2-22
1. Turn on the Model 6517A, and allow the instrument to
warm up for at least one hour before performing
calibration.
2. Press in on the front panel CAL switch to unlock
calibration.
3. Press the MENU key. The instrument will display the
following menu:
MAIN MENU
SAVESETUP COMMUNICATION CAL
4. Select CAL, then press ENTER. If the optional Model
5156 Calibration Standard is connected to the DIGITAL
I/O port, the following prompt will be displayed:
USE CAL OPTION CARD?
YES NO
5. Select yes, then press ENTER.
6. The following menu will be displayed:
PERFORM CALIBRATION
COMPREHENSIVE POINT-CALS
7. Select POINT-CALS, then press ENTER. The Model
6517A will prompt you to select the function:
POINT-CALS
VOLTS AMPS CHARGE VSOURCE
EXT-TEMP HUMIDITY ZEROCHECK
8. Select VOLTS, then press ENTER. The unit will prompt
you to choose the range:
CHOOSE VOLTS RANGE
ALL 2V 20V 200V
9. Select the desired option, then press ENTER. If you
wish to calibrate all volts ranges, choose ALL; other-
wise, select the range to be calibrated, then press the
ENTER key.
10. Follow the prompts regarding the various calibration
steps, and refer to paragraph 2.8 for additional
information.
11. Repeat the above steps for other calibration points, if
desired.
12. If desired, select CAL-DATES in the calibration menu,
then set the calibration date and due date accordingly.
13. Press EXIT as necessary to return to normal display. If
you wish calibration to be permanent, select the save
option; valid calibration constants will be saved, and
calibration will be locked out.
2.10.2 IEEE-488 bus single-point calibration
To perform IEEE-488 bus single-point calibration, simply
connect the appropriate signal, then send the corresponding
calibration commands. Keep in mind that all commands for
a given range or function must be sent in order to completely
calibrate that range or function. (See paragraph 2.9 for more
information on commands and procedures.)
Remember that you must unlock calibration first. Also, it is
strongly recommended that you perform voltage offset, bias
current, and zero check calibration before calibrating a volts,
amps, or coulombs range or function.
Before sending any calibration commands, you must send
the “:CAL:PROT:INIT” command to initialize calibration.
After calibrating the desired point(s), you must then save the
new calibration constants by sending the
“:CAL:PROT:SAVE” command over the bus. You can then
lock out calibration by sending “:CAL:PROT:LOCK”.
Example
As an example, assume that you intend to calibrate the 20V
range of the volts function. The basic steps are summarized
below:
1. Turn on the Model 6517A power and allow the instru-
ment to warm up for at least one hour before performing
calibration.
2. Press the front panel CAL switch to unlock calibration.
3. Send the following command over the bus to initiate
calibration:
:CAL:PROT:INIT
4. Perform voltage offset, bias current, and zero check cal-
ibration as outlined in Step 2 of the IEEE-488 bus cali-
bration procedure in paragraph 2.9.2.
5. Connect the DC voltage calibrator to the INPUT jack
(see Figure 2-2).
6. Set the output voltage of the DC calibrator to
0.000000V, then send the following command:
:CAL:PROT:VZERO20
7. Set the output voltage of the DC calibrator to
+19.00000V, then send the following command:
:CAL:PROT:V20 19
8. Set the output voltage of the DC calibrator to -19.00000V,
then send the following command:
:CAL:PROT:VN20 -19
9. Repeat steps 6 through 8 as desired for other calibration
points.
10. If desired, send the following commands to program the
calibration date and calibration due date:
:CAL:PROT:DATE <yr>,<mon>,<date>
:CAL:PROT:NDUE <yr>,<mon>,<date>