Setting The Ppm Mode And Ballistics; Setting The Vu Display Range; Table 7-1: Ppm Bar Graph Characteristics - evertz 7735CEM Manual

7.7.4. Setting the PPM Mode and Ballistics

Bar graphs
Bar graphs 1 and 2
PPM mode
DIN,
BBC,
Nordic N9,
AES/EBU
Mode Attack
Time
DIN 45 406 10 ms
(IRT Rec. 3/6)
BBC "IEC 128-10, 10 ms
type IIa, fast mode
Nordic N9 5 ms
AES/ EBU 1
sample
period
The phase correlation scale on the DIN type is different from our other phase
indicators (Sum + Diff and phase bar graphs).

7.7.5. Setting the VU Display Range

Bar graphs
Bar graphs 1 and 2
VU range
Normal
Extended
Gray background indicate un-implemented or un-tested features
This parameter selects one of four industry standard of Peak Program
Meter (PPM) display modes.
When one of these modes is selected, a number of items are set to adhere
with predefined industry standards. The items affected include; meter
attack time, meter decay time, min level displayed, max level displayed,
analog reference (100%) level and, in some instances, region colouring
and phase graph representation. Table 7-1 illustrates the values set by the
standards.
Decay Ref. Min
Time Level Level
1.5 sec 6 dBu -50 dB
for
20 dB
2.8 sec 8 dBu
for 7 to 1 -12 dB
1.7 sec 6 dBu -42 dB
for
20 dB
1.5 sec User -60 dB
for defined
20 dB

Table 7-1: PPM Bar Graph Characteristics

This parameter selects the VU display range when VU modes are active.
Most VU meters have two possible ranges. These are:
Normal range: +3 to –20dB
Extended range: +3 to –57dB
The bar graphs will be re-scaled to represent the selected range.
When using VU and BBC PPM mode, the VU scale is truncated to
–6dB to match the scaling of BBC mode.
Revision 1.1.1
7735CEM Composite Encoder with Monitoring
Max Peak
Level Output
Level
5 dB 6 +
headroom
1 7 8 +
+12 dB headroom
+12 dB 6 +
headroom
0 dB User
defined
7700 MultiFrame Manual
Notes
1 dB per div until –10 dB,
logarithmic to bottom -50dB.
Associated DIN phase
correlation scale:
• both the same => 1 r,
• only 1 signal => 0 r,
• both out of phase => -1r.
# 6 on the scale is the
reference level
100% reading is user
definable.
0 dB corresponds to 0 dB
FS.
7735CEM-31