5-18 Model 2790 SourceMeter
®
Switch System User’s Manual
Contact checks
NOTE Low-resistance, 2-wire ohms measurement accuracy can be reduced by the
resistance of the protective fuses on the 7751/7752/7753 modules, which are in
series with the DMM current source output. See “Fuse resistance consider-
ations,” page 6-2 for more information.
Test circuits
The test circuits to verify contact are shown in Figure 5-9 (single stage inflator) and
Figure 5-10 (dual stage inflator). Contact is checked by performing a continuity check
through the V-source test leads and the connection points.
Single stage inflator — As shown in Figure 5-9, there are three contact connection points
for the V-source test circuit. Contact checks are performed as follows:
• Bank 1 HI contact — Close channels 1, 14, and 18 to check the connection at the
HI terminal of the bridgewire.
• Bank 2 housing contact — Close channels 8, 15, and 18 to check the connection at
the housing of the inflator.
Dual stage inflator — As shown in Figure 5-10, there are four contact connection points
for the V-source test circuits. Contact checks are performed as follows:
• Bank 1 HI contact — Close channels 1, 14, and 18 to check the connection at the
HI terminal of bridgewire A.
• Bank 2 housing contact — Close channels 8, 15, and 18 to check the connection at
the housing of the inflator.
• Bank 3 HI contact — Close channels 4, 14, and 18 to check the connection at the
HI terminal of bridgewire B.
To Next Page
Loading...
Need help?
General
