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6
Measuring Inductance See Figure -10-
1. Set the Function Switch to mH or H.
2. If RANGE is displayed, press the RANGE button to enable autoranging.
3. Connect the Test Leads: Red to H mA, Black to COM
4. Turn off power to the circuit being measured.
5. Free at least one end of the inductor from the circuit.
6. Connect the Test Probes across the inductor.
7. Read the display.
Measuring Frequency See Figure -11-
1. Set the Function Switch to Hz.
2. If % is displayed, press the yellow button to display Hz.
3. If RANGE is displayed, press the RANGE button to enable autoranging.
4. Connect the Test Leads: Red to Hz, Black to COM
5. Connect the Test Probes to the signal source.
6. Read the display.
Measuring Dutycycle See Figure -12-
1. Set the Function Switch to %.
2. If Hz is displayed, press the yellow button to display %.
3. Connect the Test Leads: Red to %, Black to COM
4. Connect the Test Probes to the signal source.
5. Read the display.
Measuring dBm See Figure -13-
The 37XR-A measures dBm relative to 1 mW referenced to 50 :. That is,
10 dBm = 10 mW, 0 dBm = 1 mW, -10 dBm = 0.1 mW, etc.
1. Set the Function Switch to dBm.
2. Press the yellow button. The display shows dBm to verify the selection.
3. Connect the Test Leads: Red to , Black to COM
4. Connect the Test Probes to the signal source.
5. Read the display.
Testing Logic Levels See Figure -14-
The 37XR-A tests logic levels for both TTL and CMOS logic. The meter displays 9
plus a
for a high-level (true) condition. The meter beeps and displays an 9and
a
for a low-level (false) condition. See Specifications for the logic 1 and logic 0
voltage limits. Out-of-limits indications are dispalyed as 9 only, no
or beep
occur.
1. Set the Function Switch to LOGIC
2. Press the TTL CMOS button to display the selected type.
3. Connect the Test Leads: Red to , Black to COM
4. Connect the black lead to logic common.
5. Connect the red lead to the logic test point.
6. Read the display.
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