2-19
Step 6: Coulombs Calibration
Perform the steps below to calibrate the coulombs function
over the bus. Table 2-13 summarizes the necessary steps.
1. Connect the calibration standard and DC voltage cali-
brator to the Model 6517A INPUT jack (see Figure 2-5).
Initially, make connections to the 1nF capacitor in the
standards box.
2. Set the output voltage of the DC calibrator to 0.00000V.
3. Send the following command over the bus:
:CAL:PROT:CZEROA2N
4. Set the calibrator output voltage to +1.900000V, then
send the following command over the bus:
:CAL:PROT:C2NCARD 1.9
5. Set the calibrator output voltage to 0.000000V, then
send the following command:
:CAL:PROT:CZEROB2N
Table 2-13
IEEE-488 bus coulombs calibration summary
Calibration
voltage
Standard
1
capacitance
Nominal
2
charge
Calibration command
0.000000V
1.900000V
0.000000V
-1.900000V
0.000000V
19.00000V
0.000000V
-19.00000V
0.000000V
1.900000V
0.000000V
-1.900000V
0.000000V
19.00000V
0.000000V
-19.00000V
1nF
1nF
1nF
1nF
1nF
1nF
1nF
1nF
100nF
100nF
100nF
100nF
100nF
100nF
100nF
100nF
0nC
1.9nC
0nC
-1.9nC
0nC
19nC
0nC
-19nC
0nC
190nC
0nC
-190nC
0µC
1.9µC
0µC
-1.9µC
:CAL:PROT:CZEROA2N
:CAL:PROT:C2NCARD 1.9
:CAL:PROT:CZEROB2N
:CAL:PROT:CN2NCARD -1.9
:CAL:PROT:CZEROA20N
:CAL:PROT:C20NCARD 19
:CAL:PROT:CZEROB20N
:CAL:PROT:CN20NCARD -19
:CAL:PROT:CZEROA200N
:CAL:PROT:C200NCARD 1.9
:CAL:PROT:CZEROB200N
:CAL:PROT:CN200NCARD -1.9
:CAL:PROT:CZEROA2U
:CAL:PROT:C2UCARD 19
:CAL:PROT:CZEROB2U
100nF :CAL:PROT:CN2UCARD -19
1
Nominal capacitance standard shown. Refer to calibration data for actual value.
2
Charge calculated from: Q = CV, where C is capacitance standard value, and V is the calibrator voltage. When using the
Model 5156 Electrometer Calibration Standard, the Model 6517A automatically computes the charge from the applied
voltage and the actual capacitance value.
6. Set the calibrator output voltage to -1.900000V, then
send:
:CAL:PROT:CN2NCARD -1.9
7. Repeat steps 3 to 6 for the remaining coulombs calibra-
tion steps summarized in Table 2-13.
Step 7: Temperature Calibration
Follow the steps below to calibrate the Model 6517A tem-
perature function.
1. Connect the thermocouple calibrator to the Model
6517A EXT TEMP jack (see Figure 2-6).
2. Set the thermocouple calibrator output to 0°C, then send
the following command:
:CAL:PROT:TZERO
3. Set the thermocouple calibrator output to 100°C, then
send the following command:
:CAL:PROT:T100