There is manual mode «ручной режим» in E6-40 (lock at p2.3.12 of manual). In manual mode one measurement takes about 4 sec (it is depend from properties of test object). Displayed value of resistance smoothly converges to real value. You can estimate the rough value of resistance. If this value is much more than acceptable value you can finish the measurement.
For example, acceptable resistance of insulation is no fewer than 20 Mom. During the measurement the displayed value is 100Mom and it is growing up, If it is enough for you, you can note that insulation resistance is bigger than acceptable 20 Mom.
You can ask the question to our engineers about measuring instrument. The answer will be published in this website section, and additionally send to you by email