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Use this formula to determine the value of an external shunt resistor
(meter impedance >10 MΩ):
Where: Rs = Shunt resistance in MΩ
Rm = Voltmeter input impedance in ΜΩ (>10 MΩ)
Example: If Rm = 20 MΩ,
Use this formula to calculate a correction factor (meter impedance
<10 MΩ):
Where: Cf = Correction factor (multiplier for meter reading)
Rm = Voltmeter input impedance in MΩ
Example: If Rm = 1 MΩ,
A meter reading of 0.526 volts represents an input of:
0.526 x 1.901 = 1 or 1 kV
Circuit Loading
The probe represents a load to the circuit of 1000 MΩ , or 1 µA/1 kV.
Maintenance
The probe has no user-serviceable parts.
Use a soft cloth dampened with distilled water to clean the probe. Never
use solvents of abrasive cleaners. Make sure the probes are dry before
use.
Performance Test
Verify the accuracy of the probe with a 15 kV dc (±0.25 %) voltage source.
When used with a compatible dc voltmeter, the probe should measure the
source with ±1 % accuracy. No calibration adjustments are available on
the probe.
Rs
Rm x 10
Rm 10
=
−
Rs
20 10×
20 10–
-------------------
200
10
----------20 MΩ===
Cf
1.11 + Rm
1.11 x Rm
=
Cf
1.11 + 1
1.11 x 1
=
2.11
1.11
= 1.901=
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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