Fluke 5320A User Manual

Operator Maintenance
Verifying Calibrator Operation 6
6-7
2. Verify the Calibrator’s Low Resistance calibration performance at each resistance
point listed in Table 6-4. Deviations should not exceed the specified limits.
High Resistance Source Verification
1. Connect the high resistance source output to a standard megaohmmeter’s input
terminals. Set the appropriate parameters on the megaohmmeter to meet its best
accuracy. Do not exceed the maximum permitted test voltage.
2. Verify the Calibrator’s High Resistance calibration performance at each resistance
point listed in Table 6-5. Deviations should not exceed the specified limits.
Note
For some megohmmeters, when using the Calibrator’s 100 G
N value or
when using the resistance multiplier adapter, the leads must be swapped
between the calibrator’s HI and LO ohms resistance output. The ground
must be turned on (GDN ON) when swapping HI and LO lead positions in
the high ohms resistance function. For example, to make a proper
measurement with the Quadtech 1865 megohmmeter, connect the HI
terminal on the megohmmeter to the LO terminal on the Calibrator and
connect the LO terminal on the megohmmeter to the HI terminal on the
calibrator. Turn the ground on and proceed to make the measurement.
Ground Bond (and Loop/Line Impedance) Resistance Source Verification
Verification using a standard ohmmeter with test current of 100 mA is adequate for
ground bond decade verification.
1. Connect ground bond/loop/line resistance source output to a standard multimeter
using a 4-wire connection. Set the Multimeter to make a 4-wire ohms measurement.
2. Verify the Calibrator’s Ground Bond Resistance calibration performance at each
resistance point listed in Table 6-6. Deviations should not exceed the specified limits.
As an additional verification test, it is recommended to verify test points in Table 6-7
using a higher test current. The Fluke 5520A (or similar calibrator) can be used to
source the dc test current. The connection diagram shown in Figure 6-1 is used to
perform the verification points in Table 6-7 for test current up to 10 A.
3. Set test current in the calibrator according to Table 6-7 and measure voltage drop
between 5320A PE and N terminals (V
t
).
4. Calculate ground bond resistance:
R
gbr
= V
t
/I
t
(N)
5. Compare calculated value R
gbr
with calibration value on the 5320A display.

Fluke 5320A Specifications

General

Brand	Fluke
Model	5320A
Category	Test Equipment
Language	English