Voltage Source Verification
Use the following procedure to verify that the Model 617
voltage source is within tolerance:
WARNING
Dangerous voltage may be present on the
voltage source output terminals when the
voltage source output is enabled.
1. Connect the DMM to the voltage source output ter-
minals, as shown in Figure 4.
2. Select an appropriate DCV range on the DMM. Alter-
nately, place the DMM in the autorange mode, if
desired.
3. Press the DISPLAY button to view the voltage source
value and turn on its output by pressing the OPERATE
button.
4. Using the ADJUST buttons, set the voltage source out-
uut to oo.oov.
5. Verify that the voltage source value is within the limits
stated in Table 4.
6. Repeat steps 4 and 5 above with the remaining voltages
listed in the table.
7. Repeat the procedure for negative voltages of the same
amplitude listed in the table.
Input Impedance Verification
Perform this test to verify that the input impedance of the
unit is greater than 2OUlQ
1. Connect the DC calibrator, Model 263 and the Model
617 as shown in Figure 5.
2. Place the Model 617 in the volts function, select the 20V
range, and enable ZERO CHECK. Verify that the display
shows O.OOOV +1 count. If not, enable ZERO CORRECT,
3. Enable GUARD on both the Models 617 and 263.
4. On the Model 263, select the 200GQ range, and press
ZERO to source zero ohms. Make sure the Model 263
is in OPEm.
5. Set the DC calibrator to output 19.OOOV.
6. On the Model 617, disable ZERO CHECK and note the
reading.
7. Enable ZERO CHECK on the Model 617, and press
ZERO on the Model 263 to select the lOOGO resistor.
8. Disable ZERO CHECK on the Model 617. After waiting
a few seconds for settling, note reading on the Model
263.
9. Compare the reading obtained in step 8 with that noted
in step 6. The two readings should be within 10 counts
(1OmV) of one another.
Table 4. Voltage Source Verification Limits
-l
Programmed
Voltage
Allowable DMM Reading
(WC -28’C)
I
oo.oov - 0.050 to
+ 0.05OV
01.0ov 0.945 to 1.052V
lO.OOV 9.93 to 10.07 v
25.OOV
24.90 to 25.10
v
5o.oOV
49.85 to 50.15
v
lOO.OOV
99.75 to 100.25
v
A-6
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