User Manual
12
2.4.2 Self-test Errors
Connect AC power cord to the AC receptacle in the rear panel and press the power switch to the ON position to turn
ON the instrument. Various elements of the system are checked during the power-on self test routine. If any occur, they
are reported during the power-up procedure. See Section 11 for troubleshooting and error information details. During
self-test, the display displays “System Init”, and dots are displayed showing the test progress level.
2.4.3 Input Check
Follow the steps below to check that the load is operating correctly, and that the load elements (power transistors) are
not damaged. A DC power supply rated for at least 5V and 1 A is required for this check.
1. Connect the input terminal to a DC power supply and congure the supply to output 5 V and current limit to 1 A.
2. Power on the load. The display will show the “OFF” annunciator above the voltage display.
3. Turn on the DC power supply’s output. Observe the load’s measured voltage display, it should read approximately 5
V.
4. Press the “CC” button to enable the constant current load mode.
5. Use the keypad to enter 0.5 A. Press the Enter key to set the value.
6. The display should show CC = 0.500A on the bottom right.
7. Press “On/O” to enable the load. The “On/O” button should light up, and the “O” indicator on screen should
disappear. The measured current should now display a value close to 0.5 A.
8. This setup veries that the load is drawing power correctly from the power supply.
If the load does not show 5 V, or shows signicant current draw from the connected power supply, the load may be
damaged and need service. If when the supply is connected, showing 5 V on the load’s display, and no current is drawn,
the load may be damaged and need service.
Note: If the load is not drawing power from the DC power supply, check all load protection limits and settings within
the menu to verify that the load is congured to allow drawing power at 5V, 0.500 A. Also, verify that the CC mode
parameters are setup to operate within the congured valid ranges by pressing +
If after checking all of the above, and verifying the power supply used for testing is not at fault, contact B&K for further
assistance.
2.4.4 Check Model and Firmware Version
The model and rmware version can be veried by using the *IDN? query remote command. It can also be found from
the front panel:
1. Press and
2. The display will show the following:
3. This shows the model to be a BK8542B with Firmware: 1.45
4. Press (esc) to return to the normal display.