You should do a test to make certain that you get the expected results with this generator.
You need to know if it is shielded well enough and if the common mode currents will be small enough so as not to interfere with the desired results.
You can make this check by hooking it to a radio and then turning on all attenuation switches for maxiumum attenuation.
There should be no discernable signal present; If there is it could interfere with the expected results.
It appears that the generator has a least 96 db attenuation in the attenuator; That should be enough to be well below the sensitvity capabilities of the radio.
If you can hear the modulated carrier from the generator then that means the generator is not shielded well enough for this purpose or it has common mode currents on the cable between the generator and the radio.
You can eliminate the common mode currents with the appropiate ferrite core.
If it passes the test then you won't need to do anything else but establish -67 dbm signal level with the proper combination of the attenuator switches and the FINE ATTENUATOR control.
With all attenuation off (all ATTENUATOR switches in the "OUT" position) and the "SET LEVEL" established (meter pointer to the red 0 on the top scale of the meter ) with the FINE ATTENUATOR control, the ouput is supposed to be 100 millivolts, which is -7dbm.
To achieve the level of -67 dbm you will need to add 60 db of attenuation; Take 3 of the 20 db switches and move them to the "IN" position.
(You have just added 60 db of attenuation to the already level of -7dbm for a total of -67 dbm; Which is right on target)
If the generator is shielded well enough and the common mode currents are low enough this will give you a fairly accurate signal level.
The following is from the operators manual:
SETTING THE SIGNAL LEVEL
1. Be sure the output is terminated in a 50 ohm load.
2. Set the MODULATION switch (15) to the CW position.
3. Set the METER switch (2) to the CARRIER position.
4. Determine the amount of attenuation required to produce the desire output level .
The desire output leve may be in millivolts, microvolts, or db, but must be converted to db to correspond witht the labelling on the controls.
In this unit 0 db = 100 millivolts into a 50 ohm load.
5. Place as many ATTENUATOR selectors (10) in the position as required to come with within 0 to +5 db of the desire total attenuation.
All the other ATTENUATOR selectors (10) must be in the OUT position.
6. Set the FINE ATTENUATOR control (9) for the additional attenuation, as indicated on the meter (3) (this should always be in the 0 to -5 db region of the meter scal).
The total of all ATTENUATOR selectors and the meter reading equals the total attenuation below the 0 db (100 millivolt) reference level.
NOTE:
A. For greater accuracy, use an unmodulated signal level (MODULATION switch in CW position).
B. If the output is not terminated in 50 ohms, the output level is not calibrated.
However, the meter and ATTENUATOR selectors still provide indication of relatviley higher or lower level.
