1144A Active Probe
Calibration Testing Procedures
Equipment Required
The equipment required for the calibration tests is listed at the test. Any
equipment satisfying the critical specifications listed may be substituted for the
recommended model.
CAUTION Allow the probe to warm up for at least 15 minutes prior to beginning calibration
tests. Failure to allow warm-up may cause the probe to fail tests.
Input
Resistance
This test checks the input resistance of the active probe.
Specification 1.0 M& ?5%
Equipment Required
EquipmentCritical SpecificationRecommended
Model/Part
Digital MultimeterResistance ?1%34401A
1Connect the DMM between the probe tip and the ground shell at the
front of the probe.
2Set up the DMM to measure resistance.
The resistance should read 1.0 M& ?50 k& .
Gain
Accuracy
This test checks the gain accuracy of the probe
Specification 0.1 ?2% (into 50 & ?0.5%)
Equipment Required
EquipmentCritical SpecificationRecommended
Model/Part
Signal Generator 1 kHz and 1 Vrms3312A
Digital Multimeter Better than 0.1% accuracy at 1 kHz34401A
Power SupplyPower for probe under testOscilloscope or
1142A
Blocking cap0.18 mF (or 0.1 mF fixed capacitor)10240B
AdapterBNC(f)-to-probe (suppl?d with probe)5081-7705
AdapterN(f)-to-BNC(m)1250-0077
TerminationBNC feed-through, 50 & ?0.5%10100C (test to 0.5%)
AdapterBNC (f) to banana (m)1251-2277
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