Table 18-7 Coulombs Measurement Accuracy Reading Limits - Keithley 6514 Instruction Manual

7.
Table 18-7
Coulombs measurement accuracy reading limits
Nominal
Model calibrator
6514 range voltage
20nC 20V
200nC 200V
2µC 20V
20µC 200V
1
Nominal values.
2
Calculate actual voltage from applied charge and actual capacitance value: V = Q/C.
Verify charge measurement accuracy for each of the values listed in Table 18-7. For each
test point:
• Select the correct Model 6514 measurement range.
• Make connections to the correct standard capacitor.
• Calculate the required voltage from the desired charge and actual standard capaci-
tance value: V = Q/C.
• Disable zero check.
• Set the calibrator voltage to the calculated value.
• Verify that Model 6514 charge reading is within the required limits.
• Enable zero check to discharge the capacitor.
Standard
1
capacitor Applied charge
1nF 20.0000nC
1nF 200.000nC
100nF 2.00000µC
100nF 20.0000µC
Performance Verification
Actual Model 6514 coulombs reading
2
voltage limits (1 Year, 18˚C-28˚C)
_______V 19.9915 to 20.0805nC
_______V 199.195 to 200.805nC
_______V 1.97995 to 202.02005µC
_______V 19.7995 to 20.2005µC
18-19