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20 Quick Reference Guide

Programming example

The command sequence in Table 12 enables Ratio and displays the result on the computer

CRT.

mX+b

This math operation manipulates normal display readings (X) mathematically according

to the following calculation:

Y = mX+b

where: X is the normal display reading

m and b are user-entered constants for scale factor and offset

Y is the displayed result

To conﬁgure and enable mX + b, press SHIFT and then MX+B to display the present scale

factor. Enter the desired M, B, and UNITS values at the prompts, and press ENTER. The

MATH annunciator will turn on to indicate that mX+b is enabled. Press SHIFT then

MX+B again to disable the function. The MATH annunciator will turn off.

Percent (%)

This math function determines percent deviation from a speciﬁed reference value. The

percent calculation is performed as follows:

Input – Reference

Percent = ––––––––––––––––– × 100%

Reference

where: Input is the normal display reading

Reference is the user entered constant

Percent is the displayed result

To conﬁgure and enable the percent function, press SHIFT then %. Enter the desired REF

value, then press ENTER. The MATH annunciator will turn on to indicate that percent is

enabled. Press SHIFT then % again to disable the function. The MATH annunciator will

turn off.

Table 12

Command sequence for ratio measurement example

Command* Comments

:SENS:FUNC ‘VOLT’ Select voltage function.

:SENS:CHAN 1 Select channel 1 for range control.

:SENS:VOLT:RATIO ON Enable ratio function.

:READ? Trigger and request reading.

*Model 2182 must be addressed to talk after sending :READ? to acquire reading.

Keithley 2182 Quick Reference Guide

Other manuals for Keithley 2182