18 Quick Reference Guide
Programming example
The programming example in Table 10 tests limits on a voltage input to Channel 1. Limit
1 values are ±0.1, and Limit 2 values are ±1.
Math operations
Model 2182 math operations include ratio, delta, mX + b, and percent.
Ratio
Ratio (V1/V2) displays the proportional relationship between the two voltage input
channels (DCV1 and DCV2). Ratio is calculated as follows:
Ratio = V1/V2
where: V1 is the voltage reading for Channel 1 (DCV1)
V2 is the voltage reading for Channel 2 (DCV2)
Ratio is selected by pressing the V1/V2 key. The “CH1 / CH2” message appears briefly
before displaying the result of the calculation. The “RA” message is displayed while in
Ratio. Ratio is disabled by selecting a single measurement function (DCV1, DCV2,
TEMP1, or TEMP2) or by selecting Delta.
Delta
Delta provides the measurements and calculation for the DC current-reversal technique to
cancel the effects of thermal EMFs in the test leads. Each Delta reading is calculated from
two voltage measurements on Channel 1: one on the positive phase of an alternating
current source, and one on the negative phase.
Table 10
Command sequence for limit test example
Command
1
Comments
*RST Restore GPIB defaults.
:CALC3:LIM:LOW -0.1 Set Limit 1 lower limit to -0.1.
:CALC3:LIM:UPP 0.1 Set Limit 1 upper limit to 0.1.
:CALC3:LIM:STAT ON Enable Limit 1 test.
:CALC3:LIM2:LOW -1 Set Limit 2 lower limit to -1.
:CALC3:LIM2:UPP 1 Set Limit 2 upper limit to 1.
:CALC3:LIM2:STAT ON Enable Limit 2 test.
:READ? Trigger and request a reading.
1
:CALC3:LIM:FAIL? Request Limit 1 test result.
1
:CALC3:LIM2:FAIL? Request Limit 2 test result.
1
1. Model 2182 must be addressed to talk after sending :READ?,
:CALC3:LIM:FAIL?, and :CALC3:LIM2:FAIL? to acquire test result.
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