Voted Best Answer
May 29, 2018 - 07:55 AM
The small size of the jaw may not be able to clamp around large battery cable or when there are multiple battery cables. If the battery has multpile ground cable extending from the terminal you must be able to encase all of those cables inside the jaw of the clamp. Additionally, the 07-60 is only accruate reading up to 60 amps to current. Typically, most starters will draw 100-200 amps when cranking.
The 10:1 attenuator will not give the amp clamp addition range, it is only used to give the scope the ability to display a wider range. For Example, if the 07-60 low current amp clamp is inputing 600mV, that is converted to 60 Amps on the uScope's preset. The 10:1 attenuator would lower that voltage to 60mV (600 / 10 = 60) , and the uScope preset would now convert that to 6 Amps based on the voltage it now see. The current clamp is still only reading 60 amps. It will not allow the 60 Amp probe to read 600 Amps. The best choice for performing a relative compressor test would be a high current amp probe, such as the 07-600 or pt-TA167. These clamps have a larger jaw to accomodate large battery cables. They are also accurate for the necessary range of relative compression testing.