OTDR Series e-Manual, D07-00-076P-RevC00 Page 61 of 107
To calibrate the Loss meter to the LS:
1. Connect the LS the OPM using a short patch cord.
2. Tap the Reference button to record the 0dB point. A reference point is established and the
calibrated LS can be connected to the far-end of the fiber to measure the loss.
• Hold: Freezes the last power or loss reading on the screen. Hold appears on the white
screen when tapped. Tap Hold again to unfreeze it.
• Save: Records instantaneous power or loss readings in the Results tab. The Save
button must be used to record these individual readings (e.g. same cable at different
wavelength). Use the Folder button to save the complete set of results.
Saving the power or loss readings is useful when measuring multiple
fibers or testing one fiber with multiple wavelengths.
• Reference (Reference Power Level for Loss Meter Test Mode): Sets the output
reference level to measure against when a short and clean optical patch cord for the LS
is connected directly to the unit’s OPM port.
Press Set to store the reading or press Cancel to keep the previously stored value.
6.11.1.2 Setting Pass/Fail Limits
Whether measuring optical power or loss, there are always power input limits (saturation and
loss) or attenuation allowances that determine whether the fiber cable meets the requirements
for the desired application or network elements.
• Power Limits: Select the Power Limits (dBm) checkbox and enter the Minimum and
Maximum power levels allowed for the application (e.g. in line with the transceiver’s
dynamic range). If the power reading falls beyond those limits, the power measurement
reading will turn red.
• Loss Limits: Select the Loss Limits checkbox and enter the Minimum and Maximum
amounts of optical power loss that are acceptable for the application or specified for the
cable or installation. You can specify the total amount of attenuation in dB, or select the
dB/km or dB/mi if the results are being compared against cable specifications. If
needed, enter the Length of the cable under test for the test set to make the
conversion.
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