HT Instruments HT7051 Manual De Instrucciones página 53

5.4 INSULATION MEASUREMENT IN RAMP MODE
This function is performed in compliance with standard IEC/ EN61557-2. The RAMP mode
allows choosing among three different types of ramps:
RAMP#1
For each type of ramp, it is possible to set the duration, the test voltage and the number of
times the ramp is repeated (§ 5.4.1, § 5.4.2, § 5.4.3).
Voltage starts from 0V, reaches the value V1 in a time interval T, keeps the
RAMP#1:
value V1 for a time T1, and finally returns to 0 (with possible discharge of the
residual voltage).
RAMP#2: Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a
time interval T, and finally returns to 0 (with possible discharge of the
residual voltage).
RAMP#3: Voltage starts from 0V, which is kept for a time T0, reaches the value V1 in a
time interval T, keeps to value V1 for a time T1, and finally returns to 0 (with
possible discharge of the residual voltage).
• The instrument may be used on installations of overvoltage category CAT
IV 600V to earth with maximum voltage 600V between inputs. Do not
connect the instrument to installations with voltages exceeding the limit
values indicated in this manual. If these limit values are exceeded, the
operator may be exposed to electrical shocks and the instrument could get
damaged
• Always connect the measuring leads to the instrument and to the alligator
clips with the accessories disconnected from the system
• It is recommended to hold the alligator clip respecting the safety area
marked by the hand protection (see § 4.4)
1. Turn on the instrument by press the ON/OFF/
2. Press the FUNC key to select the RAMP function.
RAMP#2 RAMP#3
Fig. 6: Instrument connection
CAUTION
key
EN - 17
HT7051 - HT7051N