Keithley 2182 User Manual - Limit Operations

Limit operations

Limit operations set and control the values that determine the HI/IN/LO status of subsequent 

measurements. The limit test is performed on the result of an enabled Rel, mX+b, or Percent 

operation. 

There are two sets of limits. Limit 1 uses high and low limits (HI1 and LO1) as does Limit 2 

(HI2 and LO2). However, the HI/IN/LO status message only applies to Limit 1. 

Figure 8-1

illustrates the following limits which are the factory defaults: 

Limit 1: HI1 = +1V and LO1 = -1V

Limit 2: HI2 = +2V and LO2 = -2V 

Figure 8-1

Default limits

For the limits shown in 

Figure 8-1

, a reading of 1.5V is outside Limit 1 (which is the primary 

limit). Therefore, the message “HI” will be displayed. 

A beeper is also available for limit testing. There are three beeper options: NEVER, 

OUTSIDE and INSIDE. These options are explained as follows: 

NEVER — With this option, the beeper is disabled. Only the HI/IN/LO status message is 

used for the Limit 1 test. 

OUTSIDE — With this option, the beeper sounds when the reading is outside (HI or LO) of 

Limit 1. Again referring to 

Figure 8-1

, a 1.5V reading is outside (HI) Limit 1. Therefore the 

beeper will sound. 

INSIDE — With this option, the beeper sounds when the reading is inside Limit 1 and/or 

Limit 2. If the reading is inside Limit 1, the beeper will sound at its normal pitch. If the reading 

is outside Limit 1 but inside Limit 2, the beeper will sound at a lower pitch. The beeper will not 

sound for readings outside Limit 2. For the limits shown in 

Figure 8-1

, a 0.5V reading will sound 

the beeper at its normal pitch, a 1.5V reading will sound the beeper at a lower pitch, and for a 

2.5V reading, the beeper will not sound. 

NOTE

To use the Limit 2 test, the INSIDE beeper mode must be selected. With NEVER or 

OUTSIDE selected, Limit 2 is (in effect) disabled. 

-2V

LO2

-1V

LO1

+1V

HI1

+2V

HI2

LO

IN

HI

Limit 1

Limit 2

0

Limits

8-3