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5790A
Service Manual
Whenever EXT Guard is activated (the green indicator on the EX GRD key
is on), you must refresh the guard status after the instrument changes from
the 220V range to any higher range. To refresh, push the EX GRD key two
times (once to turn the indicator off, and once to turn the indicator on). If
using the remote interface, send the commands EXTGUARD OFF, and
followed by EXTGUARD ON.
If the 845A( ) is not grounded through the power cord, a connection must
be made to the 5440B ground as shown.
3-10
7. Connect the equipment as shown in Figure 3-3.
5440B
720A
Figure 3-3. DC Source Characterization Setup, Part 2
8. Set the 752A to OPERATE, MODE to 1000 V. Set the 720A dials to 1.0000000.
Set the 845A( ) to the 10 mV range.
9. Set the 5700A to 1000 V, OPERATE. Set the 845A( ) to OPR. Reduce the
845A( ) range switch setting until the largest on-scale reading is obtained. Adjust
the 5700A for a null. Repeat this procedure until you obtain a null of 1 V. Set
the 845A( ) OPR/ZERO to ZERO and set the 5700A to STANDBY. Record the
5700A Error Display indication in Table 3-2 under the column "5700A ERROR
DISPLAY INDICATION TO OBTAIN CHARACTERIZED NOMINAL
OUTPUT," opposite
10. Set the 720A dials to 0.6000000. Set the 5700A to 600 V, OPERATE. Set the
845A( ) to the 10 mV range. Repeat the nulling procedure of step 9, recording the
5700A Error Display indication opposite +600 V in Table 3-2. Set the 5700A to
STANDBY.
11. Set the 720A dials to 0.2000000. Set the 5700A to 200 V, OPERATE. Set the
845A( ) to the 10 mV range. Repeat the nulling procedure of step 9, recording the
5700A Error Display indication opposite +200 V in Table 3-2. Set the 5700A to
STANDBY.
845A ( )
Note
1000 V.
5700A
752A
elu018.eps
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