U70F Peak Programme Meter Operating Manual Rev. 2.00 JAN.
Important Safety Instructions 1. Do Not try to service this product yourself! It may expose you to dangerous high voltage and other risks. 2. Do Not operate this product near water. 3. Do Not place or operate near or over radiator or heat register. 4. Do Not expose this product to dampness, dust or corrosive liquids. 5. Do Not connect this product and Disconnect from wall socket during a lightning or thunderstorm 6.
Introduction Congratulations to your new U70F 2‐channel Peak Programme Meter (PPM). The name is the homage to the first PPM meter called U70, a tube based system developed and manufactured in Germany in the early 50s. Our new design uses advanced DSP technologies for improved performance and offers the following features: Î XLR balanced inputs and outputs Î The audio pass through feature simplifies the connection of the U70F Î Independent 60 LED scales with five Illuminated scale markers per channel.
Operating Instructions: The On/Off switch is located on the back‐panel close to the AC inlet. After turning the U70F on, the instrument will go through a test and calibration cycle. First a single dot will ascend and then invert and descend. The illumination of the 10 green LEDs will indicate the successful completion of this cycle and the instrument is then ready for normal operation. A failure of the self‐test and/or the calibration will be light the 10 red LEDs.
If the BAR switch is engaged and then disengaged within three seconds, there are three different modes can be sequentially selected: a) Simultaneous PPM Dot and RMS Bar Mode (Default mode after power‐up) b) PPM Dot Mode c) RMS Bar Mode Normally, if engage for more than 3 seconds, the BAR switch toggles between the Bar Mode and the selected Dot Mode. The U70F is only designed to work properly with balanced audio signals. Unbalanced signals will not be able to drive the meter above +4 dB on the scale.
Technical Data: Inputs and outputs balanced XLR connectors with audio pass‐through Insertion loss 0 dB Frequency response 20 Hz to 20 kHz ‐0.25 dB Peak Attack time < 10ms RMS Integration time 330ms Sampling frequency 200 kHz Release time 1.5s/20dB in 1dB/step, 2.25s/20dB in 0.5dB/step Maximum input level +28dBu Input impedance > 5 kΩ Standard calibration level +4 dBu (1.23V sine‐wave at 1kHz) for 0 dB reading Mains 90 – 240VAC, 50 – 60 Hz with IEC power‐cord Power consumption Max.
Appendix A: Calibration mode: Warning: Only trained qualified personnel may open covers and performs this procedure. To calibrate the U70F a precision, balanced output, amplitude jitter‐free sine‐wave generator, a small Philips screwdriver, and a very small flat‐head screwdriver are necessary. Step 1: Turn‐off the power switch located on the back‐panel. Disconnect the mains cord. Step 2: Open the top‐cover after removing all screws with a small Philips driver.
