990 CLD Autoline™ Leak Detector
3-14
DRAFT 2/2/04
Gain-Selective Amplifier
The gain-selective amplifier on the I/O Control Board (PN L9057) facilitates the interfacing
of external sensors to the
Leak Rate
output terminals located on the Controller rear panel.
Set the gain at the jumper strip (J1) to coincide with the desired leak rate decade and to
ensure an analog output of 0 to 10 VDC at the rear panel connector. This output is directly
proportional to the leak rate being measured and will not exceed
−
200 mV and +10.7 VDC.
The new I/O board includes a jumper strip (J1) with two interchangeable shorting plugs.
To set the gain:
❑
Use tweezers or needle-nosed pliers to configure the shorting plugs as per Table 3-4
and Figure 3-1.
Figure 3-1
Setting the Gain via Shorting Plugs
Table 3-4
Shorting Plug and Leak Rate Outputs
Leak Rate Decade
Shorting Plug
Shorting Plug
Leak Rate Output
10
−
5
std cc/sec (factory-set)
A
1
0 to 10 V (setting for log scale)
10
−
6
std cc/sec
A
2
0 to 10 V
10
−
7
std cc/sec
A
3
0 to 10 V
10
−
8
std cc/sec
B
4
0 to 1 OV
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