Instruction manual

NGA 2000 MLT Hardware
TEST PROCEDURE / TEST POINTS
11 - 4
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
11.1.5 Signal Processing on PCB “PSV”
Test point: P21.2 (“+”) and P21.3 “ ” of PCB “PIC” (Fig. 1-32)
Measuring instrument: Oscilloscope (signal form see 11.1.4)
Signal: Unamplified Measuring Signal from Detector (Measuring Channel 1)
(max. 4 V
PP
/ min. 1 V
PP
)
green LED of PCB “PSV” must be blinking with approx. 15 Hz
Failure: No signal / incorrect values
green LED is out / on permanent
Possible reason: Detector signal (channel 1) failure (Item 11.1.4)
Voltage supply absent (Item 11.1.1)
Source failure (Item 11.1.2) / Chopper failure (Item 11.1.3)
PCB “PIC” not correctly connected to PCB “ICB” or “ADS” / defective
PCB “PSV” not correctly connected to PCB “ICB” or “ADS”/ defective
SIGNAL PROCESSING ON PCB “PSV”