DIAGNOSTICS
Test Points and LEDs
10DEC05
DG4825-1
Page
174 of 180
9
5 V DC_I
Int5 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
12 V DC POWER
SUPPLY
11.5 - 12.5 V DC
19
5 V DC_A
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_B2.5 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
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