• -20 to +3 vu,  :   Class 1.5
• 0-100 %,  :   Class 1.5

•  :   

• 12VDC

• Distinctive ‘retro’ styling with contemporary construction
• High performance at an affordable price
• Internal LED Illumination
• Suitable for 1U rack mounted applications
• RoHS Compliant

Specification

A low range ac voltmeter suitable for connecting across a 600 ohm line and self contained except for requiring an external 3.6k ohm resistor. Calibrated for use with a 3.6k ohm resistor 4vu above the scale marking so that the reference deflection (0vu) is produced by a signal 4vu above 1 m W in 600 ohms (1.228V).

The performance of the meter is based upon the requirements of BS 6840: Part 17:1991,IEC 268 – 17 1990. The dynamic characteristics quoted, which requires the response time to 99% of reference deflection (0vu) to be 0.3 seconds +/- 100% with an overswing of at least 1.0% but not more than 1.5% are not fully met.

The overswing, because damping is not so tightly controlled but allowed to spread within normal design restraints, can vary between deadbeat to 5%. To specify the dynamic characteristics in terms of time to 99% of 0vu under such circumstances would give an unrepresentative, measure of the speed of response. For this reason the time to reach –3vu with a steady reading of reference deflection (0vu) has been taken as a more realistic measure

The following comparison can be made based on a rise time to –3vu with steady deflection of 0vu:

• IEC = 0.13 – 0.15 Seconds
• AL19 Retro = 0.14 - 0.18 Seconds