The Level Meter LM11 is a handheld battery powered instrument for testing Voice Frequency transmission circuits. The main characteristic of the LM11 is the large number of facilities provided in such a small package.

Great care has been taken to achieve easy operation of this instrument. All functions are activated by one button. Most instruments of this complexity revert to menu tree mode selection thereby necessitating handbook guidance or on screen help. The LM11 can be operated without these aids.

The following features are provided:

• 85 hours operation with dry cells
• Battery voltage monitor
• 20 kHz level meter (ITU-T O Supp 3.1)
• Noise meter (ITU-T O.41)
• 820 Hz notch filter for quantizing noise (ITU-T O.132)
• Noise with Tone (ITU-T O.41)
• Frequency shift measurement
• 820 Hz 0 dBm,-10 dBm oscillator
• 600 W , 1200 W and 100 kW impedance
• Audio monitor