Agilent Technologies Twelfth 4287A RF LCR Operation Manual page 258

Specifications and Supplemental Performance Characteristics
Basic Measurement Characteristics
At the following points, measurement error may exceed the specifications described here
due to the 4287A's spurious characteristics:
109.7 MHz, 153.6 MHz, 177.2 MHz, 256.0 MHz, 329.1 MHz, 460.8 MHz, 768.0 MHz
Examples of Calculated Impedance Measurement Accuracy
Oscillator Level ≥ −33 dBm, Averaging Factor ≥ 8, Temperature Deviation ≤ 5°C
Figure 12-1
258
Oscillator level < −33
dBm
± (100 + 0.15 × F) [μS] (F: Frequency [MHz])
Chapter 12