2400-902-01 (G - Feb 2006)
Model 2400 Service Manual 1-4
Performance Verification
Example limits calculation
As an example of how verification limits are calculated, assume you are testing the 20V DC
output range using a 20V output value. Using the Model 2400 one-year accuracy specification
for 20V DC output of ±(0.02% of output + 2.4mV offset), the calculated output limits are:
Output limits = 20V ± [(20V × 0.02%) + 2.4mV]
Output limits = 20V ± (0.004 + 0.0024)
Output limits = 20V ± 0.0064V
Output limits = 19.9936V to 20.0064V
Resistance limits calculation
When verifying the ohms function, you may find it necessary to recalculate resistance limits
based on the actual calibrator resistance values. You can calculate resistance reading limits in
the same manner described above, but be sure to use the actual calibrator resistance values and
the Model 2400 normal accuracy specifications for your calculations.
As an example, assume that you are testing the 20kΩ range, and the actual value of the nominal
19kΩ calibrator resistor is 19.025kΩ. Using the Model 2400 one-year normal accuracy
specifications of ±(0.06% of reading + 3Ω), the recalculated reading limits are:
Reading limits = 19.025kΩ±[(19.025kΩ × 0.06%) + 3Ω]
Reading limits = 19.025kΩ ± 14.4Ω
Reading limits = 19.0106kΩ to 19.0394kΩ
Restoring factory defaults
Before performing the verification procedures, restore the instrument to its factory front panel
(bench) defaults as follows:
1. Press MENU key. The instrument will display the following prompt:
MAIN MENU
SAVESETUP COMMUNICATION CAL ©
2. Select SAVESETUP, and then press ENTER. The unit then displays:
SETUP MENU
GLOBAL SOURCE-MEMORY
3. Select GLOBAL, then press ENTER. The unit displays:
GLOBAL SETUP MENU
SAVE RESTORE POWERON RESET
4. Select RESET, and then press ENTER. The unit displays:
RESET ORIGINAL DFLTS
BENCH GPIB
5. Select BENCH, then press ENTER to restore bench defaults.
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