DIAGNOSTICS Test Points and LEDs
10DEC05
DG4825-1
Page
174 of 180
9 5 V DC_I Interface +5 V DC POWER
SUPPLY
5 V DC within the tolerance of the
REGULATOR on the DIGITIZER
BOARD A3
10 DGND Digital ground 0.0 V DC
11 IGND Interface ground 0.0 V DC
12 PMT_HV_CTL High voltage power supply
control system for the PMT
0.0 - 8.9 V DC
13 PMT_HV High voltage for the PMT 0 - 630 V DC
14 AGND Analog ground 0.0 V DC
15 AGND Analog ground 0.0 V DC
16 –5 V DC_A Analog –5 V DC POWER
SUPPLY
–4.9 - –5.1 V DC
17 –12 V DC_A Analog –12 V DC POWER
SUPPLY
–11.75 - –12.21 V DC
18 12 V DC_A Analog +12 V DC POWER
SUPPLY
11.5 - 12.5 V DC
19 5 V DC_A Analog +5 V DC POWER
SUPPLY
4.8 - 5.2 V DC
20 PMT_1 Signal from PMT 1 0 - 12 V DC in ratio to light and
voltage on the PMT
21 2.5 V_BUF_REF +2.5 V DC reference 2.48 - 2.52 V DC
22 NOM_8.9 V –8.9 V DC reference –8.8 - –9.0 V DC
23 PMT_2 Signal from PMT 2 0 - 12 V DC in ratio to the light
and voltage on the PMT
24 AGND Analog ground 0.0 V DC
25 PIX_A_1 Pixel signal + 0 - +2.5 V DC from low light to full
light on the PMTS
26 PIX_A_2 Pixel signal - 2.5 - 0 V DC from low light to full
light on the PMTS
TP Name Description Expected Signal
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