Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 2700 2000_2700_speed

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Tech Note : A speed comparison of the Model 2000 and Model 2700

The purpose of this tech note is to highlight the suitability of the model 2700 for DMM applications
for which the model 2000 is typically used.

Both the Model 2000 and 2700 happen to have the same measurement engine. In almost every
DMM selection process where switching is not required, one tends to think of a model 2000. But
in circumstances where speed is a concern, the model 2700 should be considered as well as the
2000.

The data sheet specifications for both of these products indicate 5 readings/second at 10 NPLC
in VDC mode (Auto Zero OFF) at 6.5 digits of resolution.

A benchmark was performed at 5 NPLC but with Auto Zero and filtering enabled. Both the Model
2000 and 2700 were configured as follows using LabVIEW 6i with GPIB Read/Write VIs to send
SCPI commands. Both DCV and 2-wire Ohms functions were tested.

             Configuration           2000                   2700
                                     GPIB                   GPIB

             Function                DCV / Ohms(2w)         DCV / Ohms(2w)
             Digits                  6.5                    6.5
             PLC / Rate              5                      5
             Filter Type             Repeat                 Repeat
             Filter Count            10                     10
             Range                   Auto                   Auto
             Auto Zero Status        ON                     ON



             Reading Rate            1 reading/ 3.5 Sec     1 reading / 1.1Sec
             (reading/secs)



This configuration used ASCII data transfer (rather than binary) with the `READ?' command to
trigger and fetch data from the instruments.

The test results show the Model 2700 to be 3 times faster than the Model 2000. An additional test
was performed with the Filter turned off. The model 2700 was again three times faster than the
2000 (110msec vs. 350msec to measure and transfer the data over the GPIB bus).

For applications that requires throughput without sacrificing accuracy, the model 2700 should be
considered.

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