Amps Measurements 4-3
Step 2 Perform zero correction
To achieve optimum accuracy for low current measurements, it is recommended that you zero
correct the electrometer. To do so, select the 20pA range (which is the lowest range) and press
the ZCOR key until the “ZZ” message is displayed. See Section 2 for details on zero correction.
Step 3 Select a manual measurement range or enable auto range
Use the RANGE and keys to select a manual measurement range, or press AUTO to
enable auto range. With auto range enabled, the instrument will automatically go to the most
sensitive range to make the measurement. See Section 6 for details on range.
Step 4 Connect the current to be measured to the electrometer
Basic connections for amps measurements are shown in Figure 4-1.
NOTE Fundamental information on making connections to the electrometer input is pro-
vided in Section 2 (“Connection Fundamentals”).
WARNING A safety shield is required whenever a hazardous voltage (>30V) is present
on the noise shield. This can occur when the test circuit is floated above
earth ground at a hazardous voltage level (see “Floating Measurements” in
Section 2). Connections for the safety shield are shown in Figure 4-1. The
metal safety shield must completely surround the noise shield or foating test
circuit, and it must be connected to safety earth ground using #18 AWG or
larger wire.
NOTE High-impedance current measurements require special measurement techniques.
These connection techniques are covered in “High-Impedance Measurement Tech-
niques” (located in this section).
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