Using The Shunt Input For Relative Current - Fluke 5790B/3 Operator's Manual

2. Press the [WBND] key and set the range as desired.
3. Set the source to a voltage under 7V, 1 kHz.
4. Press the "Set Ref" softkey to store a reference.
5. Vary the source from 10 Hz to 30 MHz while recording the amplitude error relative
to the stored 1 kHz reference. The error can be displayed in ppm, percent, voltage, or
ratio as the input frequency is swept through its range.
You can use the same technique to check frequency flatness with the main
input.

4-25. Using the Shunt Input for Relative Current

To measure relative (not absolute) current, you have two choices: Accessory 5790A-7001
allows you to connect Fluke A40 or A40A Current Shunts to the 5790A SHUNT input
for making current transfers up to 20A. Accessory 792A-7004 allows you to connect
Fluke A40 Current Shunt to the INPUT 1 Type "N" connector for making current
transfers up to 5A. Instruction sheets are supplied with each type of current shunt adapter.
The 5790A Shunt Input is internally terminated with a 90 resistor that allows for direct
connection to current shunts. Connection to A40 and A40A Current Shunts requires the
5790A-7001 accessory which consists of an adapter and cable. The cable is
approximately 36 inches long and has a male banana plug on one end and a UHF(M)
connector on the other. This cable connects between the 5790A Shunt Input and either
the A40A Current Shunt or the adapter (see Figure 4-3). The adapter has a UHF(F)
connector on one end and one-inch spaced female banana plugs on the other. This one-
inch spacing allows for connection to the A40 Current Shunt.
Figure 4-3. Measuring Relative Current Using 5790A-7001
The 792A-7004 Adapter can also be used with the 5790A. This adapter has two
functions. First, it consists of a type N connector on one end and one-inch spaced banana
plugs on the other end which enables direct connection between the A40 and the 5790A
Input. Second, it has an internal 90Ω resistor to "simulate" the thermal transfer standard.
In this application, the 792A-7004 Adapter is connected to Input 1 of the 5790A. Figure
4-4 shows how the 792A-7004 Adapter can be used with Input 1 of the 5790A for
AC/DC current transfers. (The A40A Current Shunts have UHF type connectors.
Therefore, an A45-4004 Output Cable is also required.)
Note
Front Panel Operation
Instructions for Transfer Mode
f4-3s.bmp
4
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