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2-14 Calibration Model 2701 Service Manual

Short and open calibration

1. Connect the Model 8610 low-thermal short to the instrument INPUT and SENSE

terminals 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 2701 completes this step, remove the low-thermal short and then send

this command:

:CAL:PROT:DC:STEP2

NOTE Be sure to minimize movement near front Input terminals. Excessive movements can

cause capacitive coupling errors, which could affect calibration accuracy.

DC voltage calibration

After the front panel short and open steps, perform the following:

1. Connect the calibrator to the Model 2701 as shown in Figure 2-2. Allow three minutes

for thermal equilibrium.

NOTE Although 4-wire connections are shown, the sense leads are connected and discon-

nected at various points in this procedure by turning calibrator external sense on or

off as appropriate. If your calibrator does not have provisions for turning external

sense on and off, disconnect the sense leads when external sensing is to be turned off

and connect the sense leads when external sensing is to be turned on.

2. Perform the calibration steps summarized in Table 2-8. For each step:

• Set the calibrator to the indicated voltage and make sure the unit is in operate. (Use

the recommended voltage if possible.)

• Send the indicated programming command. (Change the voltage parameter if you

are using a different calibration voltage.)

•Wait until the Model 2701 completes each step before continuing.

Keithley 2701 Service Manual

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