5322A
Operators Manual
34
In 4-wire mode, the Product can insert a pair of fixed auxiliary resistors to the LO
ohm - and LO-ohm Sense HI terminals as shown in Figure 3. One of a pair of
auxiliary resistor values can be chosen: 500 Ω, 1 kΩ, 2 kΩ, 5 kΩ, or SHORT.
When SHORT is selected no resistor is inserted. Use this feature to check the
effect of actual cable resistance on the performance of earth ground resistance
testers.
Note
Before you adjust the value, make sure the current generated by the
DUT does not exceed the maximum allowed value
With the output connected, you can adjust the resistance value with the
keyboard, cursor keys or rotary knob. Any new values set with the front panel
take approximately 500 ms to show on the output terminals. Should the set value
exceed the upper range limit or lower range limit, the Product shows Value too
Large or Value too Small, respectively.
To change between 2-wire and 4-wire operation:
1. Push the Mode softkey.
2. With the cursor keys or rotary knob, move the cursor to Resistance 2-Wire
or Resistance 4-Wire and either push the Select softkey or push in the
rotary knob.
2-Wire or 4-Wire shows next to the resistance value in the OUTPUT area of
the display.
To select the 10 mΩ single value:
1. Push the Mode softkey.
2. Use the cursor keys or rotary knob to move the cursor to 10 mOhm and push
the Select softkey or push in the rotary knob.
4-Wire calibration value of the 10 mOhm segment in main field is displayed.
To switch between grounded and ungrounded (floating) output:
1. Push the Setup softkey.
2. With the cursor keys or rotary knob, highlight Low resistance source and
either push the Select softkey or push in the rotary knob.
3. With the cursor keys or rotary knob, highlight Low resistance source GND
and either push the Select softkey or push in the rotary knob.
4. With the cursor keys or rotary knob, highlight either GND On or GND Off and
either push the Select softkey or push in the rotary knob.
5. Push the EXIT softkey repeatedly to return to the main display.
In 2-wire mode, low Resistance Source function has a test lead resistance
compensation feature. The lead resistance can be saved into 5322A memory.
The Product then automatically compensates the resistance by adding the test
lead series resistance to the output value that is shown. The lowest-adjustable
resistance value of the Low resistance source cannot be lower than the stored
lead resist
a
nce. The range of lead compensation is from 0 Ω to 2.000 Ω.
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