User Manual

5-3. Line Frequency Measurements

Use of the attenuator, low pass filter, and/or x10 probe is advisable when

measuring line frequency because the high amplitude signal and noise can

cause wrong counting.

WARNING

USE CAUTION IN MEASURING THE LINE FREQUENCY OF AN AC OUTLET.

USING THE PROBE TIP ONLY, MEASURE BOTH SIDES OF THE LINE. THE

GROUND SIDE WILL GIVE A ZERO READING AND THE HOT SIDE WILL

PROVIDE THE DESIRED MEASUREMENT. DO NOT USE THE "GROUND

"LEAD OF THE PROBE. REMEMBER THAT THE CHASSIS OF THE

COUNTER AND THE “GROUND” LEAD OF THE PROBE ARE ALREADY AT

EARTH GROUND (VIA THE 3-WIRE POWER CORD OF THE INSTRUMENT).

TOUCHING THE

“GROUND "LEAD TO THE 'HOT" SIDE OF THE LINE WOULD PLACE A

DIRECT SHORT ON THE POWER LINE THROUGH THE PROBE CABLE,

RESULTING IN POSSIBLE INJURY AND DAMAGE TO THE PROBE CABLE.