Filter
Top Products
Maintenance
Performance Test
6
6-23
4-Wire Resistance Accuracy Test (2645A) 6-20.
Ensure that the Accuracy Tests (above) have been completed before performing
this test on the 2645A.
1. Connect the Resistance Source to Channels 1 and 11 Remove the
Universal Input Module from the instrument and connect a cable from the
Decade Resistance Source to the Universal Input Module terminals for
channel 1 (Sense) and channel 11 (Source) as shown in Figure 6-4. Reinstall
the Universal Input Module. You may also use the 5700A resistance
calibration output instead of the Decade Resistance Source. Tables are
provided for both connections. Refer to Figure 6-5 for the 5700A 4-wire
connections.
2. Configure Channel 1 for Resistance In NetDAQ Logger, configure channel
1 for Ohms-4W, 300 range. (See “Configuring Analog Channel Functions" in
Chapter 3 of this manual.)
3. Open Spy Window Select the Spy command from the Utilities menu. Select
analog channel 01. Click OK to open the Spy window.
4. Verify Accuracy Configure the Decade Resistance Source for the output
values below and verify the Spy window measurement is between the
minimum and maximum values. Change the channel 1 range as required (see
Step 2).
Resistance Range Decade Resistor Minimum Reading Maximum Reading
300Ω Short Circuit (Zero) 0Ω 0.1Ω
300Ω 290Ω 289.81Ω 290.19Ω
3 kΩ Short Circuit (Zero) 0Ω 1.0Ω
3 kΩ 2.9 kΩ 2.8981 kΩ 2.9019 kΩ
30 κΩ 29 kΩ 28.981 kΩ 29.019 kΩ
300 κΩ 290 kΩ 288.37 kΩ 291.63 kΩ
3 MΩ 2.9 MΩ 2.8600 MΩ 2.9400 MΩ
The resistance accuracy in this table makes allowance for up to 0.01% decade resistance
tolerance.