Wiring Procedure - Keithley 2790 User Manual

4-4

Wiring procedure

Use the following procedure to wire a 7751, 7752, 7753, or 7702 module. Make sure to
add supplementary insulation around the harness for voltages above 42V peak (see
Figure
NOTE
WARNING
WARNING
CAUTION
1.
2.
3.
4.
5.
6.
4-4).
Figure 4-2 and Figure 4-3
and 7702 modules. Figure 4-4
Wiring for the 7702 module is similar.
Do not connect 7751/7753 V-source Hi to earth ground. The 7751/7752/
7753 module uses a floating ground. This floating ground is not
connected to safety earth ground. Not only will it create a shock
hazard by floating up to 500V, it will also effectively connect a 1nF
capacitor across the V-source, providing energy storage that could
ignite an airbag under fault conditions.
All wiring and supplementary insulation must be rated for the maxi-
mum voltage in the system. For example, if 500V is being used in the
test system, the module wiring (for both slots) must be rated for at least
500V.
For the 7751/7753, be sure not to dislodge the thermal pad on the volt-
age source. Also be sure to use only the top cover with the integral heat
sink to assure proper voltage source operation.
Make sure all power is discharged from the switching module.
Access the screw terminals (see
Using a small flat-blade screwdriver, loosen terminal screws and install wires as
desired. Figure 4-4 shows 7751/7752/7753 connections to channels 1 and 2, and
the interlock.
Route wire along wire-path and secure with cable ties as shown. Note that the
wires leading out of the module should be encased in a ground wrap (see
"Zippertubing® shield").
Fill in a copy of the connection log
Table 3-1 for the 7702) and affix it to the module cover.
Close and lock cover.
Model 2790 SourceMeter
show channel identification for the 7751/7752/7753
shows how to wire a 7751/7752/7753 module.
Figure 4-1).
(Table 2-4 for the 7751/7752/7753, and
®
Switch System User's Manual