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Model 6485 Picoammeter Instruction Manual Remote Calibration H-3

Remote calibration overview

The steps below outline the general procedure for calibrating the Model 6485 using

remote commands. Refer to “Section 16” for details on calibration steps, calibration

points, and test equipment connections.

1. Send the following command to unlock calibration:

:CAL:PROT:CODE 'KI006485'

Note that the above command uses the factory default code.

2. Perform voltage offset correction by sending the following command:

:CAL:UNPR:VOFF

Be sure a BNC shielding cap is connected to the INPUT jack before sending the

above command.

3. Send the appropriate command to select the range to be calibrated. For example,

the following command selects the 20mA range:

:SENS:CURR:RANG 2e-2

4. Make appropriate connections, then send the commands for each calibration point

for the selected function and range. For example, send the following commands for

the 20mA range:

:CAL:PROT:SENS 0

:CAL:PROT:SENS 2e-2

:CAL:PROT:SENS –2e-2

NOTE Be sure the appropriate calibration signal is applied to the INPUT jack before

sending the command for each calibration point. See “Section 16” for details.

5. Repeat steps 3 and 4 for each range (Table H-2).

6. After all ranges are calibrated, send the commands to program the calibration

dates; for example:

:CAL:PROT:DATE 2001,12,15

:CAL:PROT:NDUE 2002,12,15

7. Finally, send the following commands to save calibration constants and then lock

out calibration:

:CAL:PROT:SAVE

:CAL:PROT:LOCK

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