Simpson 260 Series 8 - Decibel Measurement Application; Direct Current Measurement: Overview; DC Current Measurement: 0-50μA Range

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c. Use operating instructions for AC VOLTAGE MEASUREMENT, 0-2.5/10/25/
50/250V RANGES (paragraph 4.10).
NOTE: Do not use the 500V or 1000V ranges for decibel readings.
d. Read decibels on the bottom scale marked dB. For the 10/25/50/250V ranges,
add the appropriate factor from the chart below:
NOTE: The maximum voltage ratio that can be measured is +50 dB on the 0-
250V range.
e. If dB measurements are being made to a 0.006 watt into 500 ohm reference
level, subtract +7 dB from the reading obtained on the 260.
4.15 Direct Current Measurement
a. Do not change the range setting of the range or function switches while the
circuit is energized.
b. Never disconnect test leads from the circuit under measurement while it is
energized.
c. Always turn the power off and discharge all the capacitors before the setting
of the switches is changed, or the leads disconnected.
d. Never exceed the circuit-to-ground voltage of the instrument (1000 v max.,
table 1-1, item 16).
d. Always connect the instrument in series with the grounded side of the circuit.
e. In all direct current measurements, make certain the power to the circuit
being tested has been turned off before connecting and disconnecting test
leads or restoring circuit continuity.
4.15.1 Direct Current Measurement 0-50µA Range
a. Set the function switch at +DC.
b. Plug the black test lead into the –COMMON jack and the red test lead into the
+50µAMPS/250mV jack.
c. Set the range switch at 50µAMPS (dual position with 50V).
d. Open the grounded side of the circuit in which the current is being measured.
Connect the VOM in series with the circuit. Connect the red test lead to the
positive side and the black test lead to the negative side.
e. Read the current on the black DC scale. Use the 0-50 figures to read directly
in microamperes.
NOTE: For polarity reversing see paragraph 4.2.
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