5700A/5720A Series II
Operators Manual
4-16
4-22. Four-Wire Vs
.
Two-Wire Resistance Connections
Figure 4-4 shows four different ways to connect to a UUT for resistance calibration.
Figure 4-4A shows a UUT with four-wire sensing. For such meters, you should always
take advantage of the four-wire sensing capability and use external sensing to achieve the
highest accuracy. (Four-wire sensing is available for all resistance values except
100 MΩ.)
For calibrating a meter with only a two-wire resistance mode such as a typical handheld
DMM, refer to Figures 4-4B through 4-4D. For resistances of 19 kΩ or lower in two-wire
mode, compensation circuitry inside the calibrator is available to remove errors
introduced by resistance in the path between the front panel terminals and the precision
resistor. Depending on how you connect the meter, you can use two-wire compensation
referenced at the UUT terminals (Figure 4-4C) or at the ends of the UUT's test leads
(Figure 4-4D). See “Resistance Output” for information on turning on and off two-wire
compensation circuitry.
Figure 4-4B shows a meter connected in a two-wire connection with the two-wire
compensation circuitry turned off. For low resistances where uncompensated lead
resistances are significant, use the two-wire compensation circuit and the connection in
Figure 4-4C or 4-4D. Use the connection in Figure 4-4C if you want to calibrate the
meter referenced at its terminals. Use the connection in Figure 4-4D if you want to
calibrate the meter referenced at the end of its test leads.
4-23. Cable Connection Instructions
To connect the calibrator to a UUT, proceed as follows:
1. If the calibrator is turned on, press r, or 0 V E. Either action sets the
calibrator to 0 mV in standby.
2. Determine the appropriate figure from Table 4-2, and refer to the preceding text and
Table 4-1 to make appropriate connections to the UUT.
Table 4-2. UUT Connection Figures
5700A/5720A Series II Output Figure
DC Voltage (including 5725A boost 4-1
AC voltage ≤10 kHz 4-1
AC voltage >10 kHz 4-2
AC current ≤2A, ≤10 kHz 4-3
Resistance 4-4
Wideband AC voltage (option 5700A-03) 4-5
5725A amplified output (current only) 4-6