Dolby Laboratories 737 Manuale Utente

Model 737 Soundtrack Loudness Meter - Leq(m) 

Operation and Features

2-4

Figure 2-5 Mon and DC Out, and power/control connector

Mon Out is an unbalanced output which, in calibration mode, provides an unweighted 
mono mix of channels. In measurement mode, Mon Out carries a mono mix of the outputs 
of the weighting filters. Listening to the filtered output can help the mixer find the effect 
or equalizer setting that is raising the average above the standard. Mon Out is adjustable 
on the front panel from -20 to 0 dBu for Dolby Level so that it can be balanced with the 
studio monitor level. 

Mon Out uses the following wiring convention:

Table 2-2  Mon Out wiring convention 

DC Out is an unbalanced output to drive an optional moving coil meter/chart recorder. 
Using a 1 mA moving coil meter with a calibrating potentiometer across its terminals 
is a useful method to observe measurement trends. DC Out uses the following wiring 
convention:

Table 2-3  DC Out wiring convention 

1 V is equivalent to 91 Leq(m); the range is 0–1.25 VDC; 0 VDC corresponds to 
70 Leq(m); output resistance is 1 k

Ω.

1

Chassis

2

Mon signal out

3

Mon signal common

1

Chassis

2

DC out

3

DC return

Mon Out

DC Out

24Vac

500mA

AC

In

~

AC

In

~

Ref

Gnd

Trip

Out
Trip

Out
Trip

Out

Gnd

Start

/S

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Model 737