The CalCard Instrument Verification
Periodic calibration verifies an instrument’s accuracy at a given time, but maintaining accuracy between calibrations is crucial.
The CalCard offers electricians a practical tool to check high insulation and low continuity resistance measurements, ensuring consistent reliability during electrical testing.
Innovative Test & Measurement Product of the Year
Overall Innovative Product of the Year
Measurement Verification
for Electrical Test Instruments.
Periodic Calibration guarantees the instrument’s accuracy and serviceability at that time. But maintaining measurement accuracy and testing reliability between calibrations is equally critical for dependable results.
The CalCard acts as a practical reference to help electricians verify that the instrument continues to read high isolation resistances and low continuity resistances correctly, emphasising your responsibility to confirm and maintain testing accuracy between calibration periods.
Qualified electricians rely on the CalCard to confirm the instrument’s accuracy during Continuity and Insulation measurements, reinforcing their role in ensuring reliable testing during electrical installation verification.
The CalCard is a valuable and important tool for all competent electricians.
Typical Uses for CalCard.
As an electrician conducting tests and inspections of installations, you will be testing all the circuits in the high-Ohm range for isolation verification and the low-Ohm range for continuity.
Either measurement, because it is at the extreme upper or lower end of the scale, can sometimes cause you to doubt the results of some installation tests.
- Is that really an open circuit I am measuring, or just very high resistance?
- Is that an absolute short I am reading, or a very low resistance?
Either way, you can use your CalCard to check your instrument’s reference measurements at these high and low limits.
Thus, providing confirmation and reassurance that the measurement is being performed on an accurate, serviceable instrument.
Features and Benefits of CalCard
Contact Plates/Pads
Unique to CalCards the contact pads provide a universal probe contact.
‣ No need to remove probe tips.
‣ Verifies and tests the complete instrument.
Dependability
Recessed contact pads comprise three layers: –
Top Layer
Gold
Maintains consistent measurement and protects against corrosion and tarnishing
Middle Layer Nickel
Prevents the hard points of the probe from penetrating and breaking the pads
Bottom Layer
Copper
For connectivity to the surface mount resistors
Strong and Waterproof
Comprised of laminated layers on a multi-layered glass fibre base.
‣ Very strong and tough for the professional tradesperson.
‣ Hermetically sealed to match the working environments
5 Continuity Tests
Five of the most useful resistance values for continuity, all measure against the two common points
5 Insulation/Isolation Tests
Five of the most useful resistance values for high Ohm measurements of Insulation, all measure against the two common points
CalCard Reference Base Measurements
On receiving the CalCard measure and record all 10 Insulation and Continuity values with a freshly calibrated instrument. On the rear of the CalCard, there is a space to record the “Base Reference” measurements.
Part of the CalCard design includes a protective cover that makes these reference records both indelible and permanent records for the lifetime of the CalCard. A simple guide to this process is detailed below.
The CalCard is used as a reference, not a calibrated source. Therefore, you must measure and record these base reference values using your meter.
The difference between the stated and measured resistance is due to the resistors’ manufacturing tolerance, which results in variation from the stated value. Hence the term “Reference Base Value”
With Insulation measurements, a 500 V high-voltage source applied to the CalCard will yield different readings due to the high voltage propagation within the assembly and the resistor. This design feature indicates that any change in the applied voltage will be reflected in measurements, thereby indicating an instrument fault.
Periodically, you can test and validate your meter by measuring and confirming its readings against the recorded base values. Any significant drift will indicate a possible instrument failure.
Peal Protective Cover Off
Stick Down Protective Cover
Permanent & Indelible Sealed Record
