Keithley 2750 User Manual page 278

Model 2750 Multimeter/Switch System User's Manual
Limit 1 will be used to test for the 1% tolerance and Limit 2 will be used to test for the 5%
tolerance.
The resistance values for the 1% and 5% tolerances are calculated as follows:
The high and low limits are then calculated as follows:
The limits are illustrated in
Figure 9-7
Limits to sort 100Ω resistors (1%, 5%, and >5%)
No Beep
Front Panel Operation — For front panel operation, the INSIDE beeper mode must be
used. A normal pitch beep and the message IN indicates that the resistor is within the 1%
tolerance limit
message indicates that the resistor is >1% tolerance but <5% tolerance. This 5% resistor
belongs in Bin 2. For resistors >5%, no beep will sound. Place these resistors in Bin 3.
= 100Ω × 1%
R
1%
= 100Ω × 0.01
= 1Ω
HI Limit 1 = 100Ω + R
= 100Ω + 1Ω
= 101Ω
LO Limit 1 = 100Ω – R
= 100Ω – 1Ω
= 99Ω
Figure
Beep
(Low Pitch)
LOW
95Ω 99Ω
LO2 LO1
(Figure 9-7). This 1% resistor belongs in Bin 1. A raspy beep and the "1"
= 100Ω × 5%
R
5%
= 100Ω × 0.05
= 5Ω
HI Limit 2 = 100Ω + R
1%
LO Limit 2 = 100Ω – R
1%
9-7.
Beep
(Normal Pitch)
IN
100Ω
Limit 1 (1%)
Limit 2 (5%)
Limits and Digital I/O
5%
= 100Ω + 5Ω
= 105Ω
5%
= 100Ω – 5Ω
= 95Ω
Beep
No Beep
(Low Pitch)
HIGH
101Ω 105Ω
HI1 HI2
9-17