8-12
Model 820 Technical Reference Manual
39
Detector
[Slow, Fast, Impl]
Slow: exponential avg: 1 second con-
stant.
Fast: exponential avg: 1/8 second con-
stant.
Impl: impulse response.
40
Frequency Weighting
[A,A16,C,C16]
A and C weightings meet Type 1 spec-
ifications. Note: A16 and C16 not
applicable to the Model 820.
41
AC Out Weighting
[Flat, Wght, F+20,
W+20]
F+20: Flat Level with 20 dB gain.
W+20: Weighted with 20 dB gain.
42
Unweighted Peak
[Flat, C]
43
Mic. Polarization
Voltage
[0, 28, 200]
This selects the polarization voltage
for the microphone. Chose 28 or 200
V for condenser type microphones and
0 V for pre-polarized microphones
(electret).
44
Reference Level
(0 to 255 dB)
measured level - reference level = rel-
ative level used in some functions
45
Currant Exchange
Rate 1
[3dB,4dB,5dB,6dB]
Exchange rate for currant TWA or
Dose readings. For OSHA use 5dB.
46
Current
Threshold 1
(0 to 255 dB)
Levels above threshold are integrated
into currant TWA or Dose readings.
For OSHA use 80 dB.
47
Currant
Criterion 1
(0 to 255 dB)
100% dose if this level is maintained
for full dose period. For OSHA use 90
dB.
48
Overall
Exchange Rate 2
[3dB,4dB,5dB,6dB]
Exchange rate for overall TWA or
Dose readings.
49
Overall
Threshold 2
(0 to 255 dB)
Levels above threshold are integrated
into overall TWA or Dose readings.
50
Overall
Criterion 2
(0 to 255 dB)
100% dose if this level is maintained
for full dose period.
