Q. Should I select Internal Gate Test or External Gate Test?

A. If you want a precise amount of Watthours to be applied to the the Unit Under Test, use of the Internal Gate Test can allow the Control Relay to be used to Switch potential to the load until a precise amount of Watthours has been applied.

If you want the Unit Under Test to control the amount of Watthours applied during the test, use should use the External Gate Test.

Q. For what Number of Counts (Nt) should I program into the  computer?

A. This is dependent upon the accuracy resolution that is desired.

Notes: Higher number of counts can provide higher accuracy and resolution but increases the duration of the test if the same input count rate is used.

Q. For how much Retrigger Delay should I program the computer?

A. This depends on the duration of contact bounce, if any, on the input count(s)/ pulse(s) to the computer. Note: The units for the Retrigger Delay times are in second(s). If the input count(s)/pulse(s) are from a bounce free solid state source the input can be set for a small number such as .0001 seconds. If the count(s)/pulse(s) are from a mechanical device the time could be much longer depending on the input units bounce time (example) .01 seconds if the bounce duration is 10 milliseconds. Note: If the Retrigger Delay is set for too long, some of the incoming count(s)/pulse(s) may be missed.

Q. Why does the display indicate that the Unit Under Test has approximately 50% Registration?

A. This is possibly if you are using ½ of a KYZ Output to provide the Count(s)/pulse(s) input to the computer. On form "C" (KYZ) outputs in which each transfer of the contact(s) represents one count the effective count(s)/pulse(s) applied to the computer is only ½ of the count(s)/pulse(s) being outputted by the Unit Under Test, since the computer is set up for form "A"type input. The solution is to program the computer with Kh value to 2 times the rated output per pulse of the unit under test.

Q. What does Ma mean in the computer programming sequence and to what value should it be set?

A. Ma represents the Watthours per pulse of the reference Standard being applied to Standard "A" Input of the computer. It should be programmed to match the watthour(s) per pulse of the reference Standard.

Q. Why do I get non-repeatable %Registration values?

A. Noise can be introduced through the optical pick-up. The optical pick-up connector should always be shorted when not being used. This is accomplished by connecting the optical pick-up plug with pins 1 and 2 shorted together into its socket on the side of the microjoule.