PPM-2
PEAK PROGRAMME METER
The ppm-2 audio level meter is a simple way of measuring audio levels of both analog and digital signals. The meter has two analog inputs (balanced or unbalanced), AES/EBU and S/PDIF. The unit is highly configurable via a multifunction knob and easy to read via the high contrast, high viewing angle OLED-display. The instrument is housed in a durable aluminum cabinet.
The meter accepts both balanced and unbalanced analog audio.
The digital inputs accept both balanced digital audio according to IEC-60958 Type I (AES/EBU) and unbalanced digital audio according to IEC-60958 Type II (S/PDIF). The two different connectors are separated which means that the user can connects both inputs simultaneously. The two S/PDIF connectors are internally connected allowing the user to pass the signal to other devices.
The user interface consists of one multifunction knob, one OLED-Display, one clear button and one ON/OFF switch. The multifunction knob is used to navigate in the menu. When the device is switched on it instantly starts to measure the audio level on the selected input.
The default screen is illustrated above. The default screen contains a level indicator for left and right channels, a decibel scale, left and right maximum value and two small dB symbols with different signs. The -dB and +dB is used to indicate if the scale starts or ends at negative or positive values.
The main menu consists of 10 different main items, which allows the user to configure the meter in different modes.
The menu items are listed below in order of appearance.
- INPUT
- DIGITAL TERMINATION
- MEASURE
- RMS INTEGRATION FACTOR
- REFERENCE
- SCALE RESOLUTION
- SCALE START
- MAX HOLD
- MAX DISPLAY
- VIEW
The clear button is user to reset the maximum value; it also freezes the current value while the user is holding the clear button down.
If the user turns off the device, the current settings are saved.
MAX DISPLAY
This option can change the way the maximum indication disappears. The options are “fade away” and “fall off”. When “fade away” is selected the maximum indication fades away at the current position and when “fall off” the maximum indication falls off (moving towards the left). The maximum indication is also presented as a numerical value illustrated below.
| Supply voltage | 5 VDC |
| Current consumption | 150 mA typ. |
| Balanced analog input | |
| Connector | XLR Female |
| Input impedance | 20kΩ |
| Reference input level | -10dBu |
| Maximum input level | +20dBu |
| Frequency range | 20Hz – 20kHz |
| Dynamic range | 60dB |
| Unbalanced analog input | |
| Connector | RCA Female |
| Input impedance | 10kΩ |
| Reference input level | -10dBu |
| Maximum input level | +20dBu |
| Frequency range | 20Hz – 20kHz |
| Dynamic range | 60dB |
| AES/EBU input | |
| Connector | XLR Female |
| Input type | IEC 60958 Type 1 |
| Input impedance | High Z or 110Ω |
| Standard sampling rates | 44.1kHz, 48kHz and 96kHz |
| S/PDIF input | |
| Connector | RCA x2 (pass thru) |
| Input type | IEC 60958 Type 2 |
| Input impedance | High Z or 75Ω |
| Sampling rates | 44.1kHz, 48kHz and 96kHz |
| Measuring characteristics | |
| Maximum level error (1kHz steady signal) | ±1dB |
| Maximum unregistered pulse length (worst case) | ≈6ms* |
| Falloff time (peak mode, scale resolution = 3dB) | . 3dB/60ms |
| Maximum integration time (rms mode) | ≈500ms* |
(*) Depends on the input signal.
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PPM-2 data sheet |
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