Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual Calibration Reference B-19
Calibration Reference
:LOCK?
(:CALibration:PROTected:CARD1:LOCK?)
Purpose To read Model 7700 calibration lock status.
Format :cal:prot:card1:lock?
Response 0 Calibration locked.
1 Calibration unlocked.
Description The :LOCK? query requests status from the Model 2750 on Model
7700 calibration locked/unlocked state. Calibration must be enabled
sending the :CODE command before calibration can be performed.
Example :CAL:PROT:CARD1:LOCK? Request card 1 cal lock state.
:RCOunt
(:CALibration:PROTected:CARD1:RCOunt)
Purpose To reset card calibration count to 0.
Format :cal:prot:card1:rco
Parameters None
Description The :RCOunt command resets the card calibration count reported by
:COUNt? to 0.
Example :CAL:PROT:CARD1:RCO Rest card calibration count.
:REFTEMP?
(:CALibration:PROTected:CARD:REFTEMP? <NRf>)
Purpose To request the Model 7700 reference calibration temperature.
Format :cal:prot:card:reftemp? <NRf> (<NRf> = 1 to 5)
Response <ground_voltage>,<ref_temp>
Description The CARD:REFTEMP? query allows you to read back the ground volt-
age and calibration reference temperature from a Model 7700 in Slot 1
through Slot 5 respectively (<NRf> = 1 to 5). The two response values
are delimited by a comma.
Example :CAL:PROT:CARD:REFTEMP? 1 Request card 1 temp.

Keithley 2750 Specifications

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