of views, as shown in the above figure.

RMS

Under this mode, the Multimeter displays the RMS values of the current frame of data, which are the same as the ones displayed in the Oscilloscope but with bigger font. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable.

dBV

Under this mode, the Multimeter displays the dBV values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable.

dBu

Under this mode, the Multimeter displays the dBu values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable.

dBSPL

Under this mode, the Multimeter displays the dBSPL values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable.

dB(A)

Under this mode, the Multimeter displays the dB(A) values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable. Note that the Spectrum Analyzer will be forced to display Amplitude Spectrum with A weighting.

dB(B)

Under this mode, the Multimeter displays the dB(B) values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable. Note that the Spectrum Analyzer will be forced to display Amplitude Spectrum with B weighting.

dB(C)

Under this mode, the Multimeter displays the dB(C) values of the current frame of data. You can display or hide the value for any channel. The rest of the view parameters in the view parameter toolbar are not applicable. Note that the Spectrum Analyzer will be forced to display Amplitude Spectrum with C weighting.

Frequency Counter

Under this mode, the Multimeter displays the counted frequency values of the current frame of data. You can display or hide the value for any channel.

You can also set the Counter Trigger Level and Counter Trigger Hysteresis as well as the ratio of the Frequency Divider. The Counter Trigger Level and Counter Trigger Hysteresis are useful parameters under the Frequency Counter, RPM, Counter, Duty Cycle and F/V modes. They are used as parameters to rectify the analog signal in the Oscilloscope to rectangular pulses before the counting process. They behave in a similar way as the Trigger Level and Trigger Hysteresis of an electronic Schmitt trigger, except that they are relative values which vary with the maximum and minimum values detected in the current frame of data. The Counter Trigger Level can be adjusted from –100% to 100%, with -100% corresponding to the minimum value and 100% corresponding to the maximum value. The Counter Trigger Hysteresis can be adjusted within 0 ~ 100% of the actual range of the frame of data, i.e. [the maximum value]-[the minimum value]. These two parameters are visualized as two markers along the vertical axes in the Oscilloscope, as shown in the following figure. The markers on A axis are for Channel A, and the markers on B axis are for Channel B.

In the figure, the signals in both channels are a 1 kHz sine wave mixed with a white noise at an amplitude ratio of 5:1. The Counter Trigger Level and Counter Trigger Hysteresis for Channel A are 50% and 0% respectively. In contrast, they are 50% and 20% respectively for Channel B. The Multimeter measures a frequency of 1457.355 Hz for Channel A which is incorrect due to the fluctuation caused by the white noise component. For Channel B, the measured frequency is 999.930 Hz which is very accurate. Thus, setting a proper hysteresis value is important when there are noises present in the signal.

RPM

Under this mode, the Multimeter displays the RPM (Revolutions Per Minute) values of the current frame of data. You can display or hide the value for any channel.

The Counter Trigger Level, Counter Trigger Hysteresis and Frequency Divider are applicable to this mode.

Counter

Under this mode, the Multimeter displays the total counts of the current frame of data. You can display or hide the value for any channel.

The Counter Trigger Level, Counter Trigger Hysteresis and Frequency Divider are applicable to this mode.

Duty Cycle

Under this mode, the Multimeter displays the duty cycle values of the current frame of data. You can display or hide the value for any channel.

The Counter Trigger Level and Counter Trigger Hysteresis are applicable to this mode.

F/V

Under this mode, the Multimeter displays the voltage values after performing frequency counting and subsequent frequency/voltage conversion of the current frame of data. You can display or hide the value for any channel. The frequency/voltage conversion factors are configured as described previously in the section “Frequency Voltage Conversion Factor”.

The Counter Trigger Level, Counter Trigger Hysteresis and Frequency Divider are applicable to this mode.