Verification Limits - Keithley 3700 series Reference Manual

Series 3700 System Switch/Multimeter Reference Manual
NOTE
Manufacturer
Fluke
Fluke
HP
Agilent
N.A.
N.A.
N.A.

Verification limits

The verification limits stated in this section have been calculated using only the Series 3700
one-year accuracy specifications, and they do not include test equipment uncertainty. If a
particular measurement falls outside the allowable range, recalculate new limits based both on
the Series 3700 specifications and corresponding test equipment specifications.
Example reading limit calculation
The following is an example of how reading limits have been calculated. Assume you are testing
the 10V DC range using a 10V input value. Using the Series 3700 one-year accuracy
specification for 10V DC of ± (25ppm of reading + 2ppm of range), the calculated limits are:
Calculating resistance reading limits
Resistance reading limits must be recalculated based on the actual calibration resistance values
supplied by the equipment manufacturer. Calculations are performed in the same manner as
shown in the preceding example using the actual calibration resistance values instead of the
nominal values in the example when performing your calculations.
Document Number: 3700S-901-01 Rev. A / August 2007
The Keithley Instruments Model 3706-190 backplane connector board is an accessory
that can be used to make connections to the calibrator. Additional boards, such as a
four wire short or the discrete resistors, would also be convenient to eliminate rewiring
for different setups used in verification.
Model
5700
5725
3458
33220A
N.A.
n/a
n/a
Reading limits = 10V ± [(10V × 25ppm) + (10V × 2ppm)]
Reading limits = 10V ± (0.00025 + 0.00002)
Reading limits = 10V ± 0.00027V
Reading limits = 9.99973V to 10.00027V
Description Used for:
All DCV, ACV, DCI, ACI,
Calibrator and resistance
Amplifier High voltage, high current
DMM 10µA, 100µA DCI range
Function generator Frequency
4 wire short DCV, resistance zeroes
1 Ohm discrete
resistor
1 Ohm range
10 Ohm discrete
resistor 10 Ohm range
Section 10: Verification
Uncertainty
N.A.
N.A.
N.A.
N.A.
N.A.
+/- 20ppm
+/- 20ppm
10-3