Keithley 2750 Service Manual (English)

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B-26 Calibration Reference Model 2750 Multimeter/Switch System Service Manual

Using the *OPC command

The *OPC (operation complete) command can also be used to detect the completion of

each calibration step. To use *OPC to detect the end of each calibration step, you must do

the following:

1. Enable operation complete by sending *ESE 1. This command sets the OPC (oper-

ation complete bit) in the standard event enable register, allowing operation com-

plete status from the standard event status register to set the ESB (event summary

bit) in the status byte when operation complete is detected.

2. Send the *OPC command immediately following each calibration command. For

example:

:CAL:PROT:DC:STEP1;*OPC

3. Note that you must include the semicolon (;) to separate the two commands, and

that the *OPC command must appear on the same line as the calibration command.

4. After sending a calibration command, repeatedly test the ESB (Event Summary)

bit (bit 5) in the status byte until it is set. (Use either the *STB? query or serial poll-

ing to request the status byte.)

5. Once operation complete has been detected, clear OPC status using one of two

methods: (1) Use the *ESR? query, then read the response to clear the standard

event status register, or (2) send the *CLS command to clear the status registers.

Note that sending *CLS will also clear the error queue and operation complete

status.

Generating an SRQ on calibration complete

An IEEE-488 bus SRQ (service request) can be used to detect operation complete instead

of repeatedly polling the Model 2750. To use this method, send both *ESE 1 and *SRE 32

to the instrument, then include the *OPC command at the end of each calibration com-

mand line, as covered above. Refer to your controller’s documentation for information on

detecting and servicing SRQs.

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General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A