Michell Instruments S904, Руководство пользователя

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S904 & S904D User’s Manual
Michell Instruments 19
OPERATION
14.5 V Supply - PIN 25
This pin is connected to the internal power supply of the S904D and can be used to
provide power to probes inside the chamber.
NOTE: For safety purposes the power supply is fi tted with a thermal cut-out
that is connected to the rear panel 25-pin connector only. It is important that
this thermal cut-out is not bypassed, or the instrument may be damaged in
the event of a fault. Refer to Figures 21 and 22 for detailed drawings showing
how to correctly wire the power supply.
Ground - PIN 21
This pin is connected to the ground of the internal power supply.
Reserved – Do not use - PINS 10, 11, 12, 13, 23, 24
DANGER
Electric
Shock Risk
Warning
Applying a current or voltage to the Reserved PINS may cause
permanent, irreversible damage to the S904D electronics.
3.7.2 S904D Example Wiring Diagrams
The following diagram shows how to connect three %RH probes using the 25-pin D-sub
connector inside the chamber, and powering the probes using the internal S904D power
supply while logging their %RH and temperature outputs.
1
2
3
4
5
6
7
8
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
POWER
U-CONTROLLER
CHANNEL 7
CHANNEL 8
CHANNEL 6
CHANNEL 5
CHANNEL 4
CHANNEL 3
CHANNEL 1
CHANNEL 2
25P. D-sub FEMALE
MEASURING CHAMBER
INTERNAL S904
25P. D-sub MALE
PCB S-576
25P. D-sub FEMALE
PCB S-676 Back Panel
RESERVED
DO NOT USE
PTC
1
2
3
4
5
6
7
8
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
1
2
3
4
5
6
7
8
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
INPUT OUTPUT
V+
GND
OUT-T
OUT-RH
V+
GND
OUT-T
OUT-RH
V+
GND
OUT-T
OUT-RH
Figure 21 S904D Wiring Diagram Example 1