The Frequency Accuracy Is Within A Deviation Of 50hz; If The Frequency Meter Function Displays Half Frequency Or Multiple Frequency, The Most Likely Damage Is The 8-Pin Model Is 1507 The Output Signal Strength Of The V Segment Is Equivalent To Hp8921a; If You Find That There Is No Signal Output In The Small Comprehensive Test, You Can Enter: 001.0000 In The Signal Source Mode. Use The Spectrum To See If There Are Signals At The 498m And 499m Frequencies. If There Is No Output, You Can Only Send Return For Repair. The Output Signal Strength Of The U Segment Is 4dbm That Of The Hp8921a (When The Weak Signal Is Output, For Example, When This Instrument Displays -125dbm, The Actual Value Is -121dbm), And When The Strong Signal Is Output, It Is The Same As The Hp8921a (For Example, When It Is Around -90dbm); When The Test Power Exceeds 5w, Please Shorten The Test Time Appropriately And Avoid Long-Term Testing At High Power, Because The Heat Sink Inside Is Limited In Size To Avoid Overheating. The Audio Modulation Degree Of The Signal Output Is 3k; The Power Meter Is Equivalent To Hp8921a When It Is Above 0.2w. When It Is Less Than 0.2w, The Displayed Value Is About 20% Larger Than The Actual Value (Probably Due To Rounding).-Tone System In The Signal Output Is 0.5k; The Minimum Power Input Required For The Frequency Meter Function Is 1mw (External Antenna, 1w Walkie-Talkie Can Be Measured At Close Range) Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use FM radio comprehensive tester (RF signal source function, power meter function, frequency meter function, sub-tone measurement function) Emission measurement Frequency measurement 10MHz~900MHz resolution 1KHz or 0.1KHz Power measurement 0.1W ~ 64W (the higher the power, please shorten the test time to avoid overheating) Sub-audio frequency measurement: 50Hz~260Hz analog sub-audio and standard digital sub-audio Receiving measurement RF signal generator 1MHz--470MHz Output level: -132dBm to -90dBm Monotone modulation: 1KHz 2KHz 3KHz optional, output modulation degree: 3K Sub-tone output: 50Hz---260Hz analog sub-tone and standard digital sub-tone, output amplitude: 0.5K Repeater station test Specially developed for debugging and measuring V repeaters and FM walkie-talkies. The signal generator can work in duplex mode. Even if the machine under test is placed in the transmitting state, it will not affect the operation of the generator. It can be used for measurement in the repeater forwarding state. Working voltage: 8-12V DC (direct current) Working current: 200mA It comes with no power supply, no test line, and no paper instructions. Please refer to the website for specific operation methods. Overall dimensions: approximately 160x160x65mm (including protruding parts) Colour:As Shown Material:Metal Package Contents: 1 x Intercom Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.