Internationally, it is also called QPPM (Quasi-Peak Programme Meter).
There is no uniform standard of Peak Programme Meter (PPM) in the international. The peak table specified by the original DIN (German Industrial Standard) was recognized by the IEC in the 1970s and named as the I-type peak meter. It is on the quasi-logarithmic scale from -40dB to +5dB. For the effective scale area, take the 0dB reference point around 90% of the full scale. The sensitivity of this reference point is equivalent to +6dBu or 1.55v rms, and the scale unit is PPU (peak volume meter unit).
British BBC radio station's peak meter range is -12 ~ +12dB, but its scale is represented by the number 1 ~ 7, each number interval is 4dB level change, the number 6 is the reference point, the sensitivity is +8dBu sine wave rms value The IEC named it a type II peak table.
Dynamic characteristics of the peak table: Take the versatile I-type peak table as an example. The rise time of the -1dB (90%) scale is 10 milliseconds, and the recovery time from 0dB to -20dB (10%) is in 1.5 seconds, the recovery time to -40dB (1%) is 2.5 seconds, and the overshoot swing does not exceed +0.3dB. The Type II peak meter produces an 80% full-scale deflection when excited by a 4 millisecond pulse with a fall time of 8.7 dB per second. The longer the recovery time of the peak table is deliberately made, so that the staff can read.
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