
4. Internal Battery Pack
Inside the ILT5000 is a .7V 4400mAh rechargeable Lithium-Ion battery pack. A full charge is obtained in
approximately 12 - 14 hours, with a new fully charged battery pack lasting a minimum of 12 hours.
NOTE: The battery pack in the ILT5000 is expected to last for many years. (greater than 00 charge
cycles) Battery packs should only be changed by trained personnel. Changing of the battery pack by non-
ILT personnel voids the warranty and can cause damage to the pc board.
5. Low Level Current Measurement
The ILT5000 can measure as low at 10 femtoamps (and up to 1 milliamp) of current. The following are
guidelines for best results when measuring very low signals:
•Use the “User Dark” (aka “Zero”) function of the various DataLight software offerings to ensure the
unit is properly zeroed in the same environment where measurements will be taken.
•Make use of the DataLight software “Noise Reduction” and “Sample Time” features to provide
additional over-sampling
•Allow extended settling time for extremely low signals (<10pA)
NOTE: The ILT5000 has a built in shielding cage to stabilize the high gain circuit during measurements,
however environmental factors can still be a source of error when measuring these extremely low
signals. ILT recommends using quality shielded cables and allowing for extended test time durations.
Additional shielding of the sensor and meter housing may also be needed depending on the
measurement environment and current level under test.
6. Saturation
The ILT5000 provides an autorange mechanism allowing it to measure from 10 femptoamps to 1 milliamp of
current. While autoranging or using the various fixed current ranges (settable via the various DataLight
software offerings), the ILT5000 can experience saturation. When the ILT circuit becomes saturated, the
ILT5000 saturation LED will illuminate with a steady red output. ILT “D” type sensors have been designed to
assure a safe current value is supplied to the ILT5000. All non ILT sensors should be connected via the SMA
connector.
7. everse Bias
The ILT5000 can supply 5V or 0V through the D-sub or SMA connector on the front panel. This bias voltage is
often used to supply the necessary voltage to sensors containing PMT's, Vacuum Phototubes. The 5V bias is
also used on silicon sensors to increase the response time. (I.E. the SED0 and SED100 silicon sensors are
often biased when used for flash measurements.)
NOTE:
Sensors can be damaged if inadvertently biased. For example the ILT SED005 (GaAsp), SED62 , SED624
and SED625 (thermopiles) should not be supplied with 5V bias.
8. esponse time:
The ILT5000 is capable of sampling as fast as 20 micro seconds and recording measurements as fast as 100
readings per second (100 Hz) when saving data to the internal memory. Depending on the application that is
running, user programmed settings and light levels the response times will vary.
9. Flash: The ILT5000 can take a measurement as fast as 20 microseconds and the internal capacitors
can store a charge at an even faster, allowing the ILT5000 to take not only integrated flash
measurements but to also plot the rise and intensity of flashes using our Datalight III software.
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