Fluke NetDAQ 2640A, Service Manual

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NetDAQ
Service Manual
4-14
5. Close Spy Window To close the Spy window, double-click the upper left-hand
corner control-menu box.
Two-Terminal Resistance Accuracy Test (2645A) 4-15.
Complete the following procedure to test the accuracy of the resistance function for the
2645A using two terminals. Measurement accuracy applies to all channels, not just the
channel used for the test. (The four-terminal resistance accuracy test is more rigorous
and you may wish to skip this step and continue to "Four-Terminal Resistance Accuracy
Test.")
1. Connect the Resistance Source to Channel 1 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. 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.
2. Configure Channel 1 for Ohms In NetDAQ Logger for Windows, configure
channel 1 for Ohms-2T, 30k range.
3. Open Spy Window Select the Spy command from the Utilities menu. Select
channel 0101 (instrument 01, channel 01) from the Channel list. 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
30 k
Ω
Short Circuit (Zero) 700
Ω
1 k
Ω
30 k
Ω
29 k
Ω
29.681 k
Ω
30.019 k
Ω
300 k
Ω
290 k
Ω
289.07 k
Ω
292.63 k
Ω
3 M
Ω
2.9 M
Ω
2.8607 M
Ω
2.9410 M
Ω
* The resistance accuracy in this table makes allowance for up to 0.05 ohm of lead wire
resistance plus 0.01% decade resistance tolerance. You must add any additional lead wire
resistance present in your setup to the resistance values given in this table.
Resistance Range* 5700A Minimum Reading Maximum Reading
30 k
Ω
Short Circuit (Zero) 700
Ω
1 k
Ω
30 k
Ω
19 k
Ω
19.686 k
Ω
20.014 k
Ω
300 k
Ω
190 k
Ω
189.60 k
Ω
192.10 k
Ω
3 M
Ω
1.9 M
Ω
1.8740 M
Ω
1.9277 M
Ω
* The resistance accuracy in this table makes allowance for up to 0.05 ohm of lead wire
resistance. You must add any additional lead wire resistance present in your setup to the
resistance values given in this table.
5. Close Spy Window To close the Spy window, double-click the upper left-hand
corner control-menu box.