Rpm Measurements; Counter Measurements - Extech Instruments GX900 User Manual

RPM MEASUREMENTS
1. Set the rotary function switch to the RPM position.
2. Insert the black lead banana plug into the negative COM jack and the red test lead
banana plug into the positive V jack.
3. Touch the test probe tips to the circuit under test.
4. Read the RPM value on the display.
COUNTER MEASUREMENTS
1. Set the rotary function switch to the RPM position.
2. Press the F1 key (MENU), move the menu selector to the item labeled COUNTER,
and then press the OK key
3. Move the menu selector to the item labeled START and press the OK key
4. Insert the black test lead into the negative COM jack and the red test lead into the
positive V jack.
5. Touch the test probe tips to the circuit under test.
6. Read the Period value on the display.
7. To set the Count Threshold press the F1 key (MENU), move the menu selector to
the item labeled COUNTER, and press the OK key
8. Move the menu selector to the menu item labeled THRESHOLD and press the OK
key
9. Enter 1 or 2 or 3 using the arrow keys and then press the F1 key to save. Press the
F1 key to return to the measure screen.
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Extech Instruments
GX900-EU-EN V1.6 4/14