ASTM D6425 Friction and Wear Properties of Extreme Pressure (EP) Lubricating Oils
ASTM D6425 Standard Test Method for Measuring Friction and Wear Properties of Extreme Pressure (EP) Lubricating Oils Using SRV Test Machine
8. Preparation of Apparatus
8.1 Turn on the test machine and chart recorder and allow to warm up for 15 min prior to running tests.

8.2 Select the friction data to be presented in the crest peak value position in accordance with the manufacturer's directions.

NOTE 7 - In most cases, this is accomplished by positioning the sliding switch on electronic card No. 291.35.20E (front side of electronics behind front panel) and the sliding switch located on the back panel of the control unit.

8.3 Turn the amplitude knob to ZERO.

8.4 Switch the stroke adjustment to AUTO position.

8.5 Set the frequency to 50 Hz and duration to 2 h, 00 min, 30 s in accordance with the manufacturer's instructions.

8.6 Set the load charge amplifier to the setting that corresponds to 300 N in accordance with the manufacturer's instructions.

NOTE 8 - In later SRV models, the load charge amplifier is set automatically.

8.7 Set the desired span, and calibrate the chart recorder in accordance with the manufacturer's instructions. Select the desired chart speed.