Price $949CAN
(Inventory Status: In-Stock)
(All orders subject to $30CAN Shipping & Handling for US/Canada, Other Zones Inquire)
Contact info@sistemi.ca to order or to find out more.
Download PC GUI Client (v0.16.34)
Windows
Ubuntu/Linux
Mac OS Mx/x86
DOES NOT USE FET Switching architecture
If you have tried other current measurement devices you may have seen "artefacts" in the measurement. All other current measurement equipment use multiple shunt resistors and FETs to select which shunt resistor to use based on the magnitude of the current. Switching between FETs is susceptible to charge injection from the Gate-Source capacitance of the FET. That charge injection causes artefacts in the measurement. There is no way to fix that. FET switching architectures must also have an algorithm that must "predict" the current in order to switch the FET(s) into the right range. Some current profiles can cause such algorithms to "thrash" between ranges.
Allows standard BNC Cables to be used for Auxiliary Inputs D0/1 & A0.
$49 plus applicable taxes and shipping & handling.
1 AWG14 Standard Probe
1 AWG18 Light Current (<500mA) Probe
More flexible than the AWG14 standard probe
1 Terminal Connect Block
$49 plus applicable taxes and shipping & handling.
(Note: If you search for "CCTV Power cables" you will find several sources of these cables and then can make your own.)
2 Locking AUX Probe harnesses
$49 plus applicable taxes and shipping & handling.
Note:
You can make your own locking harness with these part numbers, Molex 50-57-9704 & 16-02-0069, ZipWires Zw-FF-20
You don't need to use a locking harness, ZipWires can be directly used, as included in the original kit.
P1150 GitHub repo P1150 Scripting
Download PC CLI Client (v0.4.21)
The Command Line Interface (CLI) client can be used for automated testing with scripts and other lab bench frameworks.
The CLI can be used with frameworks that can spawn a process to the host OS.
Use argument "--help" for CLI usage.
Windows
Ubuntu/Linux
The P1150 is self calibrating. However, if you need externally traceable Calibration validation then this procedure can be used by a certified 3rd party.
Procedure Here
Although the EXE is signed, it is signed with the lowest kind of certificate which was the least expensive at the time I bought it. Windows pops up a dialogue asking the user to trust this app. Apparently, over time, Windows observes that the P1150 GUI is trusted by a growing number of users and will trust the application.
I need to buy the "EV" level of certificate to avoid this headache.
Internal to the P1150 there are 10 resistive loads, 2M, 200K, 20K, 2K, 400, 200, 100, 40, 20, 10 Ohms. During calibration these loads are used to create an expected current. From that expected current, offset and gain correction is computed. The resistors that are used in calibration are 0.1%. The ones that are not are 1%.
In addition the Output Voltage is also calibrated with a dedicated high precision 16bit ADC.
Calibration is done when the device connects to the PC.
Calibration can be repeated using Menu->Calibrate.
From a cold start at room temperature the P1150 raises in ~15DegC temperature. Although I haven't seen much temperature change, you may want to re-calibrate once the P1150 gets up to running temperature. The P1150 temperature is displayed in the GUI.
The P1150 is a low source resistance power supply. If the DUT pulls high current, the P1150 will attempt to deliver that current. A common DUT design architecture is to have an LDO power a subsection, and enable/disable that LDO for battery current saving. That circuit subsection, powered by the LDO, may have large decoupling caps, that LDO will attempt to power up those caps. At time zero, the current into a cap is "infinite". This is called "in-rush" current.
When a real battery is used, it cannot deliver "infinite" current, because a battery is a chemical process, and has significant source resistance.
The P1150, being a low source resistance power supply will show you the "in-rush" current problem you didn't know you had.
In-rush current(s) are notorious for causing "random" resets in your DUT. Especially when the battery is low in capacity, cold, or "aged", or all of the above. With the P1150 Aux A0 input you can monitor critical power supply rails and see the brown out that in-rush currents can cause. Many microcontrollers have a "brown-out" detector on their VCC supply and will reset. Some microcontrollers, like the STM32 series, have a reset reason register that you can check on boot.
How to fix in-rush currents? Ideally its a hardware change, to use an LDO (or SMPS) with a "soft-start" capability. Often a hardware change is not available. One thing you can try is to "PWM" the enable signal of the LDO (or SMPS). By toggling the enable pin at ever increasing duty cycle, you are "charging" up those decoupling caps slowly. The P1150 has helped many designers tune the toggling of the enable pin.
