Real Time Clock; Usb +5V Voltage; Power - Measurement Computing USB-5203 User Manual

USB-5203 User's Guide
Parameter
Logging stop methods
Logging status indication

Real time clock

Parameter
Battery backup
Accuracy

USB +5V voltage

Parameter
USB +5 V (VBUS) input voltage range

Power

Parameter
Connected to USB
Supply current
Supply current (Note 3)
+5 V output voltage range
(pins 21 and 47)
+5 V output current
(pins 21 and 47)
Isolation
AC Adapter Power Supply (used for data logging operation)
Output voltage
Output wattage
Specification
Stop on button press – To stop logging, press and hold the button until the LED turns off.
The device caches logged data in volatile memory prior to writing to memory card. When
logging, always use the button to stop logging and ensure data is written to memory card
prior to removing power.
The LED operations when connected to the AC adapter power supply are different than when
connected to USB.
Logging modes:
Logging Off mode: the LED is off (disabled).

Start Logging on Power Up mode: the LED turns on, but blinks off momentarily every

time data is captured.
Start Logging on Button mode: the LED is initially off. When the button is pressed

and held for approximately 1 second, the LED turns on and act the same as Start Logging
on Power Up mode.
Start Logging at Specified Time mode: the LED turns off, with a momentary on flash

every second until the specified date/time is reached. At that time, the LED turns on and
acts the same as Start Logging on Power Up mode.
Other indication:
To stop logging and store the remaining data to memory card, press and hold the button

until the LED turns off. It is then safe to remove the memory card.
If the memory card becomes full, the LED blinks rapidly (250 ms period).

If the memory card is removed while logging is in progress, the LED blinks rapidly

(250 ms period). Inserting a memory card stops the LED from blinking.
Table 15. Real time clock specifications
Specification
CR-2032 lithium coin cell, replaceable
±1 minute per month
Table 16. USB +5 V voltage specifications
Specification
4.75 V min to 5.25 V max
Table 17. Power specifications
Conditions
USB enumeration
Continuous mode
Connected to a self-powered hub. (Note 4)
Connected to a self-powered hub. (Note 4)
Measurement system to PC
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Specifications
Specification
<100 mA
500 mA max
4.75 V min to
5.25 V max
10 mA max
500 VDC min
5 V ±5%
2.5W