Keithley 2750 User Manual

3-46 Basic DMM Operation Model 2750 Multimeter/Switch System User’s Manual
e. TEMPerature:FRTD:RZERo <NRf> [, <clist>]
TEMPerature:FRTD:ALPHa <NRf> [, <clist>]
TEMPerature:FRTD:BETA <NRf> [, <clist>]
TEMPerature:FRTD:DELTa <NRf> [, <clist>]
These commands are used to set the parameters for the USER RTD type. Note
that the RZERo command sets the “Ω at 0°C” parameter. When any of these
commands are sent, the USER RTD type is automatically selected.
f. FREQuency:THReshold:VOLTage:RANGe <n> [, <clist>]
PERiod:THReshold:VOLTage:RANGe <n> [, <clist>]
These commands are used to specify the expected input level. The instrument
will then automatically select the most sensitive current or voltage threshold
range.
g. FREQuency:APERture <NRf> [, <clist>]
PERiod:APERture <NRf> [, <clist>]
The rate annunciators indicate the following aperture settings:
SLOW = 1 sec
MED = 0.1 sec
FAST = 0.01 sec
For all other aperture times, the rate annunciators are turned off.
h. UNIT:TEMPerature <name>
To set temperature measurement units to °C, use the C or CEL parameter. For
°F, use the F or FAR parameter. For Kelvin, use the K parameter.
i. Trigger and retrieve readings:
NOTE Detailed information on the processes to trigger and retrieve read-
ings is provided in Section 8, Section 13, and Appendix D.
INITiate:CONTinuous <b>
INITiate
With continuous initiation disabled (INITiate:CONTinuous OFF), you can use
the INITiate command to trigger one or more measurements.
NOTE Note that sending INITiate while the instrument is performing mea-
surements will cause error -213 (init ignored).
DATA[:LATest]?
DATA:FRESh?
These commands do not trigger a reading. They simply return the last reading
string. The reading reflects what is applied to the input.
While the instrument is performing measurements, you can use these com-
mands to return the last reading. If the instrument is not performing measure-
ments, DATA[:LATest]? will keep returning the same reading string.
2750-900-01.book Page 46 Wednesday, August 3, 2011 7:56 AM

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