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Performance Verification
5.5.6 Input impedance verification
Perform this test to verify that the input impedance of the
Model 6512 is greater than 200T Ω :
1. Connect the DC calibrator, Model 263, and the Model
6512 together as shown in Figure 5-4.
2. Place the Model 6512 in the volts function, select the
20V range, and enable ZERO CHECK. Verify that the
display shows 0.000V ±1 count. If not, enable ZERO
CORRECT.
3. Enable GUARD on both the Models 6512 and 263.
4. On the Model 263, select the 200G Ω range, and press
ZERO to source zero ohms. Make sure the Model 263 is
in OPERATE.
5. Set the DC calibrator to output 19.000V.
6. On the Model 6512, disable ZERO CHECK, and note
the reading.
7. Enable ZERO CHECK on the Model 6512, and press
ZERO on the Model 263 to select the 100G Ω resistor.
8. Disable ZERO CHECK on the Model 6512. After wait-
ing a few seconds for settling, note the 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
(10mV) of one another.
BANANA CABLE
Figure 5-4
Connections for input impedance verification
5-8
SHORTING LINK
COMMON
DISCONNECTED
OUTPUT
MODEL 263
(GUARD ON)
TR
DC
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