Preparing The Model 2015 For Calibration; Short And Open Calibration - Keithley 2015 Service Manual

Preparing the Model 2015 for calibration

1. Connect the Model 2015 to the IEEE-488 bus of the computer using a shielded
IEEE-488 cable, such as the Keithley Model 7007, or connect the unit to a computer
through the RS-232 port using a straight-through 9-pin to 9-pin cable (use a 9-25-pin
adapter if necessary).
2. Turn on the Model 2015, and allow it to warm up for an hour before performing
calibration.
3. Select the DCV function, and choose SLOW as the rate (integration time = 10PLC).
4. Make sure the primary address of the Model 2015 is the same as the address specified in
the program that you will be using to send commands. (Use the GPIB key.)
5. Unlock the calibration function by sending this command:
:CAL:PROT:CODE 'KI002015'
(The above command shows the default code, KI002015. Substitute the correct code if
changed.)
6. Send the following command to initiate calibration:
:CAL:PROT:INIT

Short and open calibration

1. Connect the Model 8610 low-thermal short to the instrument INPUT and SENSE termi-
nals as shown in Figure 2-1. Make sure the INPUTS button is not pressed in so that the
front inputs are active. Wait at least three minutes before proceeding to allow for thermal
equilibrium.
NOTE Be sure to connect the low-thermal short properly to the HI, LO, and SENSE termi-
nals. Keep drafts away from low-thermal connections to avoid thermal drift, which
could affect calibration accuracy.
2. Send the following command:
:CAL:PROT:DC:STEP1
3. After the Model 2015 completes this step, remove the low-thermal short, and send this
command:
:CAL:PROT:DC:STEP2
Calibration 2-17