AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 274)

Page 274 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Math Channel
In data analysis software, a channel calculated using raw data and mathematical functions. Can
be included in a plot with other data.
mS
Abbreviation for millisecond or one thousandth, 0.001 seconds.
Open Loop Fuel Control
Method of controlling fuel flow without modification from a feedback variable such as oxygen
content.
Outing
In data analysis software, refers to a complete set of data.
Parallel Circuit
Contains two or more circuit elements that have the same voltage measured across each.
Peak and Hold Driver
A driver that uses two levels of current to operate the injector. The driver circuit applies battery
voltage to the injector until a predetermined current level is reached. The current is then
reduced and held at a lower level for the duration of the PW. This type of driver is normally used
with injectors having low resistance coils (typically around 2 ohm). The accuracy of the driver
peak current level (Ip) and the hold current level (Ih) is held to ±0.50%.
Permanent Power
Sometimes referred to as "Perm" power. This is uninterrupted battery power. Typically a direct
connection to the battery positive terminal.
Pickup
Term that sometimes refers to frequency measurement sensors such as crank or cam position.
Pigtail
One or more wires terminated only on one end. Sometimes specialized automotive connectors
are supplied with a short piece of wire installed in each cavity. Can be spliced into an existing
harness.
Pinout
Refers to the description of each circuit or pin on a connector.
Power
Power is the rate at which work is done. It is the product of torque and angular speed.
psi
Abbreviation for pounds per square inch, a unit of pressure measurement.