I assembled the Blue ESR meter and started to do the initial checks. The manual states to "Do not install the integrated circuits until after performing the Initial Checks". After downloading the following link and studying the information and schematic, I found that to do the "initial checks" as stated in the Blue ESR manual both IC2 & IC3 have to be installed in order to get the - LED to light on the left hand display. This is clarified by reading the old manual (see the link) on page 7 under initial checks (and is made clear by looking at the schematic). However, the initial checks for the old meter on page 7 show a current and voltage test without the IC chips and then if they are good to install the chips and check if the - LED lights on the left hand display.
Anyway, I decided to compare the two schematics and they are quite similar. Since I don't want to fry anything I want to ensure that everything is good before installing the two IC chips. Back on page 7 (initial checks) it says to short out the switch and check to make sure I get 6 mA current from the battery. I only get 3.9mA and not 6 mA. Is the new design still supposed to get 6mA, or does it draw less (with the chips out)?
I understand things a bit better after reading the information in the old manual. I would just like to know if the 3.9mA I am getting is going to be a problem or not. Does the blue meter draw the same current or does it only need about 4 mA? Note that I am using a good meter that does not load the circuit.
I would appreciate any help I can get.
Thanks
Anyway, I decided to compare the two schematics and they are quite similar. Since I don't want to fry anything I want to ensure that everything is good before installing the two IC chips. Back on page 7 (initial checks) it says to short out the switch and check to make sure I get 6 mA current from the battery. I only get 3.9mA and not 6 mA. Is the new design still supposed to get 6mA, or does it draw less (with the chips out)?
I understand things a bit better after reading the information in the old manual. I would just like to know if the 3.9mA I am getting is going to be a problem or not. Does the blue meter draw the same current or does it only need about 4 mA? Note that I am using a good meter that does not load the circuit.
I would appreciate any help I can get.
Thanks
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