HP LCR METER
The 4261A meter measures the resistance, capacitance or inductance of components. It applies signals at 120Hz and 1KHz, treating the attached device as an series or parallel equivalent circuit. It measures resistances from 100mΩ to 10MΩ, capacitance from 10pF to 10mF, and inductances from 10 μH to 1000H.
In addition it measures the dissipation (energy loss due to phase angle) for inductance and capacitance. The meter steps through ranges and in auto mode will even switch between series and parallel equivalent measurements for the device.
QUICK INSPECTION
The device was a bit dirty but seemed in good shape otherwise. It had been powered on by the seller so I did the same and tried some measurements. The results were reasonable and the device appeared to be mostly working okay.
I will perform all the tests and adjustments using the manual, after which I will determine whether there are any defects I have to find and fix. I ordered high precision capacitors, resistors and inductors for the testing.
TESTING POWER SUPPLIES
The power supply was slightly off, but after adjustment all was correct with power.
SELF TEST CHECKS
The device has two self tests that can be performed by sliding a switch on the inside to either test 1 or test 2 positions. I ran both tests.
Test 1 will step the device through all its ranges, displaying a count of 1888 with proper decimal point positioning and a dissipation reading of 000. I saw a few ranges where it displayed 'out of range' instead of 1888, but the manual indicates that this is the expected result.
Test 2 will display measured values of 1000 as it steps through all ranges, with some tests using shorted input terminals and others using open terminals. A few ranges were 'out of range' but that was also to be expected.
I will run calibration and adjust this meter once my reference parts arrive, which will give me a very useful tool when I am repairing devices.
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