Dolby Laboratories 737 - Manual (Page 11)

Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features
2-4
2.2.2 Mon Out
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
2.2.3 DC Out
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.
Pin Connection
1 Chassis
2 Mon signal out
3 Mon signal common
Pin Connection
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
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