Dorrough 12-A, double meters in a dual rack
Two Model 12-A's mount into a standard rack adapter for a total of four metering channels. Small curved dual channel with 14dB of headroom.
Specifications
Input Parameters
Input Z : 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
CMRR : 80 dB at 60 Hz, 60 dB at 20 kHz (balanced mode)
Input Sensitivity : -10 dB for full-scale display
Maximum Input Level : +24 dB before clipping
Signal Path Parameters
Signal Path Bandwidth : 10 Hz - 25 kHz, +/- .25 dB
Signal Path Distortion : Less than 1% THD at 1 kHz, +24 dB input
Sum Error : Less than 0.1 dB at 1 kHz
Difference Error : Less than 0.1 dB at 1 kHz
Display Parameters (All parameters apply to AVERAGE, PEAK, and PEAK HOLD display elements.)
Display Resolution : 40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB.
Step Size Error : +/- 0.25 dB
Absolute Error :
- Full Scale -39 dBu : +/- 0.25 dB model A,B,C
- Full Scale -59 dBu : +/- 0.25 dB model D
Drift : +/- 0.25 dB
Average Time Constant : 600 mS, +/- 6%
Peak Acquistion Period : 10 uS, to full-scale, sine input 25kHz
Peak Attack Period : Virtually Instantaneous
Peak Decay Period : 180 mS, from full-scale to all LEDs off (models A, B, C)
Display Update Rate : Approximately 10 mS
Display Duty Cycle : Display Time, AVERAGE, PEAK HOLD - 75%
Display Time, PEAK - 100%
Miscellaneous Parameters
Power Supply Input Range : 117/237 VAC RMS, -20% to +10%, 50-60 Hz
Calibration Controls : None needed
User Controls :
Left/Right input sensitivity
Option DIP Switch
A) Peak Auto [ON]
B) Difference Mode [ON/OFF]
C) Over Level Alarm [ENABLE]
D) Under Level Alarm [ENABLE]
E) Auto ARMP
User Port :
DB-9 Connector
A) Alarm relay closure contacts 1 form C, 1A, 30V AC or DC
B) Mode control switch (user supplied)
C) PEAK function switch (user supplied)
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