Fluke 1653B - Page 35

1652C/1653B/1654B
Calibration Manual
26
Complete the steps in Table 5 as follows:
1. Connect the test leads to the UUT, Decade R Box, and 5320A, as shown in Figure 7.
2. Set the Decade R value for 18 Ω.
3. Set the UUT rotary switch to LOOP Z
I
NO TRIP function.
4. Using the UUT < select L-PE.
5. On the 5320A select 
.
6. Using the 5320A Mode softkey, select Loop.
7. Using the 5320A Setup softkey, select Loop Impedance and then select
Loop imp. correction and COMP.
8. Using the 5320A cursor keys or keypad, set the 5320A Nominal R Value for 25 mΩ
(approximate).
9. Record the 5320A Displayed OUTPUT impedance value for Step 1 of Table 5.
10. Using the UUT Accuracy Spec. and the Recorded 5320A Displayed Output
impedance value + Decade R Value, calculate the Upper and Lower UUT display
limits for Step 1 with the formula that follows:
(18 + Recorded 5320A Displayed OUTPUT Z Value) ±
{[(18 + Recorded 5320A
Displayed OUTPUT Z Value) x 3%] + 0.06}
11. Set the Decade R value for the next step value.
12. Put the 5320A in OPER and wait to settle.
13. Press and release  and note the UUT display reading.
14. Compare the UUT display reading to the Upper and Lower limits in Table 5.
15. Repeat steps 10 thru 13, above, for the remaining steps of Table 5.
16. Set the 5320A  and disconnect the Decade R Box from the UUT and 5320A.
Table 5. LOOP Z
I
NO TRIP Accuracy Tests
UUT
Display Limits
Step
UUT
Function
UUT <
Setting
Decade
R Box
Setting
5320A
Residual
Impedance
Correction
Type
Recorded
5320A
Displayed
OUTPUT Z
Value
UUT Accuracy
Spec.
±
(% + dig)
UUT
Res.
Lower Upper
1 18 Ω ±(3 % +6) 0.01
2 180 Ω N/A ±3 % 0.1 174.6 185.4
3
LOOP Z
I
NO TRIP
L-PE
1800 Ω
COMP
N/A ±6 % 1 1692 1908