Fluke 5560A - Resistance Calibration

5560A/5550A/5540A
Service Manual
26
Resistance Calibration
The verification points for resistance are selected based on knowledge about the hardware and the
electronic circuits in the Product. The resistance section uses:
• Different measurement modes. For resistance up to and including 100 k
Ω the measurements are
performed in four-wire mode (4W). The rest of the measurements are performed in two-wire mode
(2W).
• Different measurement methods are used: Direct and Transfer from resistance standards
(whenever the TUR is low).
• Different resistance modes. Because of product compliance (Operating Characteristics) certain
steps require the Fluke Calibration 8588A to be used in Low Current Mode (LoI) to reduce the
current into the product.
For all resistance steps: Toggle the meter to the Volts dc function prior to putting the Product in operate
mode. Toggle the meter to the resistance function and range as instructed in the section below after
the product is in operate. Failure to follow this sequence results in compliance-limits error on the
Product.
Step
Product
Range
Product
Output
Shunt
Shunt_R
[Ω]
DMM
Reading
on Shunt
Output
[V]
Calculated
Product
Output
Limits
41 3.1 A 3.1 A Fluke A40B-5A ±0.894 mA
42 3.1 A -3.1 A Fluke A40B-5A ±0.894 mA
19 12 A 0 A Fluke 742A-1k
±0.250 mA
20 12 A -0.00001 A Fluke 742A-1k
±0.250 mA
39 12 A 1 A Fluke A40B-1A ±490 µA
40 12 A -1 A Fluke A40B-1A ±490 µA
43 12 A 10 A Fluke A40B-10A ±2.650 mA
44 12 A -10 A Fluke A40B-10A ± 2.650 mA
45 12 A 12 A Fluke A40B-20A ± 3.13 mA
46 12 A -12 A Fluke A40B-20A ± 3.13 mA
21 30.2 A 0 A Fluke 742A-1k ± 0.50 mA
22 30.2 A -0.0001 A Fluke 742A-1k ± 0.50 mA
47 30.2 A 12.1 A Fluke A40B-20A ± 10.2 mA
48 30.2 A -12.1 A Fluke A40B-20A ±10.2 mA
49 30.2 A 20 A Fluke A40B-20A ±16.5 mA
50 30.2 A -20 A Fluke A40B-20A ±16.5 mA
51 30.2 A 30 A Fluke A40B-50A ±24.5 mA
52 30.2 A -30 A Fluke A40B-50A ±24.5 mA
Table 7. Calibration Steps for Amps DC (cont.)