Fluke 5790B, Руководство по обслуживанию

Страница: 50 / 172

5790B
Service Manual
3-12
DC Calibration Adjustment
Table 3-3 lists the equipment required for dc calibration adjustment of the main
input. Proceed as follows to perform dc calibration of the main input, which is
always the prerequisite for ac calibration adjustment. Use the 5730A you
characterized in the previous procedure as the dc source.
Table 3-3. Equipment Required for Main Input DC Calibration
Equipment Manufacturer and Model
Multifunction Calibrator Fluke Calibration 5730A*
50

Type “N” Coaxial Tee Male-Male-Male Amphenol 4850 or equivalent
50

Type “N” Female to Double Banana Plug
Adapter
Pomona Model 1740 or Equivalent
Binding Posts to 50

Type “N” Male Adapter Pomona Model 1796 or Equivalent
Low-Thermal Test Leads Fluke 5440B-7002 or equivalent (two sets)
*: The 5730A must be characterized for dc using the procedure in this section.
1. Set up the equipment as shown in Figure 3-5. A shielded twisted pair is
recommended for the 5730A SENSE leads.
Note
Thermal emf errors can adversely affect ac-dc transfers used in the
subsequent procedures. To minimize thermal emf errors, use low
thermal emf cables and connectors and avoid changing the
temperature of any connection during a procedure. It typically takes
five minutes to thermally stabilize a connection after it has been
touched.