18-14 Performance Verification
Mainframe current measurement accuracy
Follow the steps below to verify that Model 6430 mainframe current measurement accuracy
is within specified limits. The procedure involves applying accurate currents from the Model
6430 current source and then verifying that Model 6430 current measurements are within
required limits.
1. With the power off, connect the digital multimeter to the Model 6430 INPUT/OUTPUT
jacks as shown in Figure 18-3. (Connect Model 6430 INPUT/OUTPUT HI to DMM
AMPS input; INPUT/OUTPUT LO to INPUT LO.)
2. Select the multimeter DC current function.
3. Set the Model 6430 to both source and measure current by pressing the SOURCE I and
MEAS I keys, and make sure the source output is turned on.
4. Verify measure current accuracy for the currents listed in Table 18-6. For each
measurement:
• Select the correct source range.
• Set the Model 6430 source output to the correct value as measured by the digital
multimeter.
• Verify that the Model 6430 current reading is within the limits given in the table.
NOTE It may not be possible to set the current source to the specified value. Use the closest
possible setting, and modify reading limits accordingly.
5. Repeat the procedure for negative calibrator currents with the same magnitudes as those
listed in Table 18-6.
Table 18-6
Mainframe current measurement accuracy limits
Model 6430 source
and measure range
1
Source current
2
Model 6430 current reading limits
(1 year, 18°-28°C)
1µA
10µA
100µA
1mA
10mA
100mA
1.000000µA
10.00000µA
100.000µA
1.00000mA
10.0000mA
100.000mA
0.99920 to 1.00080µA
9.9930 to 10.0070µA
99.969 to 100.031µA
0.99967 to 1.00033mA
9.9959 to 10.0041mA
99.939 to 100.061mA
1
Measure range coupled to source range when simultaneously sourcing and measuring current.
2
As measured by precision digital multimeter.
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